Dynamics of a Precast System for High-Speed Railway Tracks

Abstract eng:
As far as slab tracks are concerned, UIC [1] considers seven different families of structures, regarding the type of slab supporting (punctual or continuous), the construction method (in situ or precast), the number of resilient levels and also the type of the foundation material (plain concrete or bituminous material). This paper begins with a brief description of precast slab systems currently available for high-speed railway lines. A research work on the dynamic behavior of precast slab tracks is being undertaken in order to identify the dynamic effects of high-speed traffic in this type of systems. In this paper some of the results attained so far in the numerical calculations are presented and discussed. Calculations are performed in 2D with the finite element program Ansys, considering several vehicle speeds and also different types of vehicle models. The dynamic response of the track is evaluated in terms of track displacement, force at the fastening systems, bending moment on the slab and also on the support concrete layer. Also the influence of the track foundation and the track geometrical quality on its response is studied.

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