COUNTERMEASURES FOR PASSIVE CONTROL ON SEISMIC POUNDING OF RC GIRDER BRIDGES WITH HIGH PIERS

摘要

The seismic pounding damages of bridges occurred under several earthquakes, so research onpounding effects and countermeasures for mitigation of bridges is needed considering the fact that many RC girder bridges with high piers are being built in China. This paper proposes a nonlinear pounding model simulating the pounding effects among girders. The finite element model of a bridge is formed, and the seismic pounding effects on bridge are analyzed under different ground motions, then the countermeasures of seismic pounding control for bridge are offered. Results indicate that the nonlinear pounding model presented in the paper can accurately simulate the seismic pounding that has complex effects on the seismic response of bridge. It's also found that the characteristics of ground motions influence the pounding effects of structure markedly, and that adjusting the width of expansion joint properly can effectively control or mitigate the pounding effects as well as using the spring-damper restrainers.