永久位移型地震动对建筑隔震设计影响初探  

Preliminary study on influence of ground motion with permanent displacement on building seismic isolation design

作　　者：李艳华 宋廷苏 王林建[1,2] 刘观 LI Yanhua;SONG Tingsu;WANG Linjian;LIU Guan(Shenzhen Academy of Disaster Prevention and Reduction,Shenzhen 518001,China;Yunnan Earthquake Agency,Kunming 650224,China)

机构地区：[1]深圳防灾减灾技术研究院,深圳518001 [2]云南省地震局,昆明650224

出　　处：《建筑结构》2023年第11期110-115,102,共7页Building Structure

基　　金：中国地震局地震科技星火计划项目(XH19071),中国地震局地震科技星火计划项目(XH20086);深圳市可持续发展科技专项(KCXFZ202002011010039);广东省省级科技计划项目(2018B020208003)。

摘　　要：以自振周期大于2s的某实际钢结构建筑为研究对象,分别在设防地震和罕遇地震下,输入含与不含永久位移型地震动,分别计算得到隔震结构和非隔震结构的非线性地震反应。通过对比含与不含永久位移型地震动作用下的上部结构地震反应,进而分析永久位移对该类型建筑隔震设计的影响。结果表明:无论地震动输入是否含永久位移,与非隔震结构相比,隔震结构的层间剪力和倾覆力矩均显著降低,且降低幅度随着楼层的升高而增大;在含永久位移型地震动与不含永久位移型地震动分别作用下,各楼层层间剪力比值与倾覆力矩比值无明显差别,比值基本在1左右;在两类地震动作用下,计算得到的减震系数差别不超过10%;在两类地震动作用下,隔震层支座平均最大拉、压应力及位移相差不大,永久位移型地震动作用的放大效应不明显。A practical steel structure building with natural vibration period greater than 2s was taken as the research object.Under the fortification earthquake and rare earthquake,the nonlinear seismic response of isolated structure and non-isolated structure was calculated subjected to the ground motion with and without permanent displacement respectively.By comparing the seismic response of superstructure under the ground motion with and without permanent displacement,the influence of ground motion with permanent displacement on the seismic isolation design of this type of building was analyzed.The results show that:whether the ground motion contains permanent displacement or not,the inter-story shear force and overturning moment of the isolated structure are greatly reduced compared with the non-isolated structure,and the seismic isolation effect increases with the increase of the floor;subjected to ground motions with and without permanent displacement,there is no significant difference between the shear ratio and overturning moment ratio of each floor,and the ratio is basically about 1;under the action of two kinds of ground motions,the difference of calculated damping coefficient is no more than 10%;subjected to two kinds of ground motions,the average maximum tensile and compressive stress and displacement of the seismic isolators are similar,and the amplification effect of permanent displacement is not obvious.

关 键 词：长周期结构 钢结构 永久位移 隔震设计 

分 类 号：TU398.7[建筑科学—结构工程]