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中文摘要：
为从有利于各墩协同抗震的角度探讨适用于长联大跨连续梁桥的减、隔震技术,以内蒙刘召黄河大桥主桥其中一联（55＋10×100＋55）m的预应力混凝土连续梁桥为背景,开展摩擦摆支座隔震、粘滞阻尼器减震及盆式橡胶支座抗震研究。建立全桥有限元计算模型,采用双线性滞回模型模拟摩擦摆支座、Maxwell模型模拟粘滞阻尼器,输入50年超越概率2%的3条地震波进行非线性时程反应分析。结果表明,长周期长联大跨连续梁桥的隔震机理为通过减弱制动墩对主梁的约束来减小作用于制动墩顶的有效主梁质量、改制动墩单独抗震为各墩协同抗震;摩擦摆支座隔震可有效地提高其抗震性能。
英文摘要：
To study the seismic mitigation and isolation techniques suitable for long span and long unit continuous beam bridge from the angle of facilitating the collaborated seismic resistance of all piers of the bridge, one of the continuous unit of the （55＋10×100＋55） m prestressed concrete continuous beam bridge of the main bridge of Liuzhao Huanghe River Bridge in Inner Mongolia was cited as an example and the seismic isolation of friction pendulum bearings, seismic mitigation of viscous dampers and seismic resistance of rubber pot bearings were investigated. The finite element calculation model for the whole bridge of the example bridge was established, the bilinear hysteretic model was used to simulate the friction pendulum bearings, the Maxwell model was used to simulate the viscous dampers and by way of inputting 3 seismic waves of 2% of the 50-year exceedance probability, the nonlinear time-history response analysis was carried out. The results of the analysis demonstrate that the seismic isolation mechanism of the long period, long span and long unit continuous beam bridge is to reduce the effective main beam mass acting on the braking pier tops through weakening the restraint of the braking piers to the main beam and is to change the independent seismic resistance of the braking piers into the collaborated seismic resistance of all piers. The application of the seismic isolation of the friction pendulum bearings can effectively improve the seismic performance of the bridge.
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