中文摘要：

为了明确板式橡胶支座梁桥在强震作用下的横向抗震性能,在总结国内外学者有关板式橡胶支座滑动效应、钢筋混凝土挡块力学性能的基础上,建立了板式橡胶支座梁桥全桥精细化有限元数值模型;以支座位移、挡块变形和桥墩位移延性系数为损伤指标分别制定了板式橡胶支座、钢筋混凝土挡块和桥墩的损伤状态判断准则;选择汶川地震及国内外其他地震事件的近断层地震动记录作为输入,考察典型板式橡胶支座简支梁桥在近断层地震动输入下的抗震性能。结果表明：基于精细化模型的数值模拟结果真实再现了汶川震区板式橡胶支座梁桥的典型震害现象;上、下部结构连接部位是板式橡胶支座梁桥横桥向抗震薄弱环节;抗震设计时,应加强和重视该类型桥梁钢筋混凝土挡块的合理力学性能参数研究以及新型横向限位装置设计等方面的研究。

英文摘要：

In order to refine the seismic performance of small and medium girder bridges supported on elastomeric pad bearings in the transverse direction under strong earthquake excitations,based on the summary of the research results on the sliding effect of plate type elastomeric pad bearings and the mechanical property of reinforced concrete stopper obtained by scholars at home and abroad,a refined finite element model for this kind of girder bridge was established.The damage evaluation indexes for plate type elastomeric pad bearings,reinforced concrete stoppers and damage state of piers were proposed in terms of bearing displacement,stopper deformation and displacement ductility factor of piers respectively.Taking near-fault ground motions records in Wenchuan earthquake and other domestic and foreign earthquakes as input,seismic performance of typical simply supported girder bridge with plate type elastomeric pad bearings under the input of near-fault ground motion was investigate.The results show that the numerical simulated results based on refined model truly represent the typical damage phenomenon of girder bridges with elastomeric pad bearings in Wenchuan earthquake;the joint partbetween the superstructures and the substructures in girder bridges on plate type elastomeric pad bearings is the vulnerable link when suffered a catastrophic earthquake;and special attentions should be paid to appropriate mechanical property of reinforced concrete stoppers and new kinds of transverse restrainers when conducting the seismic design of girder bridges on elastomeric pad bearings.