Dynamic Analysis of Long-span Suspension Bridge and Vehicle System under Un-uniform Seismic Excitation

Abstract

With the development of high-speed railway construction, there are more and more long-span railway bridges, which significantly increases the probability of trains running on the bridge during an earthquake. The impact of seismic loads on the safety of trains running on the bridge cannot be ignored. By studying the dynamic response of the vehicle-bridge system under seismic action, we can try to avoid derailment and other events caused by earthquakes as much as possible. This paper mainly focuses on three aspects: seismic wave input, structural characteristics, and vehicle-bridge system response analysis, to study the dynamic response of the vehicle-bridge system under the action of seismic waves considering the traveling wave effect. Through the dynamic analysis of the vehicle-bridge system under non-uniform seismic action for the Oujiang suspension bridge. The research found that: (1) The impact on the vehicle-bridge system is not significant among different seismic wave propagation velocities; (2) With the increase of train speed, the derailment coefficient and the wheel load reduction rate of the train increase.