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  • 1.
    Al-Emrani, Mohammad
    et al.
    Chalmers University of Technology.
    Lukic, Mladen
    CTICM.
    Nilsson, Mattias
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Bridge fatigue guidance: a European research project2009In: Sustainable infrastructure: environment friendly, safe and resource efficient ; proceedings of IABSE symposium, Bangkok, Thailand, Sept. 9 - 11, 2009 / [ed] Mahāvidyālăy Culālaṅkărṇ, Zürich: International Association for Bridge and Structural Engineering, 2009Conference paper (Refereed)
  • 2.
    Collin, Peter
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Möller, Mikael
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Nilsson, Mattias
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Törnblom, Svante
    Luleå tekniska universitet.
    Undermatching butt welds in high strength steel2009In: Sustainable infrastructure: environment friendly, safe and resource efficient ; proceedings of IABSE symposium, Bangkok, Thailand, Sept. 9 - 11, 2009 / [ed] Mahāvidyālăy Culālaṅkărṇ, Zürich: International Association for Bridge and Structural Engineering, 2009, p. 280-281Conference paper (Refereed)
  • 3.
    Feldmann, M.
    et al.
    Rheinisch-Westfälische Technische Hochschule Aachen (RWTH).
    Naumes, J.
    Rheinisch-Westfälische Technische Hochschule Aachen (RWTH).
    Pak, D.
    Rheinisch-Westfälische Technische Hochschule Aachen (RWTH).
    Veljkovic, Milan
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Nilsson, Mattias
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Eriksen, J.
    Luleå tekniska universitet.
    Collin, Peter
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Kerokoski, O.
    Ramböll Sverige AB (Ramböll).
    Pétursson, Hans
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Verstraete, M.
    Université de Liège.
    Vroomen, C.
    Université de Liège.
    Haller, M.
    ArcelorMittal Belval & Differdange (AM R & D).
    Hechler, O.
    ArcelorMittal Belval & Differdange (AM R & D).
    Popa, N.
    ArcelorMittal Belval & Differdange (AM R & D).
    Economic and durable design of composite bridges with integral abutments2010Report (Refereed)
    Abstract [en]

    In the design and construction of bridges, questions of sustainability, maintenance and durability are becoming more and more important for European road administrations, in addition to safety and serviceability issues. Therefore integral abutment bridges are becoming highly attractive to designers, constructors and road administrations, as they tend to be less expensive to build, easier to maintain and more economical to own over their life time. Bearings and joints are main sources of maintenance costs during a lifetime. These costs vanish because the bridges are joint- and bearing-free. However, this very advantage complicates the design compared to conventional bridges in some crucial respects. Combined with the fact that most European countries have only limited experience with integral bridges to date, this leads to a reluctance of road administrations to use this bridge type. Thus the main objective of the project is to experimentally and theoretically investigate the behaviour of critical points of integral abutment bridges. Regarding the soil-structure interaction, recommendations are elaborated based on monitoring results as well as previous research and monitoring campaigns. Conventional HP piles and sheet piles are investigated as a foundation. Furthermore a hinged HP connection is developed to decrease the stresses in the pile system. An investigation of the design and construction of the slab to pavement approach is also carried out to avoid major damages to the structure. Finally the most important information is condensed into the essential features in form of a 'Design guide for composite bridges with integral abutments'

  • 4.
    Nilsson, Mattias
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Secondary strain in web stiffeners in steel and composite bridges2012Licentiate thesis, comprehensive summary (Other academic)
    Abstract [sv]

    Sommaren 2006 så upptäcktes ett flertal sprickor på bron över Vårby fjärden i närheten av Stockholm. Samtliga sprickor syntes ha uppstått i svetsar som förbinder vertikala livavstyvningar med huvudbalkarnas överflänsar. På uppdrag av Trafikverket så har en utredning genomförts med syftet att klarlägga orsaken till sprickornas uppkomst. Utredningen omfattande bl.a.-Töjningsmätningar på bron. -Delskadeberäkningar enligt Palmgren-Miner och utförda på basis av långtidsmätningarna-Finita element analyser-Mikroskopanalyser av bit av en svets med en sprickyta-Tester utförda på en mindre samverkansbro vid Luleå Tekniska Universitet (LTU)Resultatet av utredningen påvisar entydigt att orsaken till sprickorna är utmattning. De för utmattning relevanta spänningarna tros vara resultatet av påtvingade rotationer på styva livavstyvningar och tvärförband. Rotationerna uppstår då betongfarbanan böjer sig för tunga fordon. Med all rimlig visshet så förbisågs denna sekundära effekt när bron konstruerades.Tester på en mindre samverkansbro har utförts vid Luleå tekniska Universitet. Två olika typer av tvärförband testades. Testerna och resultatet av dessa beskrivs i uppsatsen.På basis av resultatet av Vårby-utredningen samt av utförda tester vid LTU, och med ett syfte att minska sannolikheten för liknande sprickbildningar, så har ett antal detaljutformningar utvärderats. Vidare så föreslås en enkel metod för utvärdering av kritisk spänningsvidd i livavstyvningar.

  • 5.
    Nilsson, Mattias
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Collin, Peter
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Eriksson, Kjell
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
    James, Gerard
    Projektengagemang i Stockholm AB.
    The instrumentation and monitoring of the Vårby Bridge2010In: Large structures and infrastructures for environmentally constrained and urbanised areas: IABSE symposium, Venice 2010 ; [34th International Symposium on Bridge and Structural Engineering, Venice, Italy, September 22 - 24, 2010] / [ed] Anton Steffen, International Association for Bridge and Structural Engineering, 2010Conference paper (Refereed)
    Abstract [en]

    Numerous cracks have been discovered in the Vårby Bridge near Stockholm, Sweden. All cracks are found at the junctions between cross girders and the main girders, more specifically, at the welds connecting the vertical web stiffeners to the top flanges of the main girders. In order to identify the reason for the observed cracks, an ongoing investigation under the commision of the bridge owner was started in the spring of 2009. One conclusions so far is that the observed cracks are to 100 % certainty a result of fatigue.FEM-modeling is currently going on as a part of a master thesis. As the fatigue process is distortional the propagation phase of the observed cracks might slow down or even stop. One task will thus be to determine the stress intensity factor versus crack length relationship in order to model a growing crack. Suggestions of possible of methods of refurbishment, based upon the results, will then be presented to the bridge owner.

  • 6.
    Thulstrup, Michael B.
    et al.
    MT Höjgaard a/s.
    Nilsson, Mattias
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Hällmark, Robert
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Nielsen, Jens P.
    Promecon a/s.
    Design, fabrication and construction of railway bridge over Södertälje canal2009In: Nordic Steel Construction Conference: Proceedings : September 2.-4., 2009, Malmö, Sweden, Stockholm: Stålbyggnadsinstitutet , 2009, p. 128-137Conference paper (Refereed)
  • 7. Collin, Peter (Editor)
    Nilsson, Mattias (Editor)
    Veljkovic, Milan (Editor)
    International Workshop Strengthening of Steel Bridges: Topics of relevance for the BRIFAG project2011Report (Other academic)
1 - 7 of 7
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