| As rapid development of high speed railways in china, the long span cable-stayed bridges are always used in the construction of high speed railways. With taking the Anqing Yangtze River Bridge as example, the dynamic response characteristics of the vehicle-bridge interacted system under seismic loads are studied.In this dissertation, the characteristics of cable-stayed bridge, the ways of studying the interacted system of Vehicle-bridge and the importance of studying the dynamic response of the vehicle-bridge interacted system under seismic loads are illustrated. The vehicle-bridge dynamic analysis model is established, in which the bridge subsystem is modeled by the finite element method; the vehicle subsystem is established by rigid-body dynamic method; the vertical and lateral wheel-rail interacted forces are defined by the Corresponding Assumption and simplified Kalker Creep Theory; the track irregularities and typical seismic acceleration time histories are taken as system exciter, and the dynamic response results of the vehicle-bridge system is received by the "System Separated Iteration Method".In this dissertation, the cable-stayed bridge finite space model is established by the MIDAS software, and the natural vibration characteristics of the bridge are analyzed. The process of vehicles running on bridge is simulated by exerting seismic acceleration time histories and wheel-track forces time histories calculated by program of vehicle-bridge on the bridge model, and the dynamic response of earth-vehicle-bridge results are received by method of the"System Separated Iteration Method". Base on the analysis above, influences of vehicle-bridge caused by vehicle speed, running in one or two direction, various seismic loads and the seismic traveling wave effect are analyzed. In the end, the bridge dynamic response, the running safety and stability of the vehicles are evaluated, which may be used for future further design. |
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