A numerical model to predict vibrations due to hst

Abstract eng:
A general and fully three dimensional boundary element–finite element model based on time domain formulation to predict vibrations in the track, in the soil and on structures situated near the track, due to train passage is presented. The vehicle is modelled as multibody and, therefore, the quasi-static and the dynamic excitation mechanism are considered. As compared to two-and-a-half domain solutions, this formulation can take into account local soil discontinuities, underground constructions such as underpasses, and coupling with nearby structures that brake the uniformity of the geometry along the track line. Track and others structures are modelled using the finite element method and it can be considered their non-linear behaviour because the time domain formulation is employed. The soil is represented using the boundary element method. A new methodology to improve the convergence of the iterative boundary element–finite element coupling procedure is presented. The numerical model is validated by the study of two benchmark problems. Vibrations induced by high–speed train are computed for ballast track and three slab track models: Edilon EDF, classic Rheda and Stedef. The receptance in every track are obtained and vibrations because of train passage at different speeds are also computed and they are compared. The numerical model is experimentally validated by comparison with existing experimental records. Finally, the dynamic behaviour of a building situated close the track is studied considering rigorously the soil-structure interaction effects.

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