板式橡胶支座地震易损性分析.doc

板式橡胶支座地震易损性分析.doc板式橡胶支座地震易损性分析
摘要:以一中等跨径连续梁桥为研究对象,(PEER)强震数据库中选取100条地震波,进行了一系列非线性时程分析,,提出了板式橡胶支座4种不同损伤状态损伤指标的确定方法,,,支座在地震作用下的易损性较其他构件更严重,且桥台支座比桥墩支座更容易遭受损坏;增加支座橡胶层厚度或改用聚四氟乙烯滑板支座能很好地改善桥台支座的抗震性能.
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关键词:桥梁;板式橡胶支座;地震;易损性;地震破坏�
中图分类号: 文献标识码:A
Research on the Seismic Vulnerability Analysis�
of Laminated Rubber Bearing
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LI Li-feng,WU Wen-peng,HUANG Jia-mei,WANG Lian-hua
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(College of Civil Engineering, Hunan Univ, Changsha, Hunan 410082, China)
Abstract: Taking a mid-span continuous bridge as the research subject, the restoring force model of rubber bearing and the dynamical model of nonlinear analysis were established. Also, 100 earthquake wave records were chosen from PEER to conduct a series of nonlinear time-history analyses, and the relative displacement responses of rubber bearings were obtained. Based on the principle of Performance-Based Seismic Design and the theory of seismic vulnerability analysis, a method for determining four different damage indexes of laminated rubber bearing was proposed. According to traditional reliability probability analysis method, a curve between the spectral acceleration and the relative displacement ductility ratios of bearings was fitted, and the fragility curves of different bearings were formed. The results have demonstrated that bearing, especially the bearing on abutment, is more vulnerable than other bridge members under earthquake. Therefore, the seismic performance of bearing will be greatly improved if the thickness of rubber bearings is heightened or the PTFE sliding rubber bearings are ad
opted for abutment bearing.�
Key words:bridge; laminated rubber bearing; earthquake; vulnerability;seismic damage
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板式橡胶支座是连接桥梁上部结构和下部结构的重要构件,主要起到传递上部结构反力和承受水平变形的作用,以其造价经济、构造简单、受力合理等优点,在桥梁工程中得到广泛的应用,,板式橡胶支座可以起到延长结构周期、增加结构阻尼的作用,从而可以有效地减小桥墩所受的地震荷载、达到满足桥梁隔震的要求,因此在桥梁隔