铅芯橡胶支座PC连续梁桥隔震性能试验研究  

Experimental Study of Seismic Isolation Performance of PC Continuous Beam Bridge Using Lead-Rubber Bearings

作　　者：刘志华[1] 韩之江[1] 王磊[1] 

机构地区：[1]山西省交通科学研究院桥梁工程防灾减灾山西省重点实验室,山西太原030006

出　　处：《桥梁建设》2016年第5期18-23,共6页Bridge Construction

基　　金：国家自然科学基金项目(51178220)~~

摘　　要：为了研究铅芯橡胶支座对混凝土连续梁桥的隔震效果,选取典型的3×30m跨PC连续梁桥,按1∶20比例设计、制作了2座分别采用板式橡胶支座和铅芯橡胶支座的桥梁模型,通过振动台试验,分析其在不同地震波及峰值加速度作用下的自振频率、支座变形及墩顶位移和加速度等的变化规律。结果表明:PC连续梁桥采用铅芯橡胶支座能够有效减小地震对桥梁的损害;不同的地震波对桥梁的地震反应和铅芯橡胶支座隔震性能的发挥有很大影响;桥墩刚度的减小和塑性铰的形成,可以降低桥梁上部结构的地震响应,起到隔震的效果,但却限制了铅芯橡胶支座隔震性能的发挥。To study the effect of the lead‐rubber bearings on the seismic isolation performance of concrete continuous beam bridge ,a typical 3×30-m span prestressed concrete （PC） continuous beam bridge w as selected ,tw o models of the bridge respectively using the laminated rubber bear‐ings and lead‐rubber bearings were designed and fabricated on the scale of 1∶20 and through the shake table tests ,the changing laws of the natural vibration frequencies ,bearing deformation and the pier top displacement and acceleration of the models under the action of the different seismic waves and peak acceleration were analyzed .The results of the analysis show that the utilization of the lead‐rubber bearings on the PC continuous beam bridge can effectively reduce the seismic dam‐age to the bridge .The different seismic waves have great effect on the seismic responses of the bridge and the role of the seismic isolation performance of the lead‐rubber bearings .T he reduction of the rigidity and the formation of the plastic hinges of the piers can decrease the seismic responses of the superstructure of the bridge and can produce the effect of the seismic isolation ,but will re‐strict the role of the seismic isolation performance of the lead‐rubber bearings .

关 键 词：连续梁桥 铅芯橡胶支座 地震反应 隔震性能 振动台试验 自振频率 塑性铰 

分 类 号：U448.215[建筑科学—桥梁与隧道工程] U442.55[交通运输工程—道路与铁道工程]