Keywords: high speed train, soil structure interaction, railway bridge, resonant vibration.

In this paper dynamic vehicle-track-bridge-soil interaction is studied for high speed lines. The analysis is carried out using a general and fully three-dimensional multi-body-finite element-boundary element model, formulated in the time domain to predict vibrations arising as a result of the train passage over a bridge. The vehicle is modelled as a multi-body system, the track and the bridge is modelled using finite elements and the soil is considered as a homogeneous half-space using the boundary element method. Usually, moving force model and moving mass model are employed to study the dynamic response of bridges. In this paper, the multi-body system allows one to consider the quasi-static and dynamic excitation mechanisms. Soil-structure interaction is taken into account for the dynamic behaviour of simply-supported short span bridges. The influence of soil-structure interaction is analysed in both resonant and non-resonant regimes.

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