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PROCEEDINGS OF THE FIFTEENTH INTERNATIONAL CONFERENCE ON CIVIL, STRUCTURAL AND ENVIRONMENTAL ENGINEERING COMPUTING
Edited by: J. Kruis, Y. Tsompanakis and B.H.V. Topping
A Train-Track Dynamic Interaction Model
J.A. Romero, M.A. Alvarado Morales, G.M. Arroyo Contreras and E. Betanzo-Quezada
Faculty of Engineering, Queretaro Autonomous University, Mexico
J.A. Romero, M.A. Alvarado Morales, G.M. Arroyo Contreras, E. Betanzo-Quezada, "A Train-Track Dynamic Interaction Model", in J. Kruis, Y. Tsompanakis, B.H.V. Topping, (Editors), "Proceedings of the Fifteenth International Conference on Civil, Structural and Environmental Engineering Computing", Civil-Comp Press, Stirlingshire, UK, Paper 124, 2015. doi:10.4203/ccp.108.124
Keywords: railways, bending stress, soft supports, railway-track interaction, finite element.
Railway safety depends on a variety of factors that include the properties and operational conditions of both the railway vehicles and the infrastructure. In this context, the rail fracture has been identified as a critical situation leading to derailments. This loss of integrity of the rail material is the result of the cyclic loading causing material fatigue, where the stresses derive from a combination of loadings that include normal and shearing forces as well as bending moments. In this respect, bending would be the most influential loading for rail fatigue, and it depends on a multitude of factors that are deeply influenced by the maintenance practices considered for such infrastructures. This paper proposes a coupled train - track dynamic interaction model, which is used to study the effect of an individual soft support on the level of bending stress developed on the adjacent beam node. The model considers a finite element approach to model the infrastructure while the vehicle is modelled under the principles of multibody dynamics. Results indicate that having a soft support can notably increase the stress level in the adjacent beam node, from between eight and thirty percent as a function of the level of stiffness reduction and vehicle speed.
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