Vehicle-Bridge Vertical System Coupled Vibration Analysis under the Uneven Settlement of Bridge Pier and Abutment

The vertical coupled vibration analysis program of vehicle-track-bridge was compiled to analyze the dynamic response of vehicle and bridge when the train running through the bridge and study the influence of the uneven settlement of the bridge pier and abutment on vehicle-bridge vertical coupled vibration system. The research shows that, under the condition that the track irregularity caused alone by the uneven settlement of bridge pier and abutment when freight train passing through the bridge, the dynamic response of vehicle and bridge increases with the increase of the train speed, the wheel-rail force increases when the train running through the bending angle of the bridge. Among the dynamic indexes of the vehicle and bridge, the car body acceleration is the one most affected and the reduction rate of wheel load is the second under the combined action of ordinary track irregularity and irregularity caused by the uneven settlement of pier and abutment, and all values meet the requirements of the norm when the train running through the bridge. For the bridge of passenger-freight mixed transportation on the same line, the limit values of the norm can satisfy the requirement of the operation safety for freight train and have certain reservation.