基于隔震设计的不规则结构扭转效应控制研究  

Research on torsional effect control of irregular structure based on seismic isolation design

作　　者：孙任武 杨晓东[1,2] 刘怀超 SUN Renwu;YANG Xiaodong;LIU Huaichao(College of Architecture and Engineering,Kunming University of Science and Technology,Kunming 650500,China;Yunnan Province Engineering Seismic Research Institute,Kunming 650500,China)

机构地区：[1]昆明理工大学建筑工程学院,云南昆明650500 [2]云南省工程抗震研究所,云南昆明650500

出　　处：《四川建筑科学研究》2022年第4期10-16,共7页Sichuan Building Science

摘　　要：通过调整隔震支座的类型和布置位置,改变隔震层偏心率,得到了4种隔震方案,用ETABS软件对4种隔震方案进行了分析,分别以扭转周期比、扭转位移比和扭转角作为平面不规则基础隔震结构扭转效应指标,对比了未隔震结构和隔震结构的扭转效应指标的变化规律。结果表明:对于不规则隔震结构而言,当上部结构的偏心率小于3%时,4种隔震方案下结构的扭转效应明显降低;布置隔震支座时,在满足偏心率小于3%的前提下,应将刚度较大的大直径铅芯橡胶隔震支座布置在隔震层的边角处,使抗侧力构件的布置更有效合理;单轴较大偏心会将轻微偏心向的扭转效应放大,应避免两个主轴方向的隔震层偏心率差值过大。Four seismic isolation schemes were obtained by adjusting the type and location of seismic isolation bearings and changing the eccentricity of the seismic isolation layer, and the four seismic isolation schemes were analyzed by ETABS software.The change patterns of the torsional response indexes of the un-isolated and isolated structures were compared.The results show that for the irregular isolation structure, when the eccentricity of the superstructure is less than 3%,the torsional response of the structure under the four seismic isolation schemes is significantly reduced.In the arrangement of the isolation bearings, under the premise that the eccentricity is less than 3%,the large-diameter lead-core rubber isolation bearings with higher stiffness should be arranged at the corners of the isolation layer to make the arrangement of the lateral force-resisting members more effective and reasonable.The larger eccentricity of single axis will amplify the torsional effect of slight eccentricity, and the difference of eccentricity between two main axes of the isolation layer should be avoided.

关 键 词：不规则隔震结构 偏心率 扭转刚度 扭转效应控制 

分 类 号：TU375[建筑科学—结构工程]