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为研究基础隔震结构初始局部破坏引起的动力效应和动力效应影响区域,本文采用瞬时卸栽法对基础隔震结构进行了动力连续倒塌分析。使用SeismoStruct软件建立有限元模型,以发生局部失效后的结构与原结构的梁端弯矩比、柱轴力比、梁内轴力及支座位移为指标,分析了动力效应作用区域。研究表明,角部构件失效后上部节点的竖向位移较大,更容易发生连续倒塌;局部构件失效后对剩余结构产生的影响以失效点为中心向四周递减,对相邻短跨方向构件的动力影响大于长跨方向构件;由于隔震支座失效使隔震层抗侧刚度减弱,所以相比底层柱失效,隔震支座失效会使隔震层产生较大的位移。
In order to study the dynamic effects and dynamic effects caused by the initial local damage of base isolation structure, instantaneous unloading method was used to analyze the dynamic collapse of base isolation structure. SeismoStruct software was used to establish the finite element model. The bending moment ratio, axial force ratio, axial force of the beam and displacement of the support were taken as indexes to analyze the dynamic effect area after the failure. The results show that the vertical displacement of the upper joint after the failure of the corner member is larger and the continuous collapse is more likely to occur. The effect of the failure of the local member on the remaining structure decreases around the failure point, The dynamic influence is greater than that of the long span member. Because the failure of isolation bearings weakens the lateral stiffness of the isolation layer, the failure of isolation bearings will cause a large displacement of the isolation layer compared with the failure of the bottom column.