Dynamic behaviour of ballasted railway tracks: a discrete/continuous approach

Laurent Ricci 1 Vu-Hieu Nguyen 2 Karam Sab 1 Denis Duhamel 1 Laurent Schmitt 3
1 LAMI - Laboratoire d'Analyse des Matériaux et Identification
2 MSME - Laboratoire de Modélisation et Simulation Multi Echelle
3 LIVE - Laboratoire Image, Ville, Environnement
Abstract : Owing to the small number of grains in the vertical direction of the ballast layer of a railway track, a discrete/continuum double-layer model is proposed: the upper layer (the ballast) is modelled by a discrete 3D-lattice of interacting grains whereas the infinite underlayer is a continuum linear elastic medium. The problem under consideration is the dynamic behaviour of this double-layer system under the action of a moving load. A parametric study concerning the underlayer stiffness, the load velocity and the grain size is conducted. A comparison with the continuum modelling is provided for realistic moving loads.
Keywords : Moving load Fourier’s transform Dynamic railway track Discrete/continuum model Ballast vibration
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Journal articles
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https://hal-upec-upem.archives-ouvertes.fr/hal-01644698
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Submitted on : Wednesday, November 22, 2017 - 3:05:01 PM
Last modification on : Wednesday, December 11, 2019 - 8:45:16 AM

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Laurent Ricci, Vu-Hieu Nguyen, Karam Sab, Denis Duhamel, Laurent Schmitt. Dynamic behaviour of ballasted railway tracks: a discrete/continuous approach. Computers and Structures, Elsevier, 2005, 83, pp.2282-2292. ⟨10.1016/j.compstruc.2005.03.035⟩. ⟨hal-01644698⟩

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