近断层地震作用下钢筋混凝土连续梁桥地震易损性分析

SEISMIC FRAGILITY OF THE RC CONTINUOUS GIRDER BRIDGE UNDER NEAR-FAULT GROUND MOTIONS

考虑桥墩、支座构件及主梁的碰撞损伤指标,对钢筋混凝土连续梁桥进行了地震易损性分析.综合考虑了结构参数的不确定性,从太平洋地震工程研究(Pacific earthquake engineering research,PEER)数据库中随机选取了20条近场地震记录,得到大量的随机地震-结构样本.结合不同破坏状态下的桥梁损伤指标,根据结构的能力与需求得到了桥梁各构件及整体桥梁结构的地震易损性曲线.从概率意义上判断在强烈地震作用下桥梁结构所处的破坏状态,为今后在役的同类型桥梁震害预测提供了参考.

The seismic fragility of a RC（reinforced concrete） continuous girder bridge is analyzed, with consideration of damages of bridge piers, bearing components and the collision of the main beam. In view of the structural parameter randomness of the bridge structure, 20 near-fault ground motions are selected from the PEER（Pacific Earthquake Engineering Research database）, and a large number of random structure samples are established. Using the bridge damage index under different damage states, the fragility curves of the bridge components and the bridge system are obtained based on the structure of the capacity and the demand. According to the actual seismic demand of similar as-built bridges, the damage states can be obtained in the sense of probability, and provide a reference for future seismic damage predictions.