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为了研究在不同地震烈度下不同类型场地的隔震连续梁桥结构的振动特性和隔震效果,根据一座在建的两跨隔震梁桥,按1/10的比例设计了一座两跨隔震梁桥模型及试验用方形铅芯橡胶支座,并对其力学性能进行试验;在此基础上对梁桥结构模型进行了地震模拟振动台试验。结果表明:地震动的幅度和频谱成分、场地类别、地震烈度、断层等因素对隔震桥梁体系的隔震效果有很大影响;输入不同地震波和不同加速度峰值,小震时铅芯橡胶支座水平刚度较大,结构较稳定,大震时铅芯橡胶支座水平刚度较小,支座恢复力-位移滞回曲线面积较大,可以较多地耗散地震输入能量,减小能量向桥梁上部结构的传递。
In order to study the vibration characteristics and the isolation effect of the isolated continuous girder bridges with different types of sites under different seismic intensity, according to a two-span isolated girder bridge under construction, a two-span isolation The beam bridge model and the test square lead rubber bearing, and its mechanical properties were tested. On this basis, the earthquake simulation shaking table test was carried out on the beam bridge structural model. The results show that the amplitude and frequency components of ground motion, the type of site, the intensity of earthquake, the fault and other factors have a great influence on the seismic isolation effect of the isolated bridge system. When different seismic waves and different acceleration peaks are input, The horizontal stiffness is large and the structure is stable. The horizontal rigidities of the lead-rubber bearing in large earthquakes are small and the restoring force of the bearing-displacement hysteresis curve is large, which can dissipate the input energy and reduce the energy to the bridge The transfer of the superstructure.