摘要
隔震结构通过设置隔震装置,以达到延长自振周期,降低地震响应的目的。然而,实际施工不当造成隔震装置周围砌筑填充墙,导致上部结构自由运动受限,进而影响了结构的实际隔震性能。为了量化上述不利因素对结构隔震性能的影响,文中以某一混凝土框架结构为研究对象,采用原位测试与数值模拟相结合的方法,在OpenSees软件中对比分析了是否考虑填充墙约束效应的隔震结构在不同类别地震动作用下的地震响应。研究结果表明:相较于无约束的隔震结构,隔震层有外围填充墙约束的结构,其上部楼层最大加速度、层间最大位移角和最大基底剪力在多遇地震作用下分别增大20.4%、38.7%、35.7%,隔震层位移减小79.4%;在设防地震作用下分别增大21.6%、88.4%、59.8%,隔震层位移减小37.8%;在罕遇地震作用下分别增大17.7%、19.4%、14.9%,隔震层位移减小10.3%。随着输入地震动峰值加速度的增大,当填充墙破坏后,铅芯橡胶支座才会发挥较大的作用。在罕遇地震作用下隔震层突破周围填充墙约束,能基本实现隔震效果。
The isolation structure is equipped with isolation devices to extend the natural vibration period and reduce the seismic response.However,improper construction causes the infill wall to be built around the isolation device,which restricted the free movement of the superstructure,thus affecting the actual isolation performance of the structure.In order to quantify the impact of the above unfavorable factors on the seismic isolation performance of the structure,this paper takes a certain reinforced concrete(RC)frame as the research object,uses a method of combining in-situ testing and numerical simulation,and compares and analyzes in the OpenSees considering whether the constraint effect of the infill wall is taken into account.Seismic response of isolation structures under different types of earthquake motions.The research results show that compared with unconstrained seismic isolation structure,the maximum acceleration of the upper floors,the maximum inter-story drift and the maximum base shear force of structures with seismic isolation layers constrained by peripheral infill walls increase by 20.4%,38.7%,35.7%under frequent earthquakes.The displacement of the isolation layer is reduced by 79.4%.Under the action of seismic precautionary earthquakes,they increase by 21.6%,59.8%,86.5%,respectively,and the displacement of the isolation layer is reduced by 37.8%.Under the action of rare earthquakes they increased by 17.7%,19.4%,and 14.9%respectively,and the displacement of the isolation layer decreased by 10.3%.As the peak acceleration of the input ground motion increases,the lead rubber bearing will play a greater role only after the infill wall is damaged.Under rarely occurred earthquake,the seismic isolation layer breaks through the constraints of the surrounding filling walls and can basically achieve the seismic isolation effect.
作者
梁佳康
白玉钢
姜涛
戴君武
庞辉
LIANG Jiakang;BAI Yugang;JIANG Tao;DAI Junwu;Pang Hui(Key Laboratory of Earthquake Engineering and Engineering Vibration,Institute of Engineering Mechanics,China Earthquake Administration,Harbin 150080,China;Key Laboratory of Earthquake Disaster Mitigation,Ministry of Emergency Management,Harbin 150080,China;Chifeng Disaster Prevention and Relief Center,Chifeng 024000,China)
出处
《地震工程与工程振动》
北大核心
2025年第2期213-226,共14页
Earthquake Engineering and Engineering Dynamics
基金
国家自然科学基金青年项目(52208509)
国家自然科学基金项目(52078471)
内蒙古自治区地震局局长基金项目(2023MS10)
黑龙江省自然科学基金项目(H2022E121)
中国地震局工程力学研究所基本科研业务费专项(2022C04)。
