板式支座与铅芯支座连续梁桥振动台试验对比分析

通过对分别采用板式支座和铅芯支座的2座3跨连续梁桥模型进行振动台试验,对比分析了这2类桥梁的动力特性、破坏过程及2种支座对连续梁桥地震反应的影响。研究结果表明：地震波特性对桥梁结构的地震反应有较大影响,在对桥梁结构进行抗震设计时,需选择合理的地震动输入;在地震强度较小时,板式支座的滑动能够起到一定的隔震效果,铅芯支座的隔震性能能得到较好的发挥;在地震强度较大时,铅芯支座的隔震性能不能得到很好的发挥,采用铅芯支座的桥梁地震反应不一定小于普通桥梁;通过合理的设计,2类桥梁都完全可以实现大震不倒的设防目标。

Comparative Analysis on Shaking Table Test of Continuous Girder Bridge with Laminated Rubber Bearing and Lead Rubber Bearing

Through comparative analysis on shaking table test of three-span continuous girder bridge models with Laminated Rubber Bearing（LB）and Lead Rubber Bearing（LRB）,the dynamic characteristics,failure process and the seismic response influence of the two types of bridges comparatively.The results show that：Seismic wave characteristics have great influence on the seismic response of bridge,so rational choosing of ground motion input is very important in the seismic isolation design of bridge;When the earthquake intensity is low,the sliding of LB has some effect on seismic isolation,while the LRB has perfect seismic performance;LRB can＇t achieve full potential isolation performance during high intensity earthquake,and the seismic response of LRB bridge almost the same as LB bridge;These two kinds of bridges can both achieve the fortification goal of surviving strong earthquake through reasonable design.