Modeling of rail track substructure linear elastic coupling

Most analyses of rail dynamics neglect contribution of the soil, or treat it in a very simple manner such as using spring elements. This can cause accuracy issues in examining dynamics for passenger comfort, derailment, substructure analysis, or other reasons. The authors examine how the treatment of the soil in a continuum fashion influences rail simulations. The authors use the finite element method to build a continuum model of the track structure and soil, including rails, fasteners, crossties (sleepers), ballast, subballast, and subgrade. The authors export the modal stiffness of the track structure to a multibody code to simulate the wheel/rail contact of a train over the track. From the modal displacements, the nodal displacements can be reconstructed in the finite element model. Contact forces and other quantities of interest can be determined.

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