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  • 1.
    Axelsson, Erik
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges.
    Syk, Annelie
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges.
    Ülker Kaustell, Mahir
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges.
    Battini, Jean-Marc
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges.
    Effect of axle load spreading and support stiffness on the dynamic response of short span railway bridges2014In: Structural Engineering International, ISSN 1016-8664, E-ISSN 1683-0350, Vol. 4, p. 457-465Article in journal (Refereed)
    Abstract [en]

    In dynamic analyses of railway bridges, the train axle loads are often modeled as moving point forces. However, one effect of the ballast is to spread these point forces. This can lead to large reductions of the bridge response, especially for short span bridges. For this reason, Eurocode prescribes to distribute the axle loads over three adjacent sleepers. In this paper, the axle load distribution is first studied using a plane finite element analysis and based on that, a triangular load distribution is proposed. Then, numerical simulations are performed to compare the effect of this load distribution with the Eurocode one. Both simply supported bridges and bridges with integrated backwalls, all with span lengths less than 10m, are studied. For the later bridges, the effect of the stiffness of the foundation has been studied by adding springs at the supports.

  • 2.
    Höglund, Torsten
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges.
    Nilsson, Lars
    Swedish Defence Material Administration .
    Aluminium in Bridge Decks and in a new Military Bridge in Sweden2006In: Structural Engineering International, ISSN 1016-8664, E-ISSN 1683-0350, Vol. 16, no 4, p. 348-351Article in journal (Refereed)
    Abstract [en]

    In this paper two different types of aluminium bridges in Sweden are presented: 1) Aluminium extrusion deck system for rehabilitation of road bridges 2) A military bridge for the armoured vehicle launched bridge system. Aluminium extrusion deck system for rehabilitation of road bridges has been developed as the deterioration of road bridges has becoming a serious problem in many Nordic countries. An increasing number of bridge decks are in such a poor condition that they must be replaced. This is mainly due to severe climate, the use of road salt in winter time and increasing traffic and load.

  • 3.
    Höglund, Torsten
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges.
    Norlin, Bert
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges.
    Static Design of Aluminium Structures2006In: Structural Engineering International, ISSN 1016-8664, E-ISSN 1683-0350, Vol. 16, no 4, p. 301-304Article in journal (Refereed)
    Abstract [en]

    This paper shows how the effective thickness concept is used in Eurocode 9 (prEN 1999-1-1 Design of aluminium structures, general structural rules [1]) to allow for local buck ling as well as strength reduction in the heat affected zone (HAZ) of welded members.

  • 4. Larsson, Oskar
    et al.
    Karoumi, Raid
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Design and Bridges (name changed 20110630).
    Modelling of climatic thermal actions in hollow concrete box cross-sections2011In: Structural Engineering International, ISSN 1016-8664, E-ISSN 1683-0350, Vol. 21, no 1, p. 74-79Article in journal (Refereed)
    Abstract [en]

    The temperature distribution in concrete structures varies as a result of fluctuations in solar radiation, air temperature, wind speed and long-wave radiation. Variations in temperature may cause longitudinal and transverse movements. If these movements are restrained, stresses and strains can be induced, which may contribute to cracking in the structure. To predict such thermal actions in a hollow concrete section, a finite element (FE) model was developed. Hourly resolution of climatic input data was used in the FE model to capture the daily temperature variations in the structure. The FE model was validated against temperature measurements performed in the hollow concrete arch of the New Svinesund Bridge located at the border between Sweden and Norway. To be able to use the developed model for future studies of other structures, an iterative method to consider the inside cavity air was also developed. The results of the simulations show that the model can capture the daily temperature variations. In addition, the proposed model shows acceptable agreement with the measurements from the bridge, and the calculated linear temperature differences for the bridge show good agreement with the design values in the Eurocode. The model is well suited for predicting temperature distributions and can be used for further studies of bridges, including those with box cross-sections, as well as for other concrete structures.

  • 5.
    Pettersson, Lars
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges.
    Flener, Esra Bayoglu
    Sundquist, Håkan
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges.
    Design of Soil-Steel Composite Bridges2015In: Structural Engineering International, ISSN 1016-8664, E-ISSN 1683-0350, Vol. 25, no 2, p. 159-172Article in journal (Refereed)
    Abstract [en]

    The research work presented in this paper deals with what are commonly known as soil-steel flexible culverts. The word culvert is, however, usually associated with small pipes in road embankments. Over the years, the flexible culverts have grown bigger and today they are what one could call bridges; they are not just culverts anymore. A more proper name today would therefore be Soil-Steel Composite Bridges. This explains the title of the paper. The research work has been ongoing for more than 30 years at the Department of Civil and Architectural Engineering, Division of Structural Engineering and Bridges, at KTH Royal Institute of Technology in Stockholm, Sweden. Realizing that spans have grown larger and heights of cover smaller, the aim was to develop a design method that could be used in everyday design work. The design method developed, based on theoretical studies as well as several full scale tests, is today a code requirement in Sweden, Finland, and Norway and is also in use in several other countries in Europe. This paper describes the design method itself and the development behind it as well as ongoing research and planned future developments.

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