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International Journal of Railway Technology
IJRT, Volume 3, Issue 2, 2014
Analysis of Slab Frame Bridges for High-Speed Trains: Practical Modelling Aspects
M. Solat Yavari1,2, C. Johansson1,2, C. Pacoste1,2 and R. Karoumi2
1ELU Konsult AB, Stockholm, Sweden
M. Solat Yavari, C. Johansson, C. Pacoste, R. Karoumi, "Analysis of Slab Frame Bridges for High-Speed Trains: Practical Modelling Aspects", International Journal of Railway Technology, 3(2), 23-38, 2014. doi:10.4203/ijrt.3.2.2
Keywords: slab frame bridge, high-speed train, acceleration, soil-structure interaction, wing walls, finite element analysis.
The study, described in this paper, investigates the maximum vertical deck acceleration of single-span slab frame railway bridges. It employs the parametric study based on a real data bank of typical bridges in Sweden. Under the design assumptions based on the Swedish code for railway bridges, this research has three main aims. The first aim is to study the effect of wing walls on the dynamic response of the bridges. The second is to study how varying soil stiffness affects the acceleration. The last is to make a simple comparison, with respect to bridge deck acceleration, between two-dimensional and three-dimensional models. Comparison between the results obtained shows that wing walls noticeably reduce the dynamic acceleration, and two-dimensional models give lower acceleration compared to three-dimensional models but not less than 50%. Moreover, acceleration, particularly in relatively larger bridges, is not affected by the soil stiffness when the soil stiffness passes a certain level. These conclusions can be used in a quick and time-saving way in practical situations for predicting and improving the dynamic response of bridges.
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