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PROCEEDINGS OF THE TWELFTH INTERNATIONAL CONFERENCE ON COMPUTATIONAL STRUCTURES TECHNOLOGY
Influence of the Ballasted Track on the Dynamic Properties of a Truss Railway Bridge
L. Bornet1, A. Andersson1, J. Zwolski2 and J.-M. Battini1
1Department of Civil and Architectural Engineering, KTH Royal Institute of Technology, Stockholm, Sweden
L. Bornet, A. Andersson, J. Zwolski, J.-M. Battini, "Influence of the Ballasted Track on the Dynamic Properties of a Truss Railway Bridge", in , (Editors), "Proceedings of the Twelfth International Conference on Computational Structures Technology", Civil-Comp Press, Stirlingshire, UK, Paper 185, 2014. doi:10.4203/ccp.106.185
Keywords: ballast, railway bridges, experimental dynamics, finite element modelling..
This paper presents numerical and experimental analyses of a steel truss railway bridge. The main interest of this work is that dynamic experiments have been performed before and after the ballasted track was placed on the bridge. Consequently, it has been possible to quantify the effect of the ballast and the rails on the dynamic properties of the bridge. For that, two finite element models, with and without the ballasted track, have been implemented and calibrated using the experimental results. It appears that the ballast gives an additional stiffness of about 25-30% for the lowest three eigenmodes. This additional stiffness can be only partly explained by the stiffness of the ballast. In fact, it seems that this additional stiffness also results from a change of the support conditions.
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