摘要
长周期地震动作用下土-结构相互作用(SSI效应)对基础隔震结构的动力特性产生影响,长周期地震动使基础隔震建筑这类长周期结构地震响应强烈,考虑SSI效应后地震响应可能更大.为此,开展基础隔震结构振动台试验和数值模拟研究,探究考虑长周期地震动作用和SSI效应对基础隔震结构动力响应的影响,验证隔震层附加粘滞阻尼器形成复合隔震结构的减震及限位保护效果.结果表明:SSI效应会增大隔震层以上楼层的层间位移响应;近场脉冲大震下考虑SSI效应的隔震层位移及上部结构层间位移角将超限;采用复合隔震方案避免了位移超限引起的结构破坏,同时能提高减震效果.建议实际工程中采用基础隔震技术时应考虑SSI效应的影响,对近场脉冲地震动做独立工况分析,并进行复合隔震设计.
Soil-structure interaction effect(SSI effect) under the long-period ground motion affects the dynamic characteristics of the base isolation structure.Long-period ground motion makes such structures as base isolation structure have strong seismic response, which may be greater when SSI effect is considered.Therefore, the shaking table test of isolation structure and numerical simulation research were carried out, and the impact of long-period ground motion and SSI effect on the dynamic response of the base isolation structure were explored. Damping and limit protection effects of composite isolation structure with additional viscous dampers on the isolation layer are verified.The results show that the SSI effect will increase the inter story displacement response of floors above the isolation layer;isolation layer displacement considering SSI effect and upper structure interlayer drift ratio will exceed limit under near-field impulse large earthquake;composite seismic isolation scheme can avoid structural damage caused by displacement overrun and improve damping effect.It is suggested that the impact of SSI effect should be considered when using base isolation technology in practical engineering, with independent working condition analysis of near-field pulse ground motion and compound seismic isolation design.
作者
施建日
董昕珺
林友勤
许立英
吴应雄
SHI Jianri;DONG Xinjun;LIN Youqin;XU Liying;WU Yingxiong(Fujian Provincial Institute of Architectural Design and Research Co.,Ltd.,Fuzhou 350000,China;College of Civil Engineering,Fuzhou University,Fuzhou 350108,China;School of Civil Engineering and Architecture,Southwest University of Science and Technology,Mianyang 621010,China)
出处
《应用基础与工程科学学报》
EI
CSCD
北大核心
2022年第4期936-950,共15页
Journal of Basic Science and Engineering
基金
国家自然科学基金项目(51778149)
中国地震局工程力学研究所重点实验室开放研究专项(2021D03)。
关键词
长周期地震动
SSI效应
基础隔震
复合隔震
振动台试验
近场脉冲地震动
long-period ground motion
SSI effect
base isolation
composite isolation
shaking table test
near-field pulse ground motion
