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  • 151. Amadei, Bernard
    et al.
    Stephansson, Ove
    Luleå tekniska universitet.
    Rock stress and its measurements1997 (ed. 1)Book (Other academic)
  • 152. Ames, Alicia
    et al.
    Mateo-Babiano, Iderlina B.
    Susilo, Yusak O.
    KTH, School of Architecture and the Built Environment (ABE), Transport Science, Transport planning, economics and engineering.
    Transport Workers' Perspective on Indigenous Transport and Climate Change Adaptation2014In: Transportation Research Record, ISSN 0361-1981, E-ISSN 2169-4052, no 2451, p. 1-9Article in journal (Refereed)
    Abstract [en]

    This paper explores the potential role of indigenous transport for increasing the adaptive capacity of selected cities in developing Asia. Indigenous transport drivers were surveyed face-to-face in Bandung, Indonesia, and in Ho Chi Minh City, Vietnam, to gain an understanding of how transport workers, specifically drivers-operators, characterize transport modes considered as indigenous and perceive their potential role in increasing the adaptive capacity of these cities. The main finding was that indigenous transport modes in the two cities in the case study had evolved to fit a niche market influenced by differing urban scales and divergent demographic and geographic characteristics. Thus, the experiences and the perceptions of transport workers on indigenous transport were highly contextualized in relation to service and route characteristics. Operating conditions for drivers were indicative of the regulatory status of indigenous transport modes in the informal landscape. This analysis contributes to an increased understanding of the role and the operation of indigenous transport modes within the transport system. The analysis also contributes policy-relevant insights to improve an understanding of the potential role of indigenous transport in climate change adaptation, as well as to increase awareness and to anticipate a shift to a more environmentally sustainable transport mode.

  • 153.
    Anand, Adarsh
    et al.
    Department of Operational Research, University of Delhi.
    Agarwal, Mohini
    University of Delhi.
    Bansal, Gunjan
    Department of Operational Research, University of Delhi.
    Garmabaki, Amir
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Operation, Maintenance and Acoustics.
    Studying product diffusion based on market coverage2016In: Journal of Marketing Analytics, ISSN 2050-3326, Vol. 4, no 4, p. 135-146, article id 5Article in journal (Refereed)
    Abstract [en]

    Market coverage is an important attribute for determining the success of a product. The larger the market covered by a product is, the higher the amount of sales for that product will be. Market coverage strategies thus contribute to the success of a product in tapping the market. In this study, we emphasize the impact of market coverage on the rate of adoption in determining product sales. New product diffusion models based on the market covered are proposed. A methodological approach of weighted criteria is implemented to evaluate and rank the proposed models. The analysis is conducted on real-life sales datasets

  • 154.
    Anderson, Anne Lee
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering.
    Assessment of thermal radiation arithmetic's for jet flames: A study involving generic calculation methods concerning radiation from jet flames with the purpose to determine the safety distance for flame effects2018Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Jet flames are commonly used as flame effects in pyrotechnical shows, and are also a possible risk in industries that uses pressurised flammable gas. For these users it is important to  make fire safety engineering calculations to minimise the risks. This project focus on jet flames that are used in pyrotechnic shows where, e.g. it is important to determine the safety distance to the audience. Up to now most studies made concerning jet flames regards jet flames in subsonic regiments, whilst there is a lack of studies concerning sonic jet flames and mathematical formulations for radiation from these cases are limited. This makes pre-determination of temperatures, safety distances, flame heights etc. a challenge. Based on information found, and assumptions when needed, calculations of the safety distance were made. 

  • 155.
    Andersson, Alexandra
    Mälardalen University, School of Sustainable Development of Society and Technology.
    Green Building: Ett företags energieffektiviseringsarbete i ett byggprojekt samt de krav som ställs för att få byggnaden Green Building klassad.2009Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    The examination has been performed at Bjerking AB, which is an architectural and engineering company. Bjerking AB has the ambition to be a member of Green Building.

    The Green Building program developed in year 2005 by The European Commission, the program is an environmental system with the aim to improving energy efficiency within the sectors of non-residential buildings. The minimum requirements to participate the program are following: in new-built buildings the calculated energy consumption must be 25 % lower than the requirements in the BBR (Building regulations) and in refurbishment the reduction must be 25 % lower than before the optimization.

    The aim of this study has been to examine and review the company Bjerking AB's energy efficiency work in the project of building the school/kindergarten S:ta Maria Alsike, where the goal is to get this building Green Building classed. A description of requirements to become a member of the Green Building has also accomplished in the thesis.

    The methods performed in this study are literature review, searches on the Internet, studies on the project database for facts/values, calculation of energy consumption and interviews of members of the Green Building. 

    The following issues have been dealt with in the report;

    -          Did the building in the project manage the requirement to achieve an   energy consumption that is 25% lower than the requirements in BBR?

    -          What technical measures/system was selected in the building?

    -          What kind of cooperation was the project based on?

    -          What is required for consultancy companies and real estate owners to become members of the Green Building?

    The study of the project and calculation of estimated energy consumption in the building, give the result 47 kWh/m2, year. This is 60 % lower than the requirements of BBR. The Green Building requirement is that the building's energy consumption should be at least 25% less than the requirements in BBR. The building fulfills this requirement by a significant margin. It can therefore be concluded that the technical solutions carried out in the building are energy efficient. The project consisted of the cooperation shape “partnering ", which can be assumed to be a good form of cooperation in order to achieve an energy efficient building. The consultancy company Bjerking AB and the landlord Knivsta Pastorat has the potential to become members of Green Building, as Green Building Endorser respective Green Building Partner.

    Keywords: energy efficiency, requirements of BBR, technical systems, cooperation, consultancy companies, real estate owners, estimated energy consumption, partnering, Green Building Partner, Green Building Endorser.

  • 156.
    Andersson, Andreas
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Design and Bridges.
    Gamla Årstabron, FEM-beräkning av förstärkningsåtgärders inverkan på betongbågarna2006Report (Other academic)
  • 157.
    Andersson, Andreas
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Design and Bridges (name changed 20110630).
    Gamla Årstabron, FEM-beräkningar av 3-ledsbågarnas verkningssätt och inverkan på förstärkningsåtgärder2007Report (Other academic)
    Abstract [sv]

    Denna rapport redovisar brottgränsberäkningar av gamla Årstabrons 3-ledsbågar. Beräkningarna är till stor del utförda med FEM och är gjorda på liknande sätt som tidigare rapport avseende nolledsbågarna.

  • 158.
    Andersson, Andreas
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Design and Bridges.
    Gamla Årstabron, Sammanställning av beräkningar avseende förstärkningar av betongbågarna2007Report (Other academic)
  • 159.
    Andersson, Andreas
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Design and Bridges.
    Sundquist, Håkan
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Design and Bridges.
    Gamla Årstabron, Utvärdering av verkningssätt hos betongvalv genom mätning och FEM-modellering – Etapp 12005Report (Other academic)
  • 160.
    Andersson, Andreas
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Design and Bridges.
    Sundquist, Håkan
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Design and Bridges.
    Utvärdering av krafter i Älvsborgsbron genom dynamisk mätning och analys2006Report (Other academic)
    Abstract [sv]

    Föreliggande rapport behandlar mätning och analys av krafter i Älvsborgsbron i Göteborgsom underlag för klassningsberäkning. Den metod som används för bestämning av krafternaär den s.k. vibrationsmetoden där konstruktionselement sätts i svängning och dessas egenfrekvenserbestäms med hjälp av accelerometrar. Med kända egenfrekvenser för t.ex. kablaroch hängare kan krafterna i dessa analyseras fram. Eftersom flera av de aktuella elementenhar egenskaper som inte är enkla att beskriva med hjälp av faktorer som geometriska mått,massa, styvhet och inspänningsförhållanden, har möda lagts ner på att använda så noggrannametoder som möjligt för att kunna bestämma krafter och kraftfördelning. Metoderna beskrivsi rapporten och resultat och noggrannhet diskuteras och bedöms.De resultat som presenteras beträffande krafter bedöms ha en så god noggrannhet som det f.n.går att analysera fram med idag kända någorlunda enkla metoder.

  • 161.
    Andersson, Andreas
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Design and Bridges.
    Sundquist, Håkan
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Design and Bridges.
    Karoumi, Raid
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Design and Bridges.
    Evaluating cable forces in cable supported bridges using ambient vibration method2006In: The International Conference on Bridge Engineering – Challenges in the 21st Century , November 1-3, 2006, Hong Kong, Hong Kong, 2006Conference paper (Other academic)
    Abstract [en]

    This paper deals with the assessment of cable forces in existing cable supported bridges using the ambient vibration method. A case study of the Älvsborg suspension bridge in Sweden is presented. Dynamic measurements of the backstays and hangers as well as on each strand in one of the splay chambers have been carried out. The measured frequencies are evaluated and calculations of corresponding axial force in the cable structures are performed taking into account the cable sag, boundary conditions and flexural rigidity. Modal analyses have been used to study the shape of vibration and for comparison with finite element models.

  • 162.
    Andersson, Anna
    et al.
    Mälardalen University, School of Business, Society and Engineering.
    Carlson, Eva-Sara
    Mälardalen University, School of Business, Society and Engineering.
    Structures in underground facilities: Analysis of a Concrete Column’s Capacity to Withstand Extraordinary Fire Loads2012Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    The report present a Master of Science in engineering work carried out at Mälardalen’s University, made this work within the research project METRO. The work is a part of the research project METRO. The focus of the METRO project is on the protection of underground rail mass transport systems e.g. tunnels and subways stations. The aim with this work was to determine if a concrete column placed close to the tracks at a subway station can withstand the effect and temperature of a fire in a burning train comparable to the effects and temperatures that showed at the full scale test carried out within the METRO project. A literature review was made previous to the following case study. The results from this show that the column is negligible affected by the fire.

  • 163.
    Andersson, Elin
    et al.
    University West, Department of Engineering Science.
    Ahl, Viktoria
    University West, Department of Engineering Science.
    Täktverksamhet: En undersökning av beslut om avgifter och nedsättning2012Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Syftet med studien var att utreda huruvida det råder en konsekvent hantering av tillsynsavgifter och ifall beslut om nedsättning tas på lika grunder. Tanken var att rapporten skulle kunna påvisa om verkligheten avspeglar lagstiftningen.

    Grunden till denna studie är frågeställningarna;

    1. Hur beslutar tillsynsmyndigheter om tillsynsavgifter?

    2. I vilken utsträckning beviljar tillsynsmyndigheter nedsättning av tillsynsavgiften?

    3. I vilken utsträckning begär verksamhetsutövare nedsättning av tillsynsavgiften?

    Begreppet täkt definieras som arbetsföretag vilket primärt syftar till att nyttiggöra det uttagna materialet. Detta sker antingen genom direktförsäljning eller i övrig verksamhet inom det egna företaget. Arbetet handlar endast om tillståndspliktiga täkter och i Sverige finns det omkring 2300 sådana igång. Tillsynsavgiften för täkterna ligger på omkring 800 kronor per timme och i snitt läggs det enligt våra intervjuer tio timmar tillsynstid per täkt och år. Det sammanlagda beloppet på tillsynskostnader i Sverige ligger således på drygt arton miljoner kronor.

    Arbetet inleds med en teoridel där läsaren ges möjlighet att få en djupare förståelse för täkter, tillsynsavgifter, nedsättning och de lagrum som skall följas i samband med detta. Teorin grundas på litteraturstudier och samtal med sakkunniga. Följt av teorin kommer en undersökning som valdes att utföras genom intervjuer med ett visst antal kommuner, Länsstyrelser och verksamhetsutövare. Sammanställningen av intervjuerna blev grunden för det avslutande resultatet och de slutsatser som kunde tas av undersökningen.

    Resultatet av arbetet visar på att tillsynsmyndigheter fattar beslut om tillsynsavgifter och nedsättning på olika sätt och grunder. För att få en mer likvärdig hantering av frågorna skulle en tydligare och mer konkret lagstiftning behöva arbetas fram. Vi kunde också fastslå att Naturvårdsverket som har en tillsynsvägledande roll i sammanhanget inte verkar nå ut till de tillsynsansvariga då de flesta av dem inte vet om att Naturvårdverket tillhandahåller detta stöd. Det är många frågor som väcks efter att ha fullbordat denna studie och listan på förslag till framtida arbete kan därmed göras lång

  • 164.
    Andersson, Esmeralda
    KTH, School of Architecture and the Built Environment (ABE), Urban Planning and Environment, Urban and Regional Studies.
    Flytande städer: Att bygga städer och stadsdelar på vatten2018Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The population growth and climate change are two main factors in today’s urban planning. Approximately 71 % of the Earth’s surface is consisting of water and a large part of that is not being utilized to the fullest extent. Today’s buildings that entirely floats on water is something that we have already begun to see, however there is a low quantity of them. The following question is whether important issues connected to urban planning could be solved by expanding the amount of floating constructions, and thereby begin to use water as a place for cities and city districts to take form.

     

    The purpose of this study is to present the concept of floating cities and to discuss whether it could be an alternative for future planning and urbanization in Sweden. 

     

    By doing a literature study and a case study that are both supplemented by interviews, information will be obtained to use as a foundation for an analysis and discussion where conclusions will be made. The history of floating construction is described together with existing techniques and prerequisites that enable floating structures. Laws relevant to the subject is also described, for example the law of shoreline protection, which plays a major role when it comes to exploiting water areas. The cases in the study consist of both Swedish and international examples of projects that involve floating constructions. Main focus will be on Marinstaden in Nacka and Ijburg in Amsterdam. To complete the study and get a better overview, interviews are held with Alexander Erixson, planning architect at Nacka Municipality, and with Richard Bergström, CEO of AquaVilla AB.

     

    The conclusion is that it is possible to expand the number of floating districts in Sweden. Urban development would be positively influenced when opportunities are created, and issues as housing shortage could be solved. It could as well work as a prevention for environmental issues. The main problem that could occur is that floating districts might create segregation, although advocates states that well planned urbanization and support from laws and legalizations could make it possible to exploit water areas with floating buildings without the problem of segregation emerging. The challenge is to convince the society that the advantages outweigh the disadvantages. By that we achieve acceptance from more people which is a presumption when it comes to trying to accomplish a development and expansion of floating constructions in Sweden. 

  • 165.
    Andersson, G.
    Luleå tekniska universitet.
    Creep experiments on powder1983In: Scandinavian journal of metallurgy, ISSN 0371-0459, E-ISSN 1600-0692, Vol. 12, no 6, p. 312-314Article in journal (Refereed)
    Abstract [en]

    The change in strain during constant loading in die, isostatic and triaxial compaction has been studied for tungsten carbide powder. The creep effect change is largest for isostatic loose powder compaction whereas the slightly precompacted specimens (20 MPa) show less strain change. The creep effect gives modest contributions to the total strain for reasonable times. The highest pressure at which the effect has been recorded is 200 MPa

  • 166.
    Andersson, Hanna
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Business Administration.
    Tillförlitlig försörjningskedja: En fallstudie på Saabs projektprocess2013Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
  • 167.
    Andersson, Ina
    Blekinge Institute of Technology, Faculty of Engineering, Department of Spatial Planning.
    Garden cities of today: En applicering av Garden cities-idealet i en nutida svensk kontext2016Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Detta arbete undersöker vad som kan sägas utgöra kärnan i Garden cities-idealet utifrån Ebenezer Howards definition och Johan Rådbergs tolkning av Howard. Vidare undersöker arbetet hur idealet kan tolkas, förstås och appliceras i en nutida svensk kontext. De gestaltningsprinciper som kan sägas vara bärande för idealet används som utgångspunkt för utformandet av en illustrationsplan över Varvsstaden i Malmö. Därmed exemplifieras hur idealet kan förstås konkret i planeringssammanhang och vilka effekter som följer på ett genomförande av idealet i en central stadsdel i en storstad.

    För den teoretiska delen av arbetet används en innehållsanalys och de gestaltningsprinciper som utläses som bärande för Garden cities-idealet skisseras sedan fram i syfte att skapa "visuella verktyg" för den illustrationsplan som arbetas fram.

    Arbetet visar att det är fullt möjligt att utforma en central stadsdel i enlighet med Garden cities-idealet och uppnå ett relativt högt exploateringstal som resultat.  

  • 168.
    Andersson, Joel
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering.
    Hagberg, Ludvig
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering.
    Stability Analysis of High Concrete Dams: Longtan Dam - a case study2018Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
  • 169.
    Andersson, Johanna
    et al.
    Jönköping University, School of Engineering, JTH, Civil Engineering.
    Simu, Malin
    Jönköping University, School of Engineering, JTH, Civil Engineering.
    Underhåll av levande väggar: Möjligheter och utmaningar i ett svenskt urbant klimat2016Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Purpose: A slow development of living walls in Sweden is partly due to lack of experience and knowledge in the construction industry. Former studies point at challenges of adapting the technique in a Swedish climate and the importance of planning, knowledge and cooperation for the maintenance. The objective of the study is to analyse a sustainable maintenance by technique and maintenance planning of the system living walls in order to answer these challenges.  

    Method: The study is based on a qualitative approach where the methods are document analysis, interview and observation. Document analysis gives a status report of the implemented living walls in Sweden and introduces strategies for maintenance planning. Interview with relevant participants contributes with experiences concerning technique, maintenance and maintenance planning. Observation confirms the information about the technique.

    Findings: The study shows that none of the observed solutions can be considered completely sustainable, though they do have some sustainable qualities. Living walls have strong social and ecological benefits, where the vegetation contributes to increase ecosystem services in urban environment. A less use of resources is necessary for a sustainable technique where the use of stormwater, local resistant plants, lasting construction and recycled components promotes a sustainable environment and economy. The felt system is simpler in its design while the modular system is more flexible. A common objective among the observed projects is to create a maintenance-free solution as possible. Acceptance for resting plants during winter can lower the demands of the maintenance. Technical monitoring facilitates the maintenance but the manual handling of living walls is crucial. The frequency of the maintenance varies from each project where the client’s choice, placement of the wall, type of solution, size, plant choice and season affect. Therefore, it is important with planning and constantly evaluating a walls needs. The majority of the observed projects do not have a maintenance plan but the study shows success by a common objective, site analysis, goal-oriented maintenance plan and experience feedback.

    Implications: The conclusion of the study is that the technique of living walls needs to be evolved to leave a smaller footprint on the environment and the economy. The development is towards a maintenance-free solution but the manual handling can not be replaced by advanced technique. Every projects individual conditions demands thorough planning and continuous evaluation of the wall.

    Limitations: The study discuss living walls in the Swedish urban climate, where the result is based on experiences from projects developed in the southern part of Sweden. Other geographical placement causes different conditions for technique and maintenance. General assumptions can be made concerning the maintenance planning. More interviews with maintenance staff can contribute with other aspects to the analysis.

  • 170.
    Andersson, Jonas
    et al.
    University West, Department of Engineering Science, Division of Mathematics, Computer and Surveying Engineering.
    Thyrsson, Alicia
    University West, Department of Engineering Science, Division of Mathematics, Computer and Surveying Engineering.
    Marklov för trädfällning & skogsplantering: Kravets omfattning och utbredning2018Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    In community planning, there are many regulations that can be made to control land use and a detail development plan is an instrument that Sweden's municipalities have access to in order to do so. In a detail development plan, the municipality may specify properties that will apply in an area, such as the protection of trees, whish this study is about. To protect trees a plan regulation is required in the plan indicating what is applicable. In the Planning and Building Act 9 chap. 12 § it is stated that the municipality in a detail development plan may decide that a land permit is required for felling trees and for afforestation. An application for a permit to felling trees and / or afforestation shall be sent to the municipality, which will examine whether the application is to be granted or refused. Entering a land permit for felling trees in the detail development plan protects trees that may otherwise be cut down without the municipality's knowledge.

    The survey aims at examining the extent to which the municipalities of Sweden use the opportunity to decide on land permits in a detail development plan. Furthermore, the municipality's motive for the protection of trees is investigated and if it is done otherwise than with the plan regulation, and whether there has been any change in how the municipalities regulate trees in 2017 compared to 1990, when the detail development plan had recently been introduced. This has been done with both qualitative and quantitative methods to get a versatile and complete study.

    The results show that the municipalities used the plan regulation for land permit for felling trees in 60 of the detail development plans in 2017. To ensure protection of trees municipalities use other methods than land permit, for example a Plan regulation to protect trees. The motives given by the municipalities to protect trees vary widely and there are ecological, social and aesthetic reasons. In the comparison of detail development plans from 2017 and 1990, differences have been observed. More plans in 2017 with land permit for felling trees have been observed as well as more and more varied motivations. Plan regulation about afforestation has been found only once in a total of 1 353 detail development plans.

  • 171.
    Andersson, Lena
    Luleå tekniska universitet.
    Resource constrained mine project scheduling using critical path method1992Doctoral thesis, monograph (Other academic)
  • 172.
    Andersson, Linda
    et al.
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management, Land management, GIS.
    Hedlund, Johanna
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management, Land management, GIS.
    Trivsam boendemiljö för studenter: En gestaltningsstudie utifrån studenters åsikter för ett trivsamt boende2016Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The physical environment is a very important component for human health.  A well-functioning site enables people to recreation and social life. People who spend a lot of time outdoor are also experiencing less stress. If people doesn’t give opportunity to influence the spatial planning process there is a risk of negative attitudes and discomfort. This can create a mental illness. This study deals with how students feel about their physical environment and how they want it to be designed. The study is aimed at students who live in one of the three different student areas in Gävle: Kungsbäck, Campus Sätra and Midgård. The study is based on three methods. These were: a questionnaire, an observation study, and a physical design study in 3D.

     

    The observations showed significant problems with the site design as only movement, who take into necessary but significant activity account. The observations showed a clear lack of both elective and social activities, both of which are important for a well-functioning place. The survey showed dissatisfaction about the site design among the students. Through this study, students were given an opportunity to share their wishes about the site's future design. The proposals were designed in 3D. Three different proposals were developed: a zero option, an economical option, and an expensive option. The zero option indicates a probable development of the area if no action takes place. The economical option indicates a solution that focus on economical sustainability. The expensive option has the highest costs both in construction and maintenance. The evaluation showed that the students liked the economical proposal option most.

     

    The result showed the importance of student participation in the planning process. Student comments through the survey and evaluation, indicated that: trees, venues, water, grass and lighting should be included in future planning frameworks for student housing.

  • 173.
    Andersson, Lovisa
    KTH, School of Architecture and the Built Environment (ABE), Urban Planning and Environment, Urban and Regional Studies.
    Analys av Skiftingehus skolgårds fysiska miljö ur ett trygghetsperspektiv2017Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
  • 174.
    Andersson, Lovisa
    KTH, School of Architecture and the Built Environment (ABE), Urban Planning and Environment, Urban and Regional Studies.
    Planera för barn i förtätad stad: En studie av hur barnvänliga utemiljöer för skolor och förskolor kan skapas i samband med stadsförtätning i Eskilstuna kommun2017Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    As a result of a growing population and negative climate impact, today’s planning trend in Sweden is going towards densification which means that cities are being developed by concentrating new buildings on already exploited land. Even though densification is linked to sustainability this strategy has resulted in the exclusion of significant places for children’s outdoor play, such as school and preschool playgrounds. At the same time, children are a quite powerless social group that constitute the future of society and thus knowledge of their perspectives is necessary in urban planning. Therefore, the purpose of this study is to contribute to an increased understanding of how the child perspective, the perception of a child’s best, can be applied in relation to densification of the city in the municipal community planning. In the study the child perspective is defined by examining how a municipality can create child-friendly school and preschool outdoor environments.

    This study applies a qualitative approach through a case study of the municipality of Eskilstuna. By conducting interviews and a documentary study, data regarding the municipality’s work with school and preschool outdoor environments was generated. In order to gain an understanding of the conditions for municipal community planning, legislation as well as government and municipal documents were studied. A literate review was also conducted with the aim of studying previous work on the child perspective, the child impact assessment, the child-friendly outdoor environment and collaborative planning. Together with data collected from expert interviews this constitutes the study’s theoretical framework that in turn formed the basis for the following discussion.

    The results prove that child-friendly outdoor environments for schools and preschools comprise several factors that promote children’s development: room for outdoor play, reduced traffic, green and natural environments, variation and challenges. Among these, room for outdoor play, the size of the school or preschool playground, is the fundamental factor.

    The study also shows that school and preschool outdoor environments are a matter that often conflicts with other challenges that the municipal community planning has to deal with. In the municipality of Eskilstuna there is an ambition to create child-friendly outdoor environments for schools and preschools. However, the lack of available places as well as strategies and guidelines makes this difficult in practice. In order to create child-friendly outdoor environments for schools and preschools the results indicate the importance of using a collaborative approach through cooperation and mutual understanding between different actors. Also, it is stated that children’s needs should be highlighted in an early stage of the process to ensure room for school and preschool playgrounds in the dense city.

  • 175.
    Andersson, Magnus
    Blekinge Institute of Technology, Faculty of Engineering, Department of Spatial Planning.
    Östra stranden - En ny stadsdel i den historiska staden Sölvesborg: (Alternativt förslag till exploatering av planområdet Ljungaviken)2015Independent thesis Advanced level (degree of Master (One Year)), 20 credits / 30 HE creditsStudent thesis
    Abstract [sv]

    Arbetet handlar om en stadsdels exploatering i förhållande till staden som den skiljs från genom ett vattenrum. Stadsdelens placering gör att det är ett avstånd till stadskärnan där alla funktioner såsom handel, service, kommunikationer, nöjen och restauranger med mera finns.

    Regionförstoringen ställer krav på mindre orter och småstäder när avstånd mäts i tid istället för kilometer, samtidigt som kraven på attraktiva boende- och livsmiljöer ständigt ökar i konkurrensen om nya invånare. Förhållandet mellan stad och land är en faktor som spelar stor roll i utvecklingen av de städer och orter som inte är dominerande i regionen.

    Sölvesborg är en småstad med medeltida rötter i Blekinge län som har haft en stor nedgång i sitt näringsliv när den stora arbetsplatsen på orten lade ner under 1980-talet. Sölvesborgs kommun ligger i en expansiv region med stora arbetsgivare i de kringliggande kommunerna vilket har lett till att stora delar av befolkningen pendlar ut ur kommunen för att arbeta. Staden är en trädgårdsstad, som ligger på Sölvesborgsvikens västra sida, som lockar med ett attraktivt boende med närhet till både skog och skärgård. Sölvesborg har goda kommunikationer och flera större städer i närheten.

    För att kunna locka till sig flera invånare har beslut fattats att ett område på den östra sidan av Sölvesborgsviken exploateras. Det innebär att den historiskt sett obebyggda delen av viken skall bli en del av staden. Kommunen har upprättat en detaljplan för ett bostadsområde som har döpts till Ljungaviken och förbinds till staden med en gång- och cykelbro över vattenrummet.

    Jag har valt att analysera kommunens planförslag med hjälp av en ortsanalys som innehöll delar som geografi, karaktär, historia, funktioner, trafikstruktur, bebyggelsestruktur med mera samt en SWOT-analys gav sedan ett antal slutsatser som har legat till grund för mitt planförslag för stadsdelen.

    I planförslaget har det förts ett resonemang om förhållandet mellan stad och land, samt husr stadsdelen kan knyta an till den befintliga bebyggelsen så att det inte skapas barriärer annat än dde geografiska som redan finns. Vilken karaktär stadsdelen skall ha är en annan grundläggande fråga som behövde besvaras. Likaså hur stadsdelen skall möta sina omgivningar och de andra bebyggelseområdena i som finns i dess närhet har lett till resonemang om både strukturen på bebyggelsen och  grönområdena. De slutsatser som ortsanalysen avslöjade gav mig förutsättningar att utveckla stadsdelen i en annan riktning än vad kommunen har gjort vilket innebär att jag har skapat en stadsdel som har fler funktioner än vad som detaljplanen medger. Likaså har planförslaget en stadsmässighet och en koppling till omgivningarna som saknas i kommunens förslag.

    Jag hoppas att detta arbetet skall ses som ett diskussionsunderlag för hur stadsdelar i perifera lägen skall utvecklas.

  • 176.
    Andersson, Oskar
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Concrete Structures.
    Seppälä, Max
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Concrete Structures.
    Verification of the response of a concrete arch dam subjected to seasonal temperature variations2015Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Many dams existing today were constructed around fifty years ago. Condition monitoring is essential for maintaining high safety and determining the current level of safety and stability for these dams. There is a need for new monitoring techniques and finite element coupled monitoring could be one of these techniques. A concrete arch dam located in Sweden is modelled and calibrated with respect to concrete temperature measurements. The temperature distribution is then defined as a prescribed strain in a structural mechanical model in which a parametric study is performed. The results from the parametric study are compared to measurements of the crest deformation and a combination of parameters is found giving the lowest difference between measurements and model results for the mid-section. The results show that the finite element model can be used to predict the behavior of the dam with acceptable deviation. The parametric study indicates that the reference temperature of the concrete has little effect on the amplitude of the deformation and that the governing factor is the coefficient of thermal expansion.

  • 177.
    Andersson, Petra
    et al.
    RISE - Research Institutes of Sweden, Safety and Transport, Safety.
    Aras, Silvia
    Lunds University, Sweden.
    Arvidson, Magnus
    RISE - Research Institutes of Sweden, Safety and Transport, Safety.
    Frantzich, Håkan
    Lunds University, Sweden.
    Larsson, Ida
    RISE - Research Institutes of Sweden, Safety and Transport, Safety.
    Vermina Lundström, Frida
    RISE - Research Institutes of Sweden, Safety and Transport, Safety.
    Nilsson, Daniel
    Lunds University, Sweden.
    Runefors, Marcus
    Lunds University, Sweden.
    Riskreducerande åtgärder för dödsbränder i bostäder2018Report (Other academic)
    Abstract [en]

    Thisreport summarizes the work conducted within the project ”Analysis of physicaldeterminants and technical measures in support of the zero vision” financed bythe Civil Contingency Authority (MSB) in Sweden. The work aims to find measuresto prevent and reduce the number of fatalities in fires in residentialbuildings in a Sweden, a list of such measures is provided in the end of thereport. The list is based on work conducted in several small sub-projects, ashort summary of these is also provided in the report.

  • 178.
    Andersson, Petra
    et al.
    RISE - Research Institutes of Sweden, Safety and Transport, Safety.
    Wikman, Johan
    RISE - Research Institutes of Sweden, Safety and Transport, Safety.
    Arvidson, Magnus
    RISE - Research Institutes of Sweden, Safety and Transport, Safety.
    Larsson, Fredrik
    RISE - Research Institutes of Sweden, Safety and Transport, Electronics.
    Willstrand, Ola
    RISE - Research Institutes of Sweden, Safety and Transport, Safety.
    Safe introduction of battery propulsion at sea2017Report (Other academic)
    Abstract [en]

    Electric propulsion using batteries as energy storage has the potential to significantly reduce emissions from shipping and thus the environmental impact. The battery type that is currently on the top of the agenda to be used for ship propulsion applications is Li-ion batteries. Li-ion batteries pose different safety issues than e.g. other propulsion technologies and other batteries such as lead-acid batteries. It is essential that the safety level on board, including fire safety, is maintained, when introducing electric propulsion with energy storage in batteries. This report discusses the different regulations and guidelines available today for fire safety of batteries on board in relation to current knowledge about Li-ion batteries. Also fire safety measures available on board ships today and their applicability for Li-ion batteries is discussed, as well as the different test methods available and their applicability. A workshop gathering different stakeholders from Sweden, Norway and Finland identified fire safety as the main challenge for the introduction of battery propulsion at sea. The workshop concluded that future work is desired in order to increase knowledge and to develop publicly available strategies, training and designs.

  • 179.
    Andersson, Roy
    et al.
    Högskolan i Borås, Institutionen Ingenjörshögskolan.
    Månsson, Bo
    Högskolan i Borås, Institutionen Ingenjörshögskolan.
    Yar Hamidi, Daniel
    Högskolan i Borås, Institutionen Handels- och IT-högskolan.
    Resilience in the supply and demand chain a new management strategy2012Conference paper (Other academic)
    Abstract [en]

    The length and complexity of the supply chain tend to increase, rather than diminish, thereby making the supply chain riskier and less predictable and, hence, more vulnerable. At the same time, customers are becoming increasingly demanding. The challenge to businesses today is to create a resilient supply chain in order to manage and mitigate risk and vulnerability. The purpose of this paper is to describe the use methods and tolls from quality and logistics can improve supply chain resilience. There are five principles that characterise supply chain resilience: risk management culture, agility, design-and innovation-led organisations, collaboration and spreading and anchoring of the vision, goal, values and methods. Using a combined quality management philosophy, the speed of process could be increased, and the responsiveness and flexibility could be improved, which means quicker response to changes. It has also been indicated that a combined quality management philosophy improves the companies’ resilience, due to their increased agility and strengthened ability to handle variability and risk management. Quality management tools can be very effective in the companies’ efforts to control supply chain risk and to identify risk sources of variation, even outside the focal company.

  • 180.
    Andersson, Roy
    et al.
    University of Borås, School of Engineering.
    Månsson, Bo
    University of Borås, School of Engineering.
    Yar Hamidi, Daniel
    University of Borås, School of Business and IT.
    Resilience in the supply and demand chain a new management strategy2012Conference paper (Other academic)
    Abstract [en]

    The length and complexity of the supply chain tend to increase, rather than diminish, thereby making the supply chain riskier and less predictable and, hence, more vulnerable. At the same time, customers are becoming increasingly demanding. The challenge to businesses today is to create a resilient supply chain in order to manage and mitigate risk and vulnerability. The purpose of this paper is to describe the use methods and tolls from quality and logistics can improve supply chain resilience. There are five principles that characterise supply chain resilience: risk management culture, agility, design-and innovation-led organisations, collaboration and spreading and anchoring of the vision, goal, values and methods. Using a combined quality management philosophy, the speed of process could be increased, and the responsiveness and flexibility could be improved, which means quicker response to changes. It has also been indicated that a combined quality management philosophy improves the companies’ resilience, due to their increased agility and strengthened ability to handle variability and risk management. Quality management tools can be very effective in the companies’ efforts to control supply chain risk and to identify risk sources of variation, even outside the focal company.

  • 181.
    Andersson Schwarz, Jonas
    Södertörn University, School of Culture and Education, Media and Communication Studies.
    Platform Logic: An Interdisciplinary Approach to the Platform-Based Economy2017In: Policy & Internet, ISSN 1944-2866, E-ISSN 1944-2866, Vol. 9, no 4, p. 374-394Article in journal (Refereed)
    Abstract [en]

    Digital platforms are not just software-based media, they are governing systems that control, interact, and accumulate. They also solidify markets; that is, social networks of exchange that do not necessarily leave data traces, into infrastructure, that is, material arrangements of traceable activity. This article examines the forms of domination found in this digital platform model, and corrects some existing simplistic theoretical conclusions about digital platforms. It first provides a schematic overview of digital infrastructures of governance, and the attendant systemic mechanics they engender. It then argues that we need a more syncretic, interdisciplinary approach to the platform-based economy. The shifting emphases of different academic disciplines in relation to digital platforms are only partially grounded in their different normative biases; they can also be attributed to use of different disciplinary lenses. The field of information systems management and design studies is chiefly concerned with direct, technical interplatform affordances and connections, and with providing observations of certain systemic attributes of digital platforms. Critical political economy, by contrast, mainly considers the emerging transnational, geopolitical formations of platform capitalism. The interplay between these different systemic mechanics is summarized and presented here in the concept of "platform logic."

  • 182.
    Andersson, Sebastian
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Ecotechnology and Sustainable Building Engineering.
    Varmformade eller kallformade konstruktionsrör ur ett lönsamhetsperspektiv: Undersökning av ekonomisk differens i valet mellan VKR och KKR2015Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    In Sweden, hot formed rectangular hollow sections (HFRHS) can be 15-23 % more expensive than cold formed rectangular hollow sections (CFRHS) of the same section size. Although the price on CFRHS is lower, estimations reveals that   - from the total use of HFRHS and CFRHS in Swedish steel buildings - CFRHS is only utilized by less than 5 % compared to 95 % HFRHS. This study began by examining the differences between these two types of steel. The price difference between the two processed metal types was then calculated when both of them were subjected to a centric compressive force under the same conditions. The purpose was to compare prices and find out which one is the most economically feasible, offering a more profitable choice between HFRHS or CFRHS.

    The design buckling resistance of all the section sizes in Tibnor kon­­struktions­tabeller was calculated for every possible combination out of ten different lengths between 1 m and 10 m, ten different loadings between 100 kN and 1000 kN and two different support conditions being pinned at both ends and fixed at both ends. The sections sizes of CFRHS and HFRHS that withstood the loading and held the lowest prices were compared by calculating the price difference as per­centage increment or decrement between the two types of hollow sections.

    In 80 % of the cases, when pinned at both ends, CFRHS showed to be the most economically feasible alternative. When fixed at both ends the same number was 86 %. The average price difference was 10-11 %, showing an absolute deviation of approximately 8‑12 %.

    These findings conclude that using only CFRHS can result in savings of 10‑11 % from reduced costs of steel, compared to only using HFRHS. From the observed variation of the price differences another conclusion is drawn that there aren’t any tendencies showing HFRHS or CFRHS to be more economically feasible than the other in a specific interval of length or loading.

    The recommendation is to optimize and use the type of steel that is the most economically feasible under the current circumstances. If an optimization isn’t possible then the recommendation is to use CFRHS.

  • 183. Andrée, Martin
    et al.
    Larsson, Karolina
    Nordqvist Darell, Fanny
    Malm, Linus
    Tullberg, Odd
    Wallberg, Ann
    Norrsell, Johan
    Paasch, Jesper M.
    Seipel, Stefan
    Paulsson, Jenny
    KTH, School of Architecture and the Built Environment (ABE), Real Estate and Construction Management, Real Estate Planning and Land Law.
    Slutrapport för projektet Smart planering för byggande: Delprojekt 3: BIM som informationsstöd för 3D fastighetsbildning2018Report (Other academic)
  • 184.
    Andrée, Martin
    et al.
    Lantmäteriet.
    Larsson, Karolina
    KLM; Stockholms stad.
    Nordqvist Darell, Fanny
    Stockholms stad.
    Malm, Linus
    Tyréns.
    Tullberg, Odd
    WSP.
    Wallberg, Ann
    JM.
    Norsell, Johan
    NAI Svefa.
    Paasch, Jesper M.
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management, Land management, GIS.
    Seipel, Stefan
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management, Computer science.
    Paulsson, Jenny
    Kungliga Tekniska Högskolan, Stockholm.
    Slutrapport för projektet Smart planering för byggande: Delprojekt 3 - BIM som informationsstöd för 3D fastighetsbildning2018Report (Other academic)
    Abstract [sv]

    Samhällsbyggnadsprocessen behöver utvecklas och bli smartare, öppnare och mer effektiv för ett ökat bostadsbyggande. En digitalisering av samhällsbyggnadsprocessen kan ge ett effektivare samarbete mellan kommun, fastighetsägare, byggherrar, medborgare, näringsliv och myndigheter.Vid bildande av tredimensionellt avgränsade fastigheter eller fastighetsutrymmen (3D-fastigheter) behöver gränsernas läge redovisas både verbalt och i kartor och ritningar, detsamma gäller berörda rättigheter. Det är idag ofta svårt att korrekt redovisa en 3D-volym med enbart dagens pappersritningar och även svårt att läsa en registerkarta i 2D med fastigheter och rättigheter beslutade i 3D. Beslutsunderlagen i fastighetsbildnings-processen behöver bli mer enhetliga och entydiga samt fastighetsinformationen behöver bli återanvändningsbar i hela samhällsbyggnadsprocessen.I detta projekt har vi studerat informationsbehovet i de olika tidpunkterna under fastighetsbildningsprocessen för 3D-fastigheter med fokus på vem som är ansvarig för att tillhandahålla informationsunderlag för att identifiera krav på utformning av 3D-modeller (t.ex BIM) och 3D-stöd för fastighetsbildning.Internationellt finns det ett stort intresse och många frågeställningar gällande samspelet mellan BIM och Fastighetsinformation; det är däremot ganska få fall som har identifierats där man har arbetat praktiskt med BIM i relation till redovisning av 3D-fastigheter.Projektethar även tittat på behov av visualisering och tillhandahållande av fastighetsinformation i 3D, hur informationen bör utformas för att kunna tolkas korrekt samt nyttjas vidare av andra aktörer i samhällsbyggnadsprocessen.Slutsatsen i projektetär att en framtida arbetsmodell där man i samband med myndighetsutövningen för fastighetsbildning samverkar med stöd av BIM och geografisk information i ärendehandläggningen kan ge stora effekter på både myndighetens effektivitet och i ärendeutövningen och för förståelsen av fastighetbildningsbeslutet hos samtliga intressenter i processen. För att det arbete som genomförts i denna utredning skall få genomslag i den dagliga verksamheten rekommenderar vibland annatatt de statliga och kommunala lantmäterimyndigheterna arbetar vidare med att utveckla arbetsprocessen och rekommendationerna för 3D-fastighetsbildning baserat på resultatet från detta projekt och redan i dagens modell efterfrågar att man i handläggningsprocessen kan arbeta BIM-baserat även om kommande beslutshandlingar under en övergångsperiod fortfarande kommer att vara baserade på ritningsbilagor i 2D.

  • 185. Andrée, Martin
    et al.
    Paasch, Jesper M.
    Paulsson, Jenny
    KTH, School of Architecture and the Built Environment (ABE), Real Estate and Construction Management, Real Estate Planning and Land Law.
    Seipel, Stefan
    BIM and 3D property visualisation2018Conference paper (Other academic)
  • 186.
    Andrén, Anna
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Degradation of rock and shotcrete due to ice pressure and frost shattering2009Licentiate thesis, comprehensive summary (Other academic)
    Abstract [en]

    In recent years the Swedish Rail Administration has observed an increased incidence of shotcrete and rock fall-outs in its tunnels, for which reason it has initiated several research projects, of which the present project entitled "Degradation of rock and shotcrete due to ice pressure and frost shattering" is one. The aim of this licentiate project was to bring together experience and information relating to ice formation and the effect of ice pressure on fault zones, cracks and, in particular, the shotcrete/rock interface. Furthermore, the hypothesis from the literature review is tested and the results of the laboratory tests are presented.When water freezes, a 9 % volumetric expansion occurs according to the phase transition into ice. This can exert a pressure on the adjacent material. If this ice pressure exceeds the tensile strength of the adjacent material or the adhesive strength of the shotcrete/rock interface, the material will be damaged. The degree of damage depends, among other factors, on the degree of saturation of the material. A partially saturated material can resist breakage despite its low tensile strength, because ice expansion and pore-water distribution can occur in pores which were initially filled with air. A fully saturated material however yields to frost action regardless of its tensile strength, because it has none of the free space this expansion requires.Volumetric expansion is not the only cause of frost shattering and research shows that the frost action in rocks is the same as in soils, when the rock has access to water during freezing. In soil, water is drawn towards the frozen fringe and causes ice lenses to grow. In a similar manner water tends to migrate in rock and causes ice bodies to grow inside pores and cracks. This water migration takes place because a thin film of adsorbed water occurs at the surface of mineral particles and it is in this water film that water is able to migrate towards the frozen zones. Experimental work has shown that a considerable amount of adsorbed water remains unfrozen at sub-zero temperatures not only in soils, but also in rocks, which enable water migration.Water migration and ice growth thus depend not only on access to water and freezing temperatures, but also on the duration of these temperatures and the freezing rate. If rock or shotcrete is subjected to rapid freezing, the thickness of the water film is quickly reduced and the water migration is inhibited, which limits frost damages to rock and shotcrete. By contrast, a slow freezing allows water migration to occur over a longer period, which can result in greater frost damage to rock and shotcrete. The field investigations found changes to the freezing periods as well as their duration to be of major importance to ice formation growth. If the freezing period was of long duration, several of the cracks and the leakage spots freeze. If leakage is subjected instead to short periods of freezing and thawing, the water in the crack will never freeze and will continue to leak, resulting in ice formation growth. In cold areas, such as the north of Sweden, this problem takes place even far inside the tunnels. This phenomenon occurs because the leakage water transports heat from the rock mass to the cold tunnel wall. The heat content of the water keeps the rock around the crack opening from freezing despite sub-zero tunnel air temperatures. Hence, the leakage spot will continue to leak, until a certain temperature and temperature duration is achieved, which results in ice formations when the water meets the cold tunnel air. Another experience in the field investigations was that the rock and shotcrete fall-outs often occurred in areas with leakage problems.The results of the laboratory tests performed in this licentiate project also show that water in combination with freezing temperature can cause degradation problems. The tensile tests undertaken, showed that the adhesive strength decreased about 50 % when the shotcrete/rock samples had been subjected to freeze-thaw cycles. Furthermore, acoustic emission measurements (AE) showed that more events took place when the shotcrete/rock panels had access to free water during freezing. The literature review, field investigations of railway tunnels and the laboratory tests shows that access to water during freezing can cause damage to the shotcrete/rock interface. This confirms the hypothesis that shotcrete and rock fall-outs can occur because ice pressure in a crack or at the interface exceeds the tensile strength of the material or the adhesive strength between rock and shotcrete. One thing that the laboratory tests failed to provide a satisfactory answer to, was whether these fall-outs could occur due to widening of an initially small area of poor adhesion around a rock crack opening. However, the laboratory test showed a lot of activity during freezing in those areas prepared with poor adhesion. It thus it appears that small areas of poor adhesion in some way affect deterioration of the adhesive strength of the shotcrete/rock interface.

  • 187.
    Andrén, Anna
    Luleå tekniska universitet.
    Degradation of rock and shotcrete due to ice pressure and frost shattering2006Report (Other academic)
    Abstract [en]

    In the past few years Banverket has observed an increase in the number of incidences involving fall outs of shotcrete and rock in railway tunnels. Several research projects were therefore initiated by Banverket. This project “Degradation of rock and shotcrete due to ice pressure and frost shattering” is one of them. The purpose of this report is to gather experience and information about how ice is formed and how ice pressure influences fault zones, cracks and the interface between rock and shotcrete. When water freezes, a 9% volumetric expansion occurs according to the phase transition into ice. This can exert a pressure on the adjacent material. If there is water in small openings such as pores or cracks that cannot allow for a 9% volume expansion, breakage of the adjacent material will occur. The volumetric expansion of water/ice can only be prevented by pressures of 207 MPa, which is the pressure melting point of ice. As a comparison, consider a rock with a tensile strength in the order of 10 MPa. This rock material cannot prevent the ice from forming. Therefore, in a saturated rock there will always be a breakage if the water is freezing in a confined space. If the pressure of ice exceeds the tensile strength of the adjacent material, the material will be damaged, and the degree of damage is besides other factors dependent on the degree of saturation of the rock. A partially saturated rock can resist breakage despite its low strength because the expansion of ice and distribution of pore water can occur in pores that were initially filled with air. A fully saturated rock however yields to frost action regardless of its strength, because it doesn’t have any free space, which is needed for the expansion. But the 9% volumetric expansion is not the only cause of frost shattering. Research shows that the frost action in rocks is the same as in soils when the rock has access to water during freezing. In soil, water is drawn towards the frozen fringe and causes ice lenses to grow. In a similar manner water tends to migrate in rock and causes growth of ice bodies inside pores or cracks. The water migration takes place due to the fact that a thin water film of adsorbed water occurs at the surface of mineral particles and it is in this water film that the water has the opportunity to migrate towards the frozen zones. Experimental work has shown that considerable amount of adsorbed water remains unfrozen at subfreezing temperatures not only in soils, but also in rocks. This encourages the migration. With continuous decrease of temperature, the adsorbed water in the water film starts to freeze and the part of unfrozen water is reduced. Thus with decreasing temperature the water film, which separates the ice from the solid particles become thinner. This reduces the permeability of the material and inhibits the water migration towards the frozen fringe. With further decreasing of the temperature the migration can stop and so also the growth of ice bodies. The water migration and thereby the ice growth is not only dependent upon access to water and freezing temperatures, but also on the freezing rate and duration. If the rock is exposed to a rapid freezing rate, the thickness of the water film is quickly reduced and the water migration becomes inhibited, which delimits the frost damages of rock and shotcrete. In contrast, slow freezing rate permits water migration to occur for a longer period, which can result in greater frost damage of rock and shotcrete.

  • 188.
    Andrén, Anna
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Dahlström, Lars-Olof
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Temperaturflöden i järnvägstunnlar – Glödberget2011Report (Other academic)
    Abstract [en]

    During the winter ice is causing major problems in several of the Swedish Transport administrations railway tunnels. Freezing water is forming icicles and pillars that can fall down at track, and grow so large that they intrude on the clearance gauge. Lighting equipment and cables can be broken because of the ice load and tracks can become cowered with ice Periodic freezing can cause frost shattering and this process can cause fall-outs of rock and shotcrete. In order to maintain safety and prevent traffic disruption, many tunnels requiring extensive maintenance. In order to reduce maintenance of the tunnels, improved knowledge about frost penetration and the effects of ice pressure on the load-bearing capacity of the tunnel is required. 2002 the University of Gävle and KTH performed a model study to determine the temperature conditions in tunnels. To verify the model study field measurements are carried out in collaboration between the Transport Administration and Luleå University of Technology. This technical report describes the tests conducted so far in the Glödberget tunnel at Nyåker, 80 km south-west of Umeå. Measurements show that the developed models underestimate the frost penetration. Although the tunnel is 1680 meters long, the frost penetrates the entire length of the tunnel even if the temperature outside the tunnel is just a few degrees below zero. A contributing factor to why the field measurements and model do not conform can be that the model study is based on a completely uninsulated tunnel. In the Glödberget tunnel a large part of the walls and roof are covered the frost insulated drains. The function of the frost insulated drains is to prevent the cold tunnel air from reaching a leakage point and causing water to turn into ice. However, the insulation does not only prevent the cold air from reaching the rock, but also prevents the heat from the rock mass from entering the tunnel and warming up the cold tunnel air. Consequently, the frost penetrates further into the tunnel than it would do if the heat from the rock mass were allowed to warm up the outside air on its way into the tunnel. The amount of frost insulated drains and how much of the tunnel walls and roof that are covered are thereby affecting the length of the frost penetration. Temperature measurements has been carried out down into the ballast bed. To eliminate the risks with freezing drainage water, the drainage pipes are located at a depth of 2 m under the level of the rails. Measurements show that the temperature does not penetrate as far down as earlier feared and the depth of the pipes in the middle parts of the tunnel could be made shallower, with respect to risk of frost. Temperature measurements behind a frost insulated drain in the middle of the track tunnel, has shown that drains are able to smooth out the temperature changes that occur in the tunnel air. But when the temperature is negative for a longer period, the temperature behind the drain drops below 0ºC. Then the drainage ability is reduced due to icing and it can cause frost damage to the drain. Measurements of air temperature in the adjacent service tunnel shows how frost penetration is affected by air movement. The service tunnel is closed with gates at both ends. When the air in a tunnel is not exposed to movement, it is heated by geothermal heat and adopt the same temperature as the rock. Rock temperatures usually coincide with the average annual temperature applicable to the area where the tunnel is located. For the Glödberget tunnel there is a very good agreement between the average annual temperature for the area and the measurements performed in the service tunnel.

  • 189.
    Andrén, Anna
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Dahlström, Lars-Olof
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Temperaturflöden i järnvägstunnlar och konsekvenser för drift och underhåll2008In: Bergmekanikdag: föredrag vid Bergmekanikdag i Stockholm 10 mars 2008, Stiftelsen bergteknisk forskning - Befo , 2008Conference paper (Other academic)
  • 190.
    Ansin, Frida
    et al.
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management.
    Rödin, Matilda
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management.
    Exploateringsavtal: Samverkan mellan kommun, lantmäterimyndighet och exploatör2016Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    On January 1st 2015 an amendment passed in the Planning and Building Act in order to simplify and rationalize the detailed development plan process. The amendment includes a new part for cadastral authority in the plan process and new rules for development agreement. The municipalities should adopt guidelines for these agreements. The aim of this study was to describe how the collaboration between municipality, cadastral authority and developer works when it comes to development agreement and how the amendment in the Planning and Building Act concerning the development agreement has affected these participants.

    To answer the thesis a web survey was sent to all municipalities in Sweden to get an overview of how the amendment has influenced the country. Semi-structured telephone interviews were also performed in five municipalities that have adopted guidelines for the development agreements. The interviews were performed with land development engineers, cadastral supervisors and developers to receive their perspective of the collaboration and how the amendment has affected them.

    The results of the study have shown that negotiations have started earlier between municipalities and developers after the amendment in the Planning and Building Act passed. The municipalities also need to pay compensation when they take land for public places after the amendment. The cadastral authority’s more active part has contributed to assure that ambiguities and shortcomings might be solved in the development agreement. However, it is still too early to tell what the cadastral authorities part has contributed in the development agreements. The developer has got a major opportunity to influence the development agreements. The collaboration between municipalities, cadastral authorities and developers has become clearer and improved but overall it is unchanged. There are opportunities for improvement in the long term.

  • 191.
    Antevik, Fredrik
    Stockholm University, Faculty of Science, Department of Geological Sciences.
    Utvärdering av efterinjektering med polyuretan utifrån geologiska och hydrogeologiska grundförutsättningar2016Independent thesis Advanced level (degree of Master (Two Years)), 30 credits / 45 HE creditsStudent thesis
    Abstract [en]

    The aim of this master thesis is to evaluate the results of selective post-excavation grouting with polyurethane resin in the subway of Stockholm.Dripping and leakage of water into hard rock tunnels is a costly and commonly occurring problem. Water leakage does not only lead to damage to tunnel installation but may also affect the area above the tunnel due to lowering of the ground water table. To solve this problem there are several methods to prevent water entering the tunnel or to divert it. One of the preventing methods are to grout using polyurethane based resins.This thesis evaluates a drip sealing project where eight point leakages where grouted during November 2015. Drip mapping was carried out before and after the grouting to evaluate the change in leakage amount to determine whether the grouting methodology is suitable for future projects. The drip mapping was carried out during a year before the sealing attempt to investigate the leakages natural variation and with greater certainty being able to evaluate the leakage change after the grouting had been carried out.The evaluation of the grouting showed that none of the point leakages were sealed to 100 %. Only three of the leakages decreased, four increased and one showed no change. The natural variations during the evaluation period, during and after the grouting attempt indicates a natural rise in leakage amount induced by an increase in precipitation and rising seasonal trend.The change in leakage amount for every leakage point was compared to geological and hydrogeological parameters to be able to explain the cause of the results and to determine which conditions the methodology depends on. The correlation with original leakage amount, grouting volume and hydraulic aperture where the strongest and could best be explained by second degree polynomials. By using the equations for the polynomials an interval could be determined where the grouting methodology theoretically would lead to the greatest decrease in leakage amount. There are some uncertainty in the interpretation whether a natural signal in the grouting results led to a correlation due to an internal coupling between the parameters.

  • 192. Appelgren, J
    et al.
    Schunnesson, Håkan
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Operation, Maintenance and Acoustics.
    Nord, G
    Automation and smart drill rigs2006In: Mine planning and equipment selection 2006: Fifteenth International Symposium on Mine Planning & Equipment Selection / [ed] Marilena Cardu ; Enrica Michelotti, Fiordo , 2006Conference paper (Refereed)
  • 193.
    Arasteh Khouy, Iman
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Operation, Maintenance and Acoustics.
    Cost-effective maintenance of railway track geometry: a shift from safety limits to maintenance limits2013Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    Railway infrastructure is a complex system which comprises different subsystems. Long life span is one of the important aspects of this prime mode of transport. However, the useful life of its assets is highly dependent on the maintenance and renewal strategy used during the assets’ life cycle. Today’s demands on the railway industry call for increased capacity, including more trains, travelling at higher speeds with higher axle loads. This increased usage results in higher degradation of railway assets and higher maintenance costs. Formerly, railway maintenance procedures were usually planned based on the knowledge and experience of the infrastructure owner. The main goal was to provide a high level of safety, and there was little concern for economic issues. Today, however, the deregulated competitive environment and budget limitations are forcing railway infrastructures to move from safety limits to cost-effective maintenance limits to optimise operation and maintenance procedures. The goal is to make operation and maintenance cost-effective while still meeting high safety standards.One of the main parameters to assure railway safety and comfortable railway service is to maintain high quality of track geometry. Poor quality of track geometry, directly or indirectly, may result in safety problems, speed reduction, traffic disruption, greater maintenance cost and higher degradation rate of the other railway components (e.g. rails, wheels, switches and crossings etc.). The aim of this study is to develop a methodology to optimise track geometry maintenance by specifying cost-effective maintenance limits. The methodology is based on reliability and cost analysis and supports the maintenance decision-making process. The thesis presents a state-of-the-art review of track geometry degradation and maintenance optimisation models. It also includes a case study carried out on the iron ore line in the north of Sweden to analyse the track geometry degradation and discuss possible reasons for the distribution of failures along the track over a year. It describes Trafikverket’s (Swedish Transport Administration) maintenance strategy regarding measuring, reporting on and improving track quality, and it evaluates the efficiency of this strategy. It introduces two new approaches to analyse the geometrical degradation of turnouts due to dynamic forces generated from train traffic. In the first approach, the recorded measurements are adjusted at crossing point and then the relative geometrical degradation of turnouts is evaluated by using two defined parameters, the absolute residual area (ARa) and the maximum settlement (Smax). In the second approach, various geometry parameters are defined to estimate the degradation in each measurement separately. It also discusses optimisation of the track geometry inspection interval with a view to minimising the total ballast maintenance costs per unit traffic load. The proposed model considers inspection time and the maintenance-planning horizon time after inspection and takes into account the costs associated with inspection, tamping and risk of accidents due to poor track quality. Finally, it proposes a cost model to identify the cost-effective maintenance limit for track geometry maintenance. The model considers the actual longitudinal level degradation rates of different track sections as a function of million gross tonnes (MGT) / time and the observed maintenance efficiency.

  • 194.
    Arasteh khouy, Iman
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Operation, Maintenance and Acoustics.
    Optimization of track geometry maintenance: a study of track geometry degradation to specify optimal inspection intervals2011Licentiate thesis, comprehensive summary (Other academic)
    Abstract [en]

    Railway infrastructure is a complex system which comprises different subsystems. Long useful life span is one of the important aspects of this prime mode of transport. The useful life length of its assets is highly dependent on the maintenance and renewal strategy used during its life cycle. Today’s demands on the railway industry call for increased capacity, including more trains, travelling at higher speeds with higher axle loads. This increased usage will result in higher degradation of railway asset and higher maintenance costs. However, due to the competitive environment and limited budgets, railway infrastructure managers are compelled to optimize operation and maintenance procedures to decrease operation and maintenance costs while meeting high safety standards. To assure track safety and maintain high quality, a cost effective track maintenance strategy is required, one based not only on technical and/or safety limits but also on cost-effective maintenance thresholds. RAMS (Reliability, Availability, Maintainability and Safety) and LCC (Life Cycle Cost) analyses, which are derived from reliable track condition data, provide an approach to specify cost effective maintenance strategy to lessen corrective maintenance actions and downtimes.One of the main parameters to assure railway safety and comfortable railway service is to maintain high quality of track geometry. Poor track geometry quality, directly or indirectly, may result in safety problems, speed reduction, traffic disruption, greater maintenance cost and higher degradation rate of the other railway components (e.g. rails, wheels, switch, crossings etc.). The aim of this study is to develop a methodology to optimize track geometry maintenance by using historical geometry data. The methodology is based on reliability and cost analysis and supports the maintenance decision-making process to identify cost-effective inspection interval. An important phase of track geometry maintenance optimization is to estimate the track degradation rate. Obtaining knowledge about degradation helps to properly schedule maintenance activities such as inspection and tamping.The thesis provides a methodology to identify a cost-effective inspection interval based on track degradation rate and cost drivers. It contains state-of-the-art track geometry maintenance optimization. It describes Trafikverket’s (Swedish Transport Administration) maintenance strategy regarding measurements, reporting on and improving track quality, and it evaluates the efficiency of this strategy. Finally, it includes a case study carried out on the iron ore line in north of Sweden that runs from Boden to Gällivare to evaluate track geometry degradation and analyze the probability distributions of failures. A cost model is developed in order to find optimal inspection interval.Keywords: Track geometry degradation, Track maintenance optimization, Maintenance planning, Tamping

  • 195.
    Arasteh khouy, Iman
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Operation, Maintenance and Acoustics.
    Larsson-Kråik, Per-Olof
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Operation, Maintenance and Acoustics.
    Nissen, Arne
    Trafikverket.
    Juntti, Ulla
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Operation, Maintenance and Acoustics.
    Schunnesson, Håkan
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Optimisation of track geometry inspection interval2014In: Proceedings of the Institution of mechanical engineers. Part F, journal of rail and rapid transit, ISSN 0954-4097, E-ISSN 2041-3017, Vol. 228, no 5, p. 546-556Article in journal (Refereed)
    Abstract [en]

    The measurement and improvement of track quality are key issues in determining the time at which railway maintenance must be performed and its cost. Efficient track maintenance ensures optimum allocation of limited maintenance resources which has an enormous effect on maintenance efficiency. Applying an appropriate tamping strategy helps reduce maintenance costs, making operations more cost-effective and leading to increased safety and passenger comfort levels. This paper discusses optimisation of the track geometry inspection interval with a view to minimising the total ballast maintenance costs per unit traffic load. The proposed model considers inspection time, the maintenance-planning horizon time after inspection and takes into account the costs associated with inspection, tamping and risk of accidents due to poor track quality. It draws on track geometry data from the iron ore line (Malmbanan) in northern Sweden, used by both passenger and freight trains, to find the probability distribution of geometry faults.

  • 196.
    Arasteh khouy, Iman
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Operation, Maintenance and Acoustics.
    Larsson-Kråik, Per-Olof
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Operation, Maintenance and Acoustics.
    Nissen, Arne
    Trafikverket.
    Kumar, Uday
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Operation, Maintenance and Acoustics.
    Cost-effective track geometry maintenance limits2016In: Proceedings of the Institution of mechanical engineers. Part F, journal of rail and rapid transit, ISSN 0954-4097, E-ISSN 2041-3017, Vol. 230, no 2, p. 611-622Article in journal (Refereed)
    Abstract [en]

    In the past, railway maintenance actions were usually planned based on the knowledge and experience of the infrastructure owner. The main goal was to provide a high level of safety, and there was little concern about economic and operational optimisation issues. Today, however, a deregulated competitive environment and budget limitations are forcing railway infrastructures to move from safety limits to cost-effective maintenance limits to optimise operation and maintenance procedures. By so doing, one widens the discussion to include both operational safety and cost-effectiveness for the whole railway transport system. In this study, a cost model is proposed to specify the cost-effective maintenance limits for track geometry maintenance. The proposed model considers the degradation rates of different track sections and takes into account the costs associated with inspection, tamping, delay time penalties, and risk of accidents due to poor track quality. It draws on track geometry data from the Iron Ore Line (Malmbanan) in northern Sweden, used by both passenger and freight trains, to estimate the geometrical degradation rate of each section. The methodology is based on reliability and cost analysis and facilitates the maintenance decision-making process to identify cost-effective maintenance thresholds.

  • 197.
    Arasteh khouy, Iman
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Operation, Maintenance and Acoustics.
    Larsson-Kråik, Per-Olof
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Operation, Maintenance and Acoustics.
    Nissen, Arne
    Kumar, Uday
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Operation, Maintenance and Acoustics.
    Geometrical degradation of switches and crossings on a Swedish heavy haul railroad: a case study2013In: Proceedings of 10th International Heavy Haul Association Conference, New Delhi, India, 2013, Vol. 1, p. 26-32Conference paper (Refereed)
    Abstract [en]

    Switches and crossings (S&Cs) are one of the most critical components of railway track systems in terms of safety, operation and maintenance. Each year, a considerable part of the maintenance budget is spent on inspection, maintenance and renewal of S&Cs. However, applying a cost-effective maintenance strategy helps to achieve the best performance at the lowest possible cost. In Sweden, the geometry of S&Cs is inspected at pre-defined time intervals by the STRIX track measurement car. In this paper, time series for the measured longitudinal level of S&Cs on the Iron Ore Line (Malmbanan) in northern Sweden have been used. Two parameters have been defined in this study, namely the absolute residual area (ARa) and the maximum settlement (Smax), to analyse the geometrical degradation of switches and crossings due to dynamic forces generated from train traffic. The paper also evaluates the growth rate of the longitudinal level degradation as a function of million gross tonnes (MGT). The results facilitate correct decision making in the maintenance process through understanding the degradation rate and defining the optimal maintenance thresholds for the planning process. In the long run this will lead to a cost-effective maintenance strategy with optimized inspection and maintenance intervals.

  • 198.
    Arasteh khouy, Iman
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Operation, Maintenance and Acoustics.
    Larsson-Kråik, Per-Olof
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Operation, Maintenance and Acoustics.
    Nissen, Arne
    Trafikverket.
    Lundberg, Jan
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Operation, Maintenance and Acoustics.
    Kumar, Uday
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Operation, Maintenance and Acoustics.
    Geometrical degradation of railway turnouts: a case study from a Swedish heavy haul railroad2014In: Proceedings of the Institution of mechanical engineers. Part F, journal of rail and rapid transit, ISSN 0954-4097, E-ISSN 2041-3017, Vol. 228, no 6, p. 611-619Article in journal (Refereed)
    Abstract [en]

    Turnouts are critical components of track systems in terms of safety, operation and maintenance. Each year, a considerable part of the maintenance budget is spent on their inspection, maintenance and renewal. Applying a cost-effective maintenance strategy helps to achieve the best performance at the lowest possible cost. In Sweden, the geometry of turnouts is inspected at predefined time intervals using the STRIX / IMV 100 track measurement car. This study uses time series for the measured longitudinal level of turnouts on the Iron Ore Line (Malmbanan) in northern Sweden. Two different approaches are applied to analyse the geometrical degradation of turnouts due to dynamic forces generated by train traffic. In the first approach, the recorded measurements are adjusted at the crossing point and then the relative geometrical degradation of turnouts is evaluated by using two defined parameters, the absolute residual area and the maximum settlement, In the second approach, various geometry parameters are defined to estimate the degradation in each measurement separately. The growth rate of the longitudinal level degradation as a function of million gross tonnes / time is evaluated. The proposed methods are based on characterisation of the individual track measurements. The results facilitate correct decision-making in the maintenance process through understanding the degradation rate and defining the optimal maintenance thresholds for the planning process. In the long run, this can lead to a cost-effective maintenance strategy with optimised inspection and maintenance intervals.

  • 199.
    Arasteh khouy, Iman
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Operation, Maintenance and Acoustics.
    Schunnesson, Håkan
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Juntti, Ulla
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Operation, Maintenance and Acoustics.
    Nissen, Arne
    Larsson-Kråik, Per-Olof
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Operation, Maintenance and Acoustics.
    Evaluation of track geometry maintenance for heavy haul railroad in Sweden: a case study2014In: Proceedings of the Institution of mechanical engineers. Part F, journal of rail and rapid transit, ISSN 0954-4097, E-ISSN 2041-3017, Vol. 228, no 5, p. 496-503Article in journal (Refereed)
    Abstract [en]

    The measurement and improvement of track quality are key issues in determining both the restoration time and cost of railway maintenance. Applying the optimal tamping strategy helps reduce maintenance costs, making operations more cost effective and leading to increased safety and passenger comfort. In this paper, track geometry data from the iron ore line (Malmbanan) in northern Sweden, which handles both passenger and freight trains, are used to evaluate track geometry maintenance in cold climate. The paper describes Trafikverket’s (Swedish Transport Administration) tamping strategy and evaluates its effectiveness in measuring, reporting, and improving track quality. Finally, it evaluates the performance of the maintenance contractor and discusses the importance of the functional requirements stated in the outsourcing contracts.

  • 200.
    Arasteh khouy, Iman
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Operation, Maintenance and Acoustics.
    Schunnesson, Håkan
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Nissen, Arne
    Trafikverket.
    Juntti, Ulla
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Operation, Maintenance and Acoustics.
    Evaluation of track geometry degradation in Swedish heavy haul railroad: a case study2012In: International Journal of COMADEM, ISSN 1363-7681, Vol. 15, no 2, p. 11-16Article in journal (Refereed)
    Abstract [en]

    The measurement and improvement of track quality are key issues in determining both the time and cost of railway maintenance. Efficient track geometry maintenance ensures optimum allocation of limited maintenance resources and has an enormous effect on maintenance efficiency. Applying the appropriate tamping strategy also helps reduce maintenance costs, making operations more cost effective and leading to increased safety and passenger comfort. In this paper, track geometry data from the iron ore line in northern Sweden, which handles both passenger and freight trains, are used to calculate track quality degradation trend in a cold climate. The paper describes Trafikverket’s (Swedish Transport Administration) tamping strategy and illustrates the distribution of safety failures in different seasons. It also analyses the track geometry degradation and discuss about the possible reasons for distribution of failures over a year and along the track.

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