基于长周期地震动考虑软夹层地基的复合层间隔震结构试验研究  

Experimental study on composite interlayer isolation structure considering soft interlayer foundation based on long-period ground motion

作　　者：方泓杰 董昕珺 许立英[2] 施建日 吴应雄[1] Fang Hong-jie;Dong Xin-jun;Xu Li-ying;Shi Jian-ri;Wu Ying-xiong(College of Civil Engineering,Fuzhou University,Fuzhou 350108,China;School of Civil Engineering and Architecture,Southwest University of Science and Technology,Mianyang 621010,China;Fujian Provincial Institute of Architectural Design and Research Co.Ltd,Fuzhou 350000,China)

机构地区：[1]福州大学土木工程学院,福建福州350108 [2]西南科技大学土木工程与建筑学院,四川绵阳621010 [3]福建省建筑设计研究院有限公司,福建福州350000

出　　处：《工程抗震与加固改造》2023年第6期33-42,50,共11页Earthquake Resistant Engineering and Retrofitting

基　　金：国家自然科学基金资助(51778149);中国地震局工程力学研究所基本科研业务专项(2021D03);福建省建设科技研究开发项目(2020,2022)。

摘　　要：长周期地震动易使隔震结构地震响应强烈,对于软弱地基上隔震结构考虑土-结构相互作用(SSI效应)后可能更为不利。因此,对刚性、软弱夹层地基上一大底盘单塔楼缩尺模型进行数值模拟和振动台试验,探究软夹层地基上SSI效应对层间隔震结构的动力响应和减震性能的影响。针对可能出现的隔震层位移超限情况,提出在隔震层增设粘滞阻尼器形成复合隔震体系,并分析其减震和限位作用。结果表明:考虑SSI效应后结构的自振周期较刚性地基增大,但采用隔震技术延长的周期倍数降低;SSI效应可能增大或减小隔震层上部塔楼的加速度响应,对下部底盘起放大作用;考虑SSI效应后长周期地震动下隔震结构的地震响应较普通地震动更为强烈,减震效果变差,特别是近场脉冲地震动下隔震层位移超限,体系失效破坏;复合隔震结构可以有效控制隔震层位移,降低底盘的加速度和剪力响应,提高体系安全性。Long-period ground motion easily makes the earthquake response strongly,which may be more unfavorable for the earthstructure interaction(SSI effect).Therefore,numerical simulation and vibration table test are conducted on the scale model of a single chassis on the rigid and weak interlayer foundation,the influence of SSI effect on the dynamic response and shock absorption performance of the soft interlayer foundation is explored.According to the possible shock isolation layer displacement overrun,adding viscous damping system in the shock isolation layer is put forward,and the shock damping and limiting effect are analyzed.The results show that:after considering the SSI effect,the self-vibration period of the structure increases compared with the rigid foundation,but the SSI effect may increase or reduce the acceleration response of the upper tower and the lower floor;after the SSI effect,the shock absorption effect is worse,especially the displacement and the system failure;the composite isolation structure can effectively control the displacement,reduce the acceleration and shear response of the chassis,and improve the system safety.

关 键 词：长周期地震动 SSI效应 软夹层地基 层间隔震 复合隔震 振动台试验 

分 类 号：TU435[建筑科学—岩土工程] TU352.12[建筑科学—土工工程]