平面不规则基础隔震结构抗扭设计研究  

Torsional Resistant Design of Plane Irregular Base-isolated Structures

作　　者：黄小宁 王威[1] 王宁[1,2] 杜永峰 HUANG Xiaoning;WANG Wei;WANG Ning;DU Yongfeng(Department of Civil Engineering, Qinghai University, Xining 810016, Qinghai, China;Qinghai Provincial Key Laboratory of Energy-saving Building Materials and Engineering Safety, Xining 810016, Qinghai, China;Institute of Earthquake Protection and Disaster Mitigation, Lanzhou University of Technology, Lanzhou 730050, Gansu, China)

机构地区：[1]青海大学土木工程学院,青海西宁810016 [2]青海省建筑节能材料与工程安全重点实验室,青海西宁810016 [3]兰州理工大学防震减灾研究所,甘肃兰州730050

出　　处：《地震工程学报》2020年第5期1283-1288,共6页China Earthquake Engineering Journal

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

摘　　要：针对平面不规则结构在水平地震作用下的振动特性,通过调整隔震层隔震支座的布置,得到3种不同工况的隔震层刚心与上部结构质心、刚心相对位置关系,分别以楼层位移和层间位移为指标的扭转位移比,作为平面不规则基础隔震结构扭转响应指标,利用弹塑性时程分析方法,通过对3种不同工况的扭转指标对比分析研究,提出适用于平面不规则基础隔震结构的抗扭设计方法。结果表明:对于平面不规则结构,应在保证隔震层扭转位移比小于1.2的基础上,使隔震层的刚心和上部结构的刚心分别位于上部结构质心的两侧,可有效控制上部结构的扭转。Considering the vibration characteristics of plane irregular structures under horizontal earthquakes,the relative position between the isolation layer stiffness center and the upper structure mass center and stiffness center is obtained by adjusting the isolation bearing position.Three different working conditions are considered.The torsional displacement ratio is used as the torsional response index of the plane irregular base-isolated structures;then the elastoplastic time-history analysis method is used to compare and analyze the torsional response index under the three considered working conditions.A torsional resistant design method is proposed for plane irregular base-isolated structures.The results show that for plane irregular structures,the torsional displacement ratio of the isolated layer should be less than 1.2;at this ratio,the stiffness center of the isolation layer and the stiffness center of the upper structure will be positioned on both sides of the mass center of the upper structure;consequently,the torsion of the upper structure can be controlled.

关 键 词：不规则基础隔震结构 扭转位移比 偏心距 抗扭设计 

分 类 号：TU352.12[建筑科学—结构工程]