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  • 1.
    Leander, John
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges.
    Skoglund, Oskar
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges.
    A calibrated verification model for fatigue assessment of road bridges2019In: Proceeding of Nordic Steel 2019, 2019Conference paper (Refereed)
    Abstract [en]

    The format suggested in the Eurocode for fatigue verification of road bridges is under scrutiny in thispaper. The model is easy to use in practice, which is important for design purposes, but its accuracyhas been questioned. For this reason, a reliability-based evaluation of the safety level has beenperformed and is briefly recapitulated in this paper. It shows a large scatter in reliability index rangingfrom unacceptably low to overly conservative. A calibration of the existing model has been performedshowing a more consistent reliability level. Results from comparisons of the existing and calibratedmodels are shown for real bridges considering the influence on design stress ranges. The results showthat the Eurocode model is conservative for short span bridges subjected to low traffic volume. Forother cases, the Eurocode model is non-conservative.

  • 2.
    Skoglund, Oskar
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges.
    Innovative structural details using high strength steel for steel bridges2019Licentiate thesis, comprehensive summary (Other academic)
    Abstract [en]

    The use of high strength steel has the potential to reduce the amount of steel used in bridge structures and thereby facilitate a more sustainable construction. The amount of steel and what steel grade that can be used in bridge structures and other cyclic loaded structures are often limited by a material degradation process called fatigue. The fatigue resistance of steel bridges are to a large extent depending on the design of structural details and connections. The design engineer is limited by a few pre-existing structural details and connections – with rather poor fatigue resistance – to choose from when designing steel bridges, and is therefore often forced to increase the overall dimensions of the structure in order to cope with the design requirements of fatigue. This licentiate thesis aims at increasing the fatigue resistance of fatigue prone structural details and connections by implementing new and innovative structural solutions to the already pre-existing details given in the design standards. A typical fatigue prone detail is the vertical stiffener at an intermediate cross-beam, which will be in focus. By improving the fatigue resistance, less steel material will be required for the construction of new steel bridges and composite bridges of steel and concrete. It is shown in this thesis and the appended papers that the use of high strength steel for bridge structures can considerably reduce the amount of steel used, the steel cost and the harmful emissions. However, this is only true if the fatigue strength of critical details can be substantially improved. Furthermore, a few new and innovative structural details and modifications to already existing details are proposed in this thesis and in the appended papers, that have the potential to increase the fatigue resistance of steel bridges and composite bridges of steel and concrete. However, further analyses are required in order to make these structural details viable for construction.

  • 3.
    Skoglund, Oskar
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges.
    Leander, John
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges.
    The impact of local geometry on the fatigue life of a welded structural detail2019In: Proceeding of Nordic Steel 2019, 2019Conference paper (Refereed)
    Abstract [en]

    Fatigue often limits the capacity of welded steel bridges, and thus often governs the amount of steel required. The fatigue life is, to a large extent, governed by stress concentrations and the magnitude is controlled by local as well as global geometry; by improving the local geometry the stress raising effects can be lowered and by increasing the global dimensions the nominal stress can be reduced. The fatigue assessment format presented in the Eurocode gives little or no room for the designer to control the local geometry of the structural detail, and is often left with increasing the overall dimensions in order to improve the fatigue life of the structure. This paper aims at investigating the possible impact on the fatigue life of welded steel structures by different weld geometries. In this paper a vertical stiffener will be studied by fracture mechanics. The study showed that significant improvements in fatigue life can be made by small changes to the weld geometry and the most pronounced effect was by changing the weld toe radius, and

  • 4.
    Skoglund, Oskar
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges.
    Leander, John
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges.
    Karoumi, Raid
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges.
    Optimizing the steel girders in a high strength steel composite bridgeIn: International Journal of Steel Structures, ISSN 1598-2351, E-ISSN 2093-6311Article in journal (Refereed)
    Abstract [en]

    The use of high strength steel has the potential to reduce the amount of steel used in bridges and thereby, facilitate a more sustainable construction. In this study, an optimization of a composite steel and concrete bridge is presented. The study aimed at identifying the potential benets of using high strength steel, compared to conventional steel, in terms of weight, material cost and environmental impact. The optimization routine followed what is outlined in the Eurocode and satised both ultimate and serviceability limit state conditions, with exception of fatigue. To study the inuence of fatigue a separate verication was performed on the solutions found from the optimization. The study showed that substantial savings in weight, environmental impact and material cost could be made by implementing high strength steel. However, when the fatigue verication according to Eurocode was considered, the potential benets of using steels of higher grade vanished completely.

  • 5.
    Skoglund, Oskar
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges.
    Leander, John
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges.
    Karoumi, Raid
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges.
    Overview of steel bridges containing high strength steel material2019In: International Journal of Steel Structures, ISSN 1598-2351, E-ISSN 2093-6311Article in journal (Refereed)
    Abstract [en]

     The use of high strength steel has the potential to reduce the amount of steel used in bridges and thereby, facilitate a more sustainable construction. A survey of existing bridges built using high strength steel is presented in this paper with emphasis on the Swedish bridge stock. The survey aimed at identifying the steel grades that were used and where in the cross-section they have been used. A case study on the inuence of fatigue shows that today's regulations make it more dicult to use high strength steel in comparison to previous regulations.

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