基于隔震技术的偏心结构扭转控制研究  

Research on torsion control of eccentric structure based on isolation technology

作　　者：王威[1] 黄小宁 王宁[1] 杨亚平[1] 常雪 Wang Wei;Huang Xiao-ning;Wang Ning;Yang Ya-ping;Chang Xue(Department of Civil Engineering,Qinghai University,Xining 810016,China)

机构地区：[1]青海大学土木工程学院,青海西宁810016

出　　处：《工程抗震与加固改造》2020年第1期83-89,56,共8页Earthquake Resistant Engineering and Retrofitting

基　　金：青海省自然科学基金-青年项目(2018-ZJ-953Q);青海省创新平台建设专项项目(2018-ZJ-T01)。

摘　　要：针对偏心基础隔震结构的地震响应特性,分析该类结构的扭转响应。建立偏心隔震结构分析模型,利用弹塑性时程分析方法,以扭转位移比为响应指标,分析结构在多遇、设防及罕遇地震作用下的扭转响应。研究结果表明:本文中基础隔震结构X向以楼层位移为指标的扭转位移比略微增大,以层间位移为指标的扭转位移比放大现象明显,增大幅值最大为18.2%,且超过1.2;Y向的扭转位移比均减小且小于1.2。结合本文分析的基础隔震结构,当上部结构为偏心结构时,使隔震层刚心和上部结构质心重合时,可减小Y向的扭转位移比,但X向的以层间位移为指标的扭转位移比放大现象明显。According to the seismic response characteristics of eccentric base-isolated structures,the torsional response of such structures is analyzed.An eccentric isolation structure analysis model is established,and the torsional displacement ratio is used as the response index to analyze the torsional response of the structure under multiple earthquake,moderate earthquake and rare earthquake by the seismic elastic-plastic time history analysis method.The results show that:the torsional displacement ratio of the base-isolated structure in the X direction with floor displacement as the index increases slightly,and the torsional displacement ratio with the floor-tofloor displacement as the index enlarge significantly,with a maximum increase of 18.2%and exceeding 1.2;the torsional displacement ratios in the Y direction all decrease and are less than 1.2.In combination with the basic isolation structure analyzed in this paper,when the superstructure is an eccentric structure,the torsional displacement ratio in the Y direction can be reduced when the rigid center of the isolation layer and the center of mass of the upper structure coincide,but the torsional displacement with the interlayer displacement in the X direction as the index is more obvious than the amplification phenomenon.

关 键 词：偏心结构 位移比 时程分析 扭转控制 

分 类 号：TU352.1[建筑科学—结构工程]