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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。
Shaking table tests were carried out on two 3-span continuous girder bridge models with plate bearing and lead bearing respectively. The dynamic characteristics and failure process of these two types of bridges were compared and analyzed. The seismic response of two bearings to continuous girder bridge Impact. The results show that the seismic wave characteristics have a great influence on the seismic response of the bridge structure. In the seismic design of the bridge structure, the reasonable ground motion input should be selected. When the seismic intensity is small, the sliding of the plate bearing can play a certain role The seismic isolation effect of the lead support and the isolation performance of the lead support can be well exerted; when the seismic intensity is large, the isolation performance of the lead support can not be well exerted, and the seismic response of the bridge using the lead support Not necessarily smaller than ordinary bridges; through reasonable design, both types of bridges are fully capable of achieving the goal of preventing the occurrence of major earthquakes.