中文摘要：

针对减隔震桥梁，选取不同的地震动激励，采用非线性时程分析方法，分析了长周期地震动脉冲特性对减隔震桥梁地震响应和减震效果的影响，并与非减隔震桥梁进行对比。结果表明，长周期地震动的脉冲特性对支座减隔震性能的发挥较为不利，但尚具有一定的减隔震作用；在脉冲型地震动作用下，桥梁的地震响应明显大于脉冲特性不明显地震动作用时的响应，尤其主梁纵向位移放大了3～6倍，应加强防落梁措施。在长周期地震动影响较大的区域修建减隔震桥梁时应关注地震动的脉冲特性对其产生的不利影响。

英文摘要：

Different seismic excitations are selected through nonlinear time-history method to analyze the effect of pulse characteristics on the seismic response of the isolated bridge under the near-faultlong-period ground motion. The effects are compared between the dynamic responses of isolated bridge and non-isolated bridge. The result indicates that the pulse characteristics have an adverse effect on the lead rubber bearing （LRB） performance. The LRB has a certain effect of vibration isolation, but relative to conventional seismic action is reduced. Under the pulse-type ground motions, the seismic response of the bridge is significantly greater than the pulse characteristics not obvious, especially girder longitudinal displacement enlarged 3-6 times, the anti-drop-girder device should be strengthened. It should pay special attention to the adverse effect caused by pulse characteristics when constructing bridge in the near-fault region.