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Civil-Comp Proceedings
ISSN 1759-3433
CCP: 98
Edited by: J. Pombo
Paper 105

Evaluating the Performance of Three Dimensional Finite Element Modelling of High-Speed Trains

A. El Kacimi, P.K. Woodward, O. Laghrouche and G. Medero

Institute for Infrastructure and Environment, School of the Built Environment, Heriot-Watt University, Edinburgh, United Kingdom

Full Bibliographic Reference for this paper
A. El Kacimi, P.K. Woodward, O. Laghrouche, G. Medero, "Evaluating the Performance of Three Dimensional Finite Element Modelling of High-Speed Trains", in J. Pombo, (Editor), "Proceedings of the First International Conference on Railway Technology: Research, Development and Maintenance", Civil-Comp Press, Stirlingshire, UK, Paper 105, 2012. doi:10.4203/ccp.98.105
Keywords: finite element, ground dynamics, high speed trains.

The track ground dynamic response induced by the passage of high speed trains is studied based on a three-dimensional finite element coupled train-track model. Particular emphasis is placed on the investigation of the effect of the train fundamental passing frequency on the level of ground vibration, when it exceeds the ground cutoff frequency, as the train speed increases or the clay depth changes. The developed model uses twenty node brick elements to represent the track components such as the sleepers, the ballast and the subgrade. The rail is described by the three-dimensional Euler-Bernoulli beam element. A quarter train model, including primary and secondary suspensions, is coupled to the three-dimensional railway track model by virtue of the nonlinear Hertzian contact theory. The proposed three-dimensiaonal finite element model incorporates multi-layered ground and radiation damping, by using viscous boundary conditions. Material non-linearity, especially of the ballast layer could be taken into account. Preliminary numerical experiments show that high levels of vibrations can be produced for supercritical train speeds leading to a train passing frequency exceeding the ground cutoff frequency.

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