Dynamic analysis of transition zones on high speed railway lines by explicit analysis methods

Abstract eng:
Along the track there are zones of abrupt changes in track stiffness such as those at transitions from embankment to bridge, between distinct types of railway, from track in an embankment to track in an excavation or in zones with lower unlevelled crossings [1]. Changes in the vertical stiffness of the track induce important variations in the wheel-rail interaction forces, which can put the stability of the wheel-rail contact at risk while contributing to a faster degradation of the track. In this work, a dynamic analysis of the train-tracksoil system is presented for the case of the passage of an ICE2 train through a track stiffness transition induced by stiffness moduli ratios of the foundation soils equal to 5, 10 and 20. For that purpose, a 3D finite element model was developed in the commercial program LS-DYNA in which the differential equations of motion are numerically integrated by explicit analysis methods. The obtained results showed a very significant increase of the dynamic effects at the transition zone with the increase of the speed and of the ratio of the elastic moduli of the foundation soil.

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