Fully 3D analysis of HST-track-soil-structure dynamic interaction

Abstract

In this paper, a general and fully three dimensional multi-body-finite element-boundary element model formulated on time domain to predict vibrations due to train passage at the vehicle, the track and the free field is presented. The vehicle is modelled as a multi-body system and, therefore, the quasi-static and the dynamic excitation mechanisms due to train passage can be considered. The track is modelled using finite elements. The soil is considered as a homogeneous half-space by the boundary element method. This methodology could be used to 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. The non-linear behaviour of the structures could be also considered. In the present paper vibrations induced by high-speed train passage are evaluated for a ballasted track. The quasi-static and dynamic load components are studied and the influence of the suspended mass on the vertical loads is analyzed. The numerical model is validated by comparison with experimental records from two HST lines.