A method for defining high speed train loads in time - domain FEM models

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This paper presents a method for defining high speed train loads in finite element models to simulate train-induced ground vibrations in time-domain. The method assumes that wheel/rail contact is perfect and that the wheel loads act on the rails as moving forces. These moving forces are then transferred to the ballast surface as a series of equivalent concentrated forces that appear successively depending on the train speed. To verify the presented method, we compare numerical and analytical solution for a case of a track resting on an elastic half space subjected to an axle force moving at a high speed.