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Date of Publication:2013-01-01

Journal:振动与冲击

Issue:21

Page Number:58-64

ISSN No.:1000-3835

Abstract:Using ANSYS software platform, a time-variant wheel-rail coupled element with artificial nodes was introduced, combining application of user programmable features (UPFs), a dynamic FE model for the seismic response analysis of a high-speed vehicle-rail-bridge system was formed and embedded in the popular finite element software ANSYS. With the proposed approach, the dynamic interaction of rail and bridge was modeled with mass-spring-dashpot systems, the vehicle subsystem was modeled as a rigid-body dynamic model. The vehicle-rail-bridge system was assembled through satisfying the geometric compatibility and balance of the interaction forces on the connected nodes. Earthquake acceleration time histories as the input excitations to the system were applied to the rail-bridge subsystem with the large-mass method. Finally, the reliability and good serviceability of the proposed time-varying system were verified through numerical examples and its application to actual engineering projects. It was shown that this time-varying system model has the potential to solve sophisticated and real engineering problems, combined with the rich element library and nonlinear solvers available in the commercial finite element software ANSYS.

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