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  • 151.
    Elfgren, Lennart
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Gylltoft, Kent
    Luleå University of Technology.
    Utmattning av betong i kallt klimat: vinterbygge1985In: Tidningen Byggindustrin, ISSN 0349-3733, no 40, p. 19-20Article in journal (Other (popular science, discussion, etc.))
  • 152.
    Elfgren, Lennart
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Gylltoft, Kent
    Luleå University of Technology.
    Utmattningshållfasthet för anläggningskonstruktioner: en inventering1977Report (Other academic)
  • 153.
    Elfgren, Lennart
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Gylltoft, Kent
    Chalmers University of Technology.
    Utmattningshållfasthet hos betongkonstruktioner1997Report (Other (popular science, discussion, etc.))
    Abstract [sv]

    En översikt om utmattning av betongkonstruktioner att användas i civilingenjörsutbildningen på Chalmers tekniska högskola och Luleå tekniska universitet

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  • 154.
    Elfgren, Lennart
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Gylltoft, Kent
    Chalmers University of Technology.
    Engström, Björn
    Chalmers University of Technology.
    Krister Cederwall, 1932-2006: Minnesord2007Other (Other (popular science, discussion, etc.))
    Abstract [sv]

    Krister Cederwall föddes I Borås den 1 oktober 1932. Efter civilingenjörsexamen I väg- och vattenbyggnad på KTH arbetade han som konstruktör. Han flyttade efter några år till Göteborg och knöts till Chalmers tekniska högskola som forskningsassistent vid Hjalmar Granholms institution för byggnadsteknik där han blev tekn lic 1961. Under åren 1960-65 var han brokonstruktör vid Granholms konstruktionsbyrå och var bland annat med om att utforma broarna i Essingeleden I Stockholm. År 1965 utnämndes han till universitetslektor I betongbyggnad vid Chalmers och disputerade 1971 på en avhandling om stabilitet och långstidsdeformationer I tryckta betongkonstruktioner. När den nya tekniska högskolan I Luleå byggdes upp blev Krister Cederwall dess förste innehavare av professuren I Konstruktionsteknik. Han byggde med stor energi upp nya forskningsinriktningar som byggteknik i kallt klimat och studier av isbärighet och ishållfasthet. Han initierade även studier av massiva betongkonstruktioner och deras sprickbenägenhet. Han arbetade nära samman med byggföretag och knöt adjungerade professorer till högskolan. Han var tidigt ute med att använda sannolikhetsteori för att studera bärighet och att använda brottmekanik för att förstå hur konstruktioner går sönder och hur man undviker spröda brott. När professuren i betongbyggnad blev ledig på Chalmers 1983 efter Anders Losberg flyttade han tillbaka till Göteborg. Hans hjärta fortsatte dock att klappa för Luleå, och han var många gånger på besök för att gästföreläsa och delta i disputationer och licentiatseminarier i ämnen som han en gång initierat. Han blev professor emeritus I januari 1995 och avled den 1 november 2006 vid 74 års ålder.

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  • 155.
    Elfgren, Lennart
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    Hagentoft, Carl-Eric
    Chalmers tekniska högskola.
    Stille, Håkan
    KTH.
    Thelandersson, Sven
    LTH.
    Byggforskning i samverkan: Slutrapport2005Report (Other (popular science, discussion, etc.))
    Abstract [sv]

    Genom att bedriva internationellt slagkraftig forskning i Sverige säkerställs att

    • den senaste kunskapen finns tillgänglig inom landet

    • unga människor kan ges en internationellt konkurrenskraftig utbildning inom byggområdet

    • byggsektorn kan försörjas med arbetskraft som har god kompetens.

    På Chalmers, KTH, LTH och LTU finns ca 65 forskningsledare och därutöver ytterligare ca 160 seniorforskare. De handleder ca 445 doktorander varav ca 135 är industridoktorander som forskarutbildar sig på minst halvtid. Under den senaste treårsperioden producerades i medeltal ca 70 forskarexamensekvivalenter per år (en licentiatexamen motsvarar en halv ekvivalent och arbetet från licentiat till doktor ytterligare en halv ekvivalent).

    Vid en konferens på Arlanda den 14-15 oktober 2004 samlades ett 50-tal av forskningsledarna och diskuterade gruppvis och i plenum. Huvudfrågorna var hur man på bästa sätt kan utnyttja de resurser som finns och formera sig för att bli mer slagkraftiga såväl nationellt som internationellt. Före konferensen ombads forskningsledarna att besvara ett antal frågor rörande omfattningen på sin verksamhet. Alla har svarat om än med något olika detaljeringsgrad. Svaren har utgjort en bas för de diskussioner som ägde rum inom följande sex teman:

    • Konstruktion och mekanik

    • Geoteknologi

    • Vatten

    • Byggteknik, installationsteknik, akustik och brand

    • Management, ekonomi och juridik

    • Trafik

    Följande förslag framkom om fördjupat samarbete, samordning och effektivisering av verksamheten:

    • öka profileringen och samverkan i forskningen

    • utveckla och genomför ett nationellt forskarutbildningsprogram

    • samverka inom grundutbildningen avseende kursutveckling, litteratur och hjälpmedel

    • profilera grundutbildningen mellan högskolorna

    • samutnyttja laboratorieresurser

    • agera gemensamt i forsknings- och utbildningspolitiska frågor

    • samverka i EU-program

  • 156.
    Elfgren, Lennart
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Hagentoft, Carl-Erik
    Chalmers University of Technology.
    Stille, Håkan
    Kungliga tekniska högskolan, KTH.
    Thelandersson, Sven
    Lunds tekniska högskola, LTH.
    Kan högskolorna samarbeta...!2005In: V-byggaren : väg- och vattenbyggaren, ISSN 0283-5363, no 2, p. 38-40Article in journal (Other academic)
  • 157.
    Elfgren, Lennart
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    Horrigmoe, Geir
    Luleå University of Technology.
    Grennberg, Torsten
    Luleå University of Technology.
    Axelsson, Kennet B. E.
    Luleå University of Technology.
    Johansson, Bernt
    Institutionen för Anläggningsteknik - Verksamhetsberättelse 1985/861986Report (Other (popular science, discussion, etc.))
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  • 158.
    Elfgren, Lennart
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Jonasson, Jan-Erik
    Energetically Modified Cement (EMC) and Ordinary Portland cement (OPC): a comparison2000Report (Other academic)
  • 159.
    Elfgren, Lennart
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Jonasson, Jan-Erik
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Ronin, Vladimir
    High performance concrete with energetically modified cement (EMC)2004In: Proceedings International Symposium on Ultra-High Performance Concrete: Kassel, 13-15 Sept, 2004 / [ed] Michael Schmidt; E Fehling; Carsten Geisenhanslüke, Kassel: Kassel University Press GmbH, 2004, p. 93-102Conference paper (Refereed)
    Abstract [en]

    The demands of the modern building industry require development of new types of binder materials with improved properties for high and ultra high strength concretes and with significantly improved durability. They will provide new potential possibilities for the controlling of high performance concrete technology. In the Department of Civil Engineering at Luleå University of Technology a study of energetically modified cement (EMC) indicates that it is possible to obtain much more rapid hardening cement than the original cement used. As an example the strength of EMC-concrete increases about 100 per cent at the age of one day compared with a conventional high strength concrete.A new type of the cement gives possibilities to obtain required workability of the concrete mixtures with low water to binder ratios (w/B < 0.24) and achieve the strength levels up to 200 MPa with binder content not exceeding 550 kg/m3. The modification process used in this study means a special mechanochemical treatment in vibrating milling equipment of the blend containing Ordinary Portland Cement (OPC) and silica fume (SF), which increases the surface energy and the chemical reactivity of the newly obtained binder. This results in an accelerating effect, which maintains at least for nine months. According to ongoing investigations the energetically modified cement appears to give a considerable acceleration effect in the whole range of studied temperature. Concretes produced with EMC cement demonstrated very high durability at very severe testing conditions, including drying, saturation in sodium chloride solution and freezing-thawing. These results are very promising and it might be used in a lot of applications as winter concreting, precast element production, special structural elements, repair of buildings, rehabilitation, topping of concrete, floors, roads, etc.

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  • 160.
    Elfgren, Lennart
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    Jonsson, JohanTrafikverket.Karlsson, Mats D.Trafikverket.Rydberg-Forssbäck, LahjaTrafikverket.Sigfrid, BrittTrafikverket.
    IABSE Congress Stockholm, 2016: Challenges in Design and Construction of an Innovative and Sustainable Built Environment2016Conference proceedings (editor) (Refereed)
    Abstract [en]

    The conference aims to inspirre structural engineers and infrastructure managers to help forming and maintaing an innovative and sustainable built environment. The ernormous impact and long-time effect of the built environment motivates us to catch the opportunities that we have in front of us and help us ensure the best decisions by politicians and other decision makers.

    The proceeding contains 6 keynote presentations and more than 350 papers

  • 161.
    Elfgren, Lennart
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Karlsson, Inge
    Chalmers University of Technology, Department of Civil and Environmental Engineering.
    Studieresa till England våren 19701970Report (Other (popular science, discussion, etc.))
    Abstract [sv]

    En kortfattad redogörelse för en studieresa till England 1970-04-09--18 med besök vid Cement and Concrete Association (C&CA), City University, Building Research Establishement (BRE) och Imperial College

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  • 162.
    Elfgren, Lennart
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Karlsson, Inge
    Chalmers University of Technology, Department of Civil and Environmental Engineering.
    Studieresa till Nederländerna, Belgien, Frankrike, Schweiz och Västtyskland våren 19721972Report (Other (popular science, discussion, etc.))
    Abstract [sv]

    En kortfattad beskrivning av en studieresa 1972-03-03--04-16 till Nederländerna, Belgien, Frankrike, Schweiz och Västtyskland våren 1972 med besök vid olika byggforskningsinstitutioner.

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  • 163.
    Elfgren, Lennart
    et al.
    Division of Concrete Structures, Chalmers University of Technology, Göteborg, Sweden.
    Karlsson, Inge
    Division of Concrete Structures, Chalmers University of Technology, Göteborg, Sweden.
    Losberg, Anders
    Division of Concrete Structures, Chalmers University of Technology, Göteborg, Sweden.
    Nodal forces in the analysis of the ultimate torsional moment for rectangular beams1974In: Magazine of Concrete Research, ISSN 0024-9831, E-ISSN 1751-763X, Vol. 26, no 86, p. 21-28Article in journal (Refereed)
    Abstract [en]

    Equilibrium and work (energy) methods are reviewed for analysis of the ultimate torsional moment of rectangular under-reinforced concrete beams. In analogy with the yield-line theory for slabs, it is shown that the equilibrium method can be brought to complete agreement with the work method if nodal forces are introduced. The nature of the nodal forces in torsional analysis is discussed.

  • 164.
    Elfgren, Lennart
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    Karlsson, Inge
    Chalmers tekniska högskola.
    Losberg, Anders
    Chalmers tekniska högskola.
    Torsion-Bending-Shear Interaction for Concrete Beams: Closure of discussion1976In: Journal of the Structural Division, Proceedings of tha American Society of civil Engineers, ASCE, ISSN 0733-9445, Vol. 102, no ST1, p. 289-291Article in journal (Other academic)
    Abstract [en]

    Closure to discussion by Solanki, Pandit and Helmy of paper in J of the Structural Division, ASCE, Vol 100, ST8, August 1974, pp 1657-1676

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  • 165.
    Elfgren, Lennart
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Karlsson, Inge
    Cementa AB, Malmö.
    Losberg, Anders
    Div. of Concrete Structures, Chalmers Univ. of Tech., Göteborg.
    Torsion-bending-shear interaction for reinforced concrete beams1974In: Journal of the Structural division (1956-1982), ISSN 0044-8001, Vol. 100, no ST 8, Proc. Paper 10749, p. 1657-1676Article in journal (Refereed)
    Abstract [en]

    A rational, simple method is presented for analysis of the torsion-bending-shear interaction at failure for reinforced concrete beams. Equilibrium equations are studied for observed failure mechanisms. Three mechanisms can occur depending on where the concrete compression zone is formed: in the top (mode t), in the bottom (mode b), or in one vertical side (mode s). In modes t and b, the torsion-bending and the shear-bending interaction are governed by second-degree parabolas, whereas the torsion-shear interaction is governed by an ellipse. In mode s, the interaction surface is a cylinder with an elliptic base in the torsion-shear plane.

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  • 166. Elfgren, Lennart
    et al.
    Karlsson, Inge
    Losborg, Anders
    Torsion-bending-shear interaction for concrete beams-closure1976In: Journal of the Structural division (1956-1982), ISSN 0044-8001, Vol. 102, no 1, p. 289-291Article in journal (Refereed)
    Abstract [en]

    Closure to the discussion of Elfgren, L. , Karlsson, I. & Losborg, A. (1974) Torsion - bending - shear interaction for reinforced concrete beams in : Journal of the Structural division (1956-1982). 100, ST 8, Proc. Paper 10749, s. 1657-1676. 20 s

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  • 167.
    Elfgren, Lennart
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    Karlsson, Lennart Å S
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Product and Production Development. Tekniska fakultetsnämnden vid LuTH.
    Magnusson, Claes
    Tekniska fakultetsnämnden vid LuTH.
    Forskning och forskarutbildning vid Tekniska högskolan i Luleå: Strategisk Plan 1991-19951990Report (Refereed)
    Abstract [sv]

    Forskningen vid Tekniska högskolan i Luleå syftar till att vinna ny kunskap inom områden som är betydelsfulla för landet och regionen. Forskarutbildningen syftar till att utbilda licentiater och doktorer inom sådana områden.

    Under femårsperioden fram till och med 1995 bör den externfinansierade forskningen öka med 25 %. Vidare bör 5-10 europeiskla samarbetsprojekt etableras. För att uppmå dessa mål bör programarbete genomföras inom bland annat områdena datateknik, teknik för kallt klimat, material- konstruktions- och produktionsteknik, kvinnor och teknik samt miljöteknik.

    En plan bör även upprättas för ny- och återanskaffning av utrustning.

    En doktorsexamen och en licentiatexamen bör avläggas per tvåårsperid i varje professorsämne. För att klara detta bör varje ämne ha minst tre aktiva forskarstuderande. De forskarstuderande bör erbjudas god handledning, ett bra utbud av doktorandkurser och en god akademisk miljö.

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  • 168.
    Elfgren, Lennart
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    Linneberg, Poul
    COWI A/S, Lyngby, Denmark.
    Gudmundsson, Gudmundur Valur
    Vegagerdin - The Icelandic Road and coastal Administration.
    Leivo, Markku
    VTT Technical Research Centre of Finland.
    Köhler, Jochen
    Norwegian University of Science and Technology.
    Quality Control Plans for European Concrete Road Bridges: Experiences from Cooperation within COST Action TU 14062017In: Proceedings of the 23rd Nordic Concrete Research Symposium, Oslo, Norway, Oslo: Nordic Concrete Federation , 2017, p. 249-252Conference paper (Refereed)
    Abstract [en]

    The main objective of the COST Action TU1406 is to develop a guideline for the establishment of Quality Control plans for roadway bridges by integrating the most recent knowledge on performance assessment procedures. 36 European countries are working together in this endeavor during 2015-2019.

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  • 169.
    Elfgren, Lennart
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering.
    Lundberg, Bengt
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
    Nilsson, Bruno
    Belastningsutrustning: En redogörelse över inköp av en servohydraulisk belastningsutrustning för provning av material och konstruktioner vid Högskolasn i Luleå1976Report (Refereed)
    Abstract [sv]

    Servohydraulisk belastningsutrustning för 2,3 miljoner kronor upphandlades under 1975 till Högskolan i Luleå. Utrustningen består av tre drag- och tryckprovningsmaskiner (30, 200 och 300 kN), sex belastningscylindrar (130, 265 och 1000 kN), en bergmekanisk press (4500 kN), en processdator (16 kioord) samt elektronikkonsoler för styrning och registrering.

    Upphandlingsarbetet beskrivs och utrustningen presenteras.

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  • 170.
    Elfgren, Lennart
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    Nilforoush, Rasoul
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    Nilsson, Martin
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    Ohlsson, Ulf
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    Assessment of Fasteners to Concrete: A Tribute to Rolf Eligehausen2017In: Connections between Steel and Concrete: 3rd International Symposium / [ed] Akanshu Sharma and Jan Hofmann, Stuttgart, 2017, p. 1294-1302Conference paper (Refereed)
    Abstract [en]

    Some examples are given of assessment of fastenings to concrete structures and the work started by Rolf Eligehausen in fib Task Group 2.9 “Fastenings to structural concrete and masonry”. Studies have been made on e.g. the influence of creep on adhesive anchors and of surface reinforcement and size effects on headed anchors.

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  • 171.
    Elfgren, Lennart
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Noghabai, Keivan
    Luleå University of Technology.
    Anchor bolts and tension stiffening of rebars: two RILEM round robin investigations on bond1998In: Fracture mechanics of concrete structures.: Numerical models and analysis / [ed] Hirozo Mihashi, AEDIFICATIO Publishers , 1998, Vol. Vol. 2, p. 1279-1290Conference paper (Refereed)
    Abstract [en]

    Results from two RILEM Round Robin Investigations are presented. The first one deals with anchor bolts and the second one with bond and tension stiffening of rebars. Some 30 groups of researches encompassing over 70 people have performed more than 350 tests and analyses in America, Asia, Australia and Europe

  • 172.
    Elfgren, Lennart
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Noghabai, Keivan
    Luleå University of Technology.
    Tension of reinforced concrete prisms. Bond properties of reinforcement bars embedded in concrete tie elements. Summary of a RILEM round-robin investigation arranged by TC 147-FMB ‘Fracture Mechanics to Anchorage and Bond’2002In: Materials and Structures, ISSN 1359-5997, E-ISSN 1871-6873, Vol. 35, no 250, p. 318-325Article in journal (Refereed)
    Abstract [en]

    Results are presented from a RILEM Round Robin Investigation. It deals with tension stiffening of reinforcement bars embedded in concrete tie elements. Seven groups of researchers have performed some 50 tests and analyses. Parameters discussed are: cover thickness, crack spacing, bar size, tension stiffening of naked reinforcing bars, and influence of concrete strain softening.

  • 173.
    Elfgren, Lennart
    et al.
    Luleå University of Technology.
    Noghabai, KeivanLuleå University of Technology.
    Tension of reinforced concrete prisms: round robin analysis and tests on bond : a report from an investigation arranged by RILEM technical committee 147-FMB fracture mechanics to anchorage and bond2001Collection (editor) (Other academic)
    Abstract [en]

    Results are presented from a RILEM Round Robin Investigation. It deals with tension stiffening of reinforcement bars embedded in concrete tie elements. Seven groups of researches have performed some 50 tests and analyses. Parameters discussed are: cover thickness, crack spacing, bar size, tension stiffening of naked reinforcing bars, and influence of concrete strain softening. Similar trends were seen in the different tests and most of the applied theoretical models give reasonable results. The general behaviour is similar, although there seems to be some differences between the tested cracking loads. The models used are able to predict the bond behaviour in a correct way: analytical models based on the tension softening of concrete; bond-slip relations; as well as finite element methods with inner softening bands. The CEB-FIP Model Code can be used for design purposes and gives straight-forward predictions. The following new and/or refined insights were obtained from the tests: Cover thickness and crack spacing. - The number and spacing of visible cracks are more or less proportional to the thickness of the concrete cover. Bar diameter size effect. - There is a small tendency to a proportionally lower tension stiffening effect for larger bar sizes but the scatter is too large to secure definite conclusions. Longitudinal splitting and yielding of reinforcement. - Longitudinal splitting cracks occurred close to and after yielding of the reinforcement. Tension stiffening of naked reinforcing bars. - A new hypothesis of a tension stiffening of the bare reinforcing bar has been presented. Concrete strength and strain softening - The crack opening resistance is given by the tension softening curve of the concrete. By addition of fibres to the concrete matrix, the curve is changed, and the crack opening resistance is improved without necessarily changing other properties of the concrete. The chosen amount and type of fibers do not necessarily have much influence on the tensile strength, and the same crack patterns will be obtained on elements with the same geometry. The shape of the load-deformation curve, however, is considerably changed compared to that of the plain concrete. This is due to the enhanced crack-opening resistance, whereas the stiffening effect seems to depend on the crack spacing and consequently on the cover thickness and the degree of confinement it provides.

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  • 174.
    Elfgren, Lennart
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Noghabai, Keivan
    Ohlsson, Ulf
    Olofsson, Thomas
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Applications of fracture mechanics to anchors and bond1995In: Fracture mechanics of concrete structures: proceedings / [ed] Folker H. Wittmann, AEDIFICATIO Publishers , 1995, p. 1685-1694Conference paper (Refereed)
  • 175.
    Elfgren, Lennart
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Ohlsson, Ulf
    Anchor bolts modelled with fracture mechanics1992In: Applications of fracture mechanics to reinforced concrete: based on the papers presented at the International Workshop on the Applications of Fracture Mechanics to Reinforced Concrete, held in Turin, Italy, 6 October 1990, London: Elsevier, 1992, p. 267-283Chapter in book (Other academic)
  • 176.
    Elfgren, Lennart
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Ohlsson, Ulf
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Danielsson, Georg
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Åström, Lars
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Johansson, Håkan
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Paulsson, Björn
    Trafikverket.
    Töyrä, Björn
    Trafikverket.
    30 ton på Malmbanan. Rapport 3.3 Infrastruktur.: Forsknings- och utvecklingsprojekt avseende betongbroars bärighet1996Report (Refereed)
    Abstract [sv]

    I rapporten redovisas fältmätningar på fyra broar och provbelastning I laboratoriet av en bro

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  • 177.
    Elfgren, Lennart
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Ohlsson, Ulf
    Paulsson, Björn
    Töyrä, Björn
    Utmattningshållfasthet hos järnvägsbroar1997In: Bygg och Teknik, ISSN 0281-658X, E-ISSN 2002-8350, p. 48-Article in journal (Other (popular science, discussion, etc.))
  • 178.
    Elfgren, Lennart
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Olofsson, Jan
    Olofsson, Ingvar
    Paulsson, Björn
    Hållbara broar: ett europeiskt forskningsprojekt2005In: Betong, ISSN 1101-9190, no 1, p. 60-63Article in journal (Other (popular science, discussion, etc.))
  • 179.
    Elfgren, Lennart
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Olofsson, Thomas
    Emborg, Mats
    Jonasson, Jan-Erik
    High performance concrete structures: a Swedish research program1996In: Concrete in the service of mankind. 4, Radical concrete technology: proceedings of the international conference held at the University of Dundee, Scotland, UK on 24-26 June 1996 / [ed] Ravindra K. Dhir; Peter C. Hewlett, London: Taylor and Francis Group , 1996, Vol. 4, p. 141-150Conference paper (Refereed)
  • 180.
    Elfgren, Lennart
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Paulsson, Björn
    Banverket, Borlänge.
    Olofsson, Jan
    Skanska Teknik, Göteborg.
    Full-scale failure test of a reinforced concrete bridge in order to calibrate assessment models for load and resistance2008In: Proceedings, Nordic Concrete Research, Bålsta, Sweden: XXth Symposium on Nordic Concrete Research & Development ... The current proceedings contain 90 summaries of oral poster presentations] / [ed] Johan Silfwerbrand, Oslo: Norsk Betongforening , 2008, p. 58-59Conference paper (Refereed)
  • 181.
    Elfgren, Lennart
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Petersson, Per-Eric
    Wittmann, Folker H.
    Zaitsev, Yury
    Obituary: Arne Hillerborg January 4th 1923 - March 4th 20112012In: Restoration of Buildings and Monuments, ISSN 1864-7251, Vol. 18, no 2, p. 123-123Article in journal (Other academic)
    Abstract [en]

    Arne Hillerborg developed the strip method for design of reinforced concrete slabs and was a pioneer in Fracture Mechanics of Concrete Structures.

  • 182.
    Elfgren, Lennart
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    Sas, Gabriel
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    Andersson, Lars-Olof
    Trafikverket, Sweden.
    Enoksson, Ola
    Trafikverket, Sweden.
    Experiences from monitoring and assessment of bridges in northern Sweden: [Erfahrungen bei der Ûberwachung und Beurteilung von Brücken in Nordschweden]2024In: Internationale Arbeitstagung Brücken- und Ingenieurbau 2024: [International Conference on Bridges and Tunnels 2024] / [ed] Gero Marzahn, 2024, p. 116-123Conference paper (Refereed)
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  • 183.
    Elfgren, Lennart
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Schwartz, S E
    Fracture mechanics approaches to modeling the pullout of anchor bolts1992In: Concrete Design Based on Fracture Mechanics, Detroit: American Concrete Institute, 1992, p. 63-77Chapter in book (Other academic)
    Abstract [en]

    Summarizes and presents preliminary results of a round-robin analysis of anchor bolts organized by RILEM TC 90-FMA, Fracture Mechanics of Concrete-Applications. The analyses employed finite element models using fracture mechanics approaches for the most part. The assumptions used in establishing the material/cracking models varied with investigator and included linear elastic fracture mechanics (LEFM), the fictitious crack model (FCM) with linear softening or non-linear softening, a fixed crack line, a variable crack line with non-rotating cracks or rotating cracks. Crack propagation was determined using Mode I parameters, in some cases, with consideration of mixed mode behavior.

  • 184.
    Elfgren, Lennart
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Shah, Surendra P.
    Analysis of concrete structures by fracture mechanics: Proceedings of a RILEM Workshop dedicated to Professor Arne Hillerborg, Abisko, Sweden 19891991Collection (editor) (Other academic)
    Abstract [en]

    This book presents research findings of applications of fracture mechanics to concrete structures. Key papers from leading experts in the field describe existing and new modelling techniques in the analysis of materials and structures. The book explains the practical application of fracture mechanics to structural modelling, bending, shear, bond and anchorage. The proceedings of this RILEM Workshop is an important reference for those engaged in design, development, research and teaching in the field of concrete structures.

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  • 185.
    Elfgren, Lennart
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Söderlind, Gunnar
    Bonded anchors subjected to long time and cyclic loads1993In: Fracture and damage of concrete and rock : FDCR-2: proceedings of the second International Conference on Fracture and Damage of Concrete and Rock, Vienna, Austria, 9-13 November 1992 / [ed] H.P. Rossmanith, London: E & FN Spon, 1993, p. 513-526Conference paper (Refereed)
  • 186.
    Elfgren, Lennart
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Thelandersson, Sven
    Lunds tekniska högskola, LTH.
    Sundquist, Håkan
    Kungliga tekniska högskolan, KTH.
    Gylltoft, Kent
    Chalmers University of Technology.
    Stefan Attefall - våra synpunkter håller!2012In: Byggindustrin, ISSN 1104-5981, Vol. 2012, no 36, p. 32-32Article in journal (Other (popular science, discussion, etc.))
    Abstract [sv]

    Den 6 november slog professor från fyra tekniska högskolor larm om att ras och olyckor beror på grova fel i byggnadernas konstruktioner. I Byggindustrin 35-2012 avfärdadade bostadsminister Stefan Attefall (KD) deras kritik med att detta var en följd av gamla regler. Här bemöter de ministerns svar.

  • 187.
    Elfgren, Lennart
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Thun, Håkan
    Cyclic loading and long time behaviour of anchors2002In: Befestigungstechnik, Bewehrungstechnik und...: Festschrift zu Ehren von Prof. Dr. Ing. Rolf Eligehausen anläßlich seines 60. Geburtstages. Aktuelle Beiträge aus Forschung und Praxis, Stuttgart: Ibidem-Verlag, 2002, p. 147-152Chapter in book (Other academic)
  • 188. Elfgren, Lennart
    et al.
    Täljsten, Björn
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Externally bonded reinforcement1992In: Bond in concrete : from research to practice: international conference, Riga, Latvia, October 15 - 17, 1992, Riga Technical University , 1992, Vol. 1, p. 130-134Conference paper (Refereed)
  • 189.
    Elfgren, Lennart
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Täljsten, Björn
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Strengthening of conrete structures by externally bonded reinforcement steel plates1990In: Proceedings: Nordic Concrete Research Meeting : Trondheim 1990 / [ed] Jens Jacob Jensen, Oslo: Norsk Betongforening , 1990, p. 200-201Conference paper (Refereed)
  • 190.
    Elfgren, Lennart
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    Täljsten, Björn
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    Blanksvärd, Thomas
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    Load Testing as Part of Bridge Management in Sweden2019In: Load Testing of Bridges: Proof Load Testing and the Future of Load Testing / [ed] Eva O.L. Landsoght, London/Leiden: CRC Press, 2019, 1, p. 333-346Chapter in book (Refereed)
    Abstract [en]

    Load testing of new and existing bridges was performed regularly in Sweden up to the 1960ies. It was then abandoned due to high costs versus little extra information obtained. Most bridges behaved well in the serviceability limit range and no knowledge of the ultimate limit stage could be obtained without destroying the bridge. At the same time the methods for calculating the capacity developed and new numerical methods were introduced. Detailed rules were given on how these methods should be used. Some decommissioned bridges were tested to their maximum capacity to be able to study their failure mechanisms and to calibrate the numerical methods. In this paper some examples are given on how allowable loads have increased over the years and of tests being performed. Nowadays, load testing may be on its way back, especially to test existing rural prestressed concrete bridges, where no design calculations have been retained

  • 191.
    Elfgren, Lennart
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    Täljsten, Björn
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    Blanksvärd, Thomas
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    Sas, Gabriel
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    Nilimaa, Jonny
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    Bagge, Niklas
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering. WSP, Luleå, Sweden.
    Tu, Yongming
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    Puurula, Arto
    Savonia University of Applied Sciences, Kuopio.
    Häggström, Jens
    Trafikverket, Luleå, Sweden.
    Paulsson, Björn
    Charmec, Chalmers University of Technology.
    Load-testing used for quality control of bridges2018In: Quality Specifications for Roadway Bridges: Workshop of COST TU 1406 / [ed] José Matos, 2018, p. 1-6Conference paper (Refereed)
    Abstract [en]

    Load testing is a way to control the capacity and function of a bridge. Methods and recommendations for load testing are described and examples are given form tests carried out. In order not to damage the bridge being tested, the load must be limited, often to be within the serviceability limit state (SLS). Numerical models can be calibrated by load tests and then be used to check the carrying capacity for higher loads than what has been tested. Need for further work and recommendations are discussed. By effective planning costs can be saved and a more sustainable use of bridges can be obtained.

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  • 192. Elfgren, Lennart
    et al.
    Täljsten, Björn
    Carolin, Anders
    Eriksen, Jörgen
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Guidelines for strengthening of railway bridges2009In: Proceedings of Workshop: COST Action C25 : Sustainability of Constructions - Integrated Approach to Life-time Structural Engineering / [ed] Luís Bragança, 2009, p. 141-145Conference paper (Refereed)
    Abstract [en]

    In the international project "Sustainable Bridges", one of the deliverables is a design guide for strengthening of bridges. This paper gives the reader a first look into this guidelinewhich can be found at the projects website: www.sustainablebridges.net

    Download full text (pdf)
    FULLTEXT01
  • 193.
    Elfgren, Lennart
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    Ulriksen, Peter
    Lunds tekniska högskola, Sweden.
    Infrastrukturprogrammet Väg-Bro-Tunnel: Syntesrapport 1996 - 20072008Report (Other academic)
    Abstract [sv]

    Vetenskap – Kunskapspositionerna har flyttats fram beträffande planering, byggande och underhåll av väger, broar, dammar och tunnlar. 21 doktors- och 24 licentiatexamina har avlagts och ytterligare 4 doktors- och 5 licentiatexamina planeras under 2008.  Målen för avhandlingarna är i de flesta fall mycket relevanta och ambitiösa. Tankeväckande hypoteser har ställts upp och prövats. Den vetenskapliga metoden har oftast bestått av en omfattande litteraturundersökning följd av laboratorie- och/eller fältförsök, där uppställda hypoteser prövats. Resultaten har sedan analyserats med avancerade teoretiska modeller och värdefulla slutsatser har dragits. De flesta arbetena har mycket god kvalitet, innehåller många originella bidrag och bedöms få stor betydelse för den fortsatta vetenskapliga utvecklingen inom respektive ämnesområde.

    Genom programmet har Sveriges medverkan stärkts i det europeiska forskningssamarbetet i EU.

    Näringsliv - Bygg- och infrastruktursektorn inom svenskt näringsliv har genom programmet tillförts 38 forskarutbildade ingenjörer. Detta ger ökad kompetens och konkurrenskraft. Programmets visioner var att reducera byggtid och livscykelkostnader för broar och vägar, att introducera effektiva diagnos-, reparations- och förstärkningssystem för broar och dammar samt att bli världsledande inom tunneldrivning. Dessa visioner håller nu på att uppfyllas. Ett huvudmål var även att utveckla en industrialiseringsprocess inom infrastrukturområdet för att effektivisera byggandet. Här har stora steg framåt tagits.

    Samhälle - Ett aktivt nätverk har byggts mellan deltagande personer, företag och universitet som stärker Sveriges konkurrenskraft och påskyndar utvecklingen mot ett effektivt, innovativt, marknadsinriktat tjänstesamhälle.

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    Väg-Bro-Tunnel sysntesrapport
  • 194.
    Elfgren, Lennart
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Utsi, Sofia
    Thun, Håkan
    Spruckna betongsliprars bärförmåga vid utmattande last2003Report (Other academic)
    Abstract [en]

    Concrete sleepers cracked due to delayed ettringite formation have been exposed to fatigue loading. The applied load has been varied between 20 and 62,5 kN where 62,5 kN corresponds to an axle load of 25 tons. 6 of 13 tested sleepers failed after 223 to 136 670 load cycles. 7 of 13 sleepers managed to carry more than 2 million load cycles, which is equivalent to train traffic for about 7 years. The most common type of fracture is bond failure between the wires and the concrete. It is not possible to determine the quality of the bond strength through visual inspections since no relation between the outer and the inner crack pattern has been found. All tested sleepers were classified as red sleepers (severe cracking).

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    FULLTEXT01
  • 195.
    Elfgren, Lennart
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Vallgren, Annika
    Byggdag i Luleå: Tekniska Högskolan jubilerade1991In: Tidningen Byggindustrin, ISSN 0349-3733, no 35, p. 30-Article in journal (Other (popular science, discussion, etc.))
  • 196.
    Elfgren, Lennart
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    Veljkovic, Milan
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    Projekt: Centrum för riskanalys och riskhantering, CRR2012Other (Other (popular science, discussion, etc.))
    Abstract [sv]

    En centrumbildning vid LTU i samarbete med näringsliv och samhälle för studier av riskanalys och riskhantering

  • 197. Emborg, Mats
    et al.
    Cederwall, Krister
    Elfgren, Lennart
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Fatigue strength of cable couplers in prestressed concrete beams1982In: Nordic Concrete Research, ISSN 0800-6377, Vol. 1, p. 5.1-5.14Article in journal (Refereed)
    Abstract [en]

    Fatigue tests have been carried out on ten prestressed concrete beams. Six of the beams were furnished with a cable coupler in the mid-span and four beams had no cable coupler. The uncoupled beams could in some cases sustain 9 times as many load cycles as the coupled beams. Some probable causes to the coupled beams lower fatigue strength are discussed in the paper.

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  • 198. Enochsson, Ola
    et al.
    Elfgren, Lennart
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Broar längs Haparandabanan: mätning och utredning av dynamisk faktor2006Report (Other academic)
    Abstract [sv]

    Outokumpu önskar kunna framföra sina transporter med stål längs Haparandabanan (BDL 136) med (största tillåtna axel last) STAX 25 ton och (största tillåtna vikt per meter) STVM 7,2 ton/m, med minsta hastighet uppgående till 40 km/h. Banan trafikeras i nuläget endast med godståg framförda av GreenCargo. Vid översynen av minimiåtgärder för tillåtelse av trafiklaster (BV3) motsvarande STAX 25 ton och STVM 7,2 ton/m har det konstaterats att 5 av broarna inte klarar kraven på tillåtna axellaster. De aktuella broarna är uppräknade från söder till norr: bro över Stryckån, bro över Kalix älv, bro över Stråkan, bro över Kukasjokk och bro över Keräsjokk. Ett antal olika kritiska delar har identifierats i broarna, både i form av primärt och sekundärt bärande konstruktionselement. För de primärt bärande balkarna är det utmattningskapaciteten hos de nitade förbanden som är för låg. En bidragande orsaker till detta är bl a trafiklastens dynamiska tillskott. För de sekundärt bärande konstruktionselement såsom slingerförband och vindförband har sidokraften stor negativ inverkan på kapaciteten. Av dessa fenomen är det dynamiska tillskottet möjligt att bestämma genom mätning, medan vind och sidostöt i det närmaste är omöjliga att bestämma. Å andra sidan kan mindre överskridanden av kapaciteten för sekundärt bärande balkar tillåtas om täta inspektioner genomförs. Klassningsberäkningarna för de 5 broarna visar i medeltal på att det dynamiska tillskottet till trafiklasten uppgår till ca 10 % för huvudfackverken, 30 % för tvärbalkarna och 37 % för långbalkarna vid en maximal hastighet av 60 km/h. Beräkningarna är utförda enligt BV Bärighet (2000). I denna rapport redovisas mätningar utförda vid samtliga 5 broar under 2006. Mätningarna har avsett att bestämma den dynamiska förstoringsfaktorn för huvudfackverken vid samtliga broar. Vid tre av broarna har dessutom försök gjorts för att bestämma den dynamiska förstoringsfaktorn för en långbalk. Försök gjordes även till att bestämma förstoringsfaktorn för en tvärbalk vid två av broarna. Mätningarna utfördes med optiska laserbaserade lägessensorer för registrering av vertikala och horisontella rörelser i mitten av respektive bros huvudfackverk, och lägesgivare av typen LVDT ("linear voltage displacement transducer") för registrering av utböjningar i mitten av lång- och tvärbalk. Under den sista mätningen av bro över Keräsjokk, användes dessutom ett antal svetsade töjningsgivare för registrering av töjningar i mitten av en långbalk och en tvärbalk. Mätningarna visar i överlag på låga dynamiska förstoringsfaktorer för samtliga broar för reespektive beaktade delar. Viss osäkerhet finns dock i noggrannheten när det gäller mätningar med lägesgivarna. För de optiska laserbaserade lägesgivarna utgörs osäkerheten främst av sensorernas noggrannheten med avseende på avstånd och påverkan av väderförhållandena vid mättillfället. För LVDT-sensorerna utgörs osäkerheterna främst av uppkomna egensvängningar av mätbalk som monterats relativt till vid tillfället beaktad balks ändinfästning, samt mätbalkens rörelser i sidled i kombination av ett inte helt vertikalt läge av mätmothåll på mätbalk dvs den relativa nivån kan förändrats vid en sidorörelse. Mätningarna med töjningsgivarna visar däremot på stabila och repeterbara värden. Dessa mätningar visar inte på någon ökning av påkänningar för en tvärbalk vid hastigheter upp till 60 km/h. För långbalken ökar enbart påkänningen på den dragna sidan av balken vid en sussessivt ökande hastighet. Resultaten tyder på att ökningen éndast beror på huvudfackverkets nedböjning som indirekt resulterar i en jämnt fördelad dragkraft i långbalkarna.

  • 199.
    Enochsson, Ola
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    Elfgren, Lennart
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    Johansson, Håkan E
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    Ojanen, Johan
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    Emborg, Mats
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    Tillståndsbedömning av järnvägsbro över Byske älv vid Myrheden, Bandelen Bastuträsk – Nyfors, km 1031+9372010Report (Refereed)
    Abstract [sv]

    Järnvägsbron över Byske Älv vid Myrheden är en bågbro av betong som färdigställdes 1941. Bågen har en spännvidd av 39,2 m och den totala längden är 59,6 m. Bågen blev fläckvis frysskadad i samband med gjutningen och har reparerats med ca 10 års mellanrum. År 2003 upptäcktes ånyo betongskador i underkant på bågen. Den dåliga betongen bilades bort och ersattes med torrbruk som sprutades på plats. Efter reparationen bedömdes bron kunna klara tåglast BV-2 (25 tons axellast och 7,2 ton/m utbreddlast). För att bedöma brons fortsatta livslängd och bärförmåga har Avd för Byggkonstruktion vid LTU tagit del avtidigare tillståndsbedömningar och besiktigat bron 2009-02-13 och 2009-08-25--26. Bron visade sig vara i förhållandevis gott skick. Vi bedömer att den kan klara tåglast BV-2 i ytterligare fem år under förutsättning att den hålls under uppsikt och att en närmare utredninggörs av gjutfogarna i bågen under skivstöden och av skivstödens ledformade anslutningar mot bågen. Bron borde hålla i 20 år eller mer om ballasten rensas från finare grusfraktioner så att dräneringen förbättras. Vattenavledningen från bron bör vidare ordnas så att vatten från brobanan förhindras rinna ner längs bågen och bidra till frost- och korrosionsangrepp. Dessutom bör dålig/skadad betong vattenbilas bort och ersätts med pågjutning av ny betong.

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    Bro Byske Älv
  • 200.
    Enochsson, Ola
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Elfgren, Lennart
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Kronborg, Anders
    Banverket.
    Paulsson, Björn
    Banverket.
    Assessment and monitoring of an old railway steel truss bridge in northern Sweden2008In: Bridge Maintenance, Safety Management, Health Monitoring and Informatics: Proceedings of the Fourth International Conference on Bridge Maintenance, Safety and Management, July 13-17 2008, Seoul, Korea - IABMAS '08 / [ed] Hyun-Moo Koh; Dan G Frangopol, Boca Raton, Fla: Taylor and Francis Group , 2008, p. 3617-3624Conference paper (Refereed)
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