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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。
Aiming at the seismic isolation bridge, different seismic excitation is selected and the nonlinear time-history analysis method is used to analyze the influence of long-period ground motion pulse characteristics on the seismic response and damping effect of the seismic isolation bridge. comparing. The results show that the pulse characteristics of long-period earthquakes are more unfavorable to the bearing desensitization performance, but they still have a certain reduction in seismic isolation. Under the action of impulsive earthquakes, the seismic response of the bridge is obviously greater than that of the impulse characteristics Earthquake action response, in particular, the longitudinal displacement of the main girder magnified 3 to 6 times, should be strengthened anti-shedding measures. In the construction of the seismically isolated bridge in the area where the long-term earthquakes affect a lot, attention should be paid to the detrimental effect of the pulse characteristics of the earthquakes.