Safety Research On Running Responseof Vehicle-Track-Viaduct Simple Beam Subjected To Earthquake Loading

In recent years, urban rail transportation have been booming in many cities. Viaduct railway with its investment economy, convenient construction period, operation of low cost, good adaptability etc, are getting more and more extensive application in urban rail transit construction. Earthquake often accur in our country, and the engineering structures was destroyed by earthquake. When the earthquake occurred the accident of train derailment happened which was caused by earthquake excitation passed by the bridge structure, so the study about vehicle-track-bridge's safety is particularly important and practically significant.Based on the analysis of the earthquake effect on vehicle-track-bridge's dynamic coupling vibration, this thesis uses the universal finite element ABAQUS software to build coupling dynamic 3D model about vehicles-track-bridge, which simulates 31 degrees of vehicle model, the wheel-rail contact model, rail irregularities model, bridge model and pier-soil interaction model. Choose four seismic waves to respectively represente the four kind of site, as external incentives to input, in order to simulate the dynamic reponse of vehicle-track-bridge model accurately when the earthquake happened.Summarizing the safety and stability of vehicle and the dynamic performance of the bridge, the thesis defined the evalustion for train's derailment theoretically when earthquake happened. So select the indexes of vehicle,track and bridge to evaluate the vehicle-track-bridge's dynamic response under action of earthquake.After standardized procession of seismetic waves, the seismetic waves are combinated by vertical+lateral and vertical+lateral+longitudinal. Get the comparative analysis of the dynamic response index of vehicle-track-bridge, and give the evaluation of vehicle's running satety and safety operation of track and bridge.Through the established 3D simulation model, the thesis analysis the ragularity of vehicle-track-bridge's dynamic coupling under action of earthquake from vehicle speed, pier height, track irragularity, the intensity of earthquake wave, rail fastener and bridge seat parameters these five influence factors to put forward to suggestions on the train's operation safety under action of earthquake.