LRB基础隔震结构在极罕遇地震作用下的抗震性能研究  

Seismic behavior of LRB base-isolated structure under extreme rare earthquakes

作　　者：黄潇 刘运林 胡志祥[2] HUANG Xiao;LIU Yunlin;HU Zhixiang(School of Civil Engineering,Anhui Jianzhu University,Hefei 230601,China;School of Civil and Hydraulic Engineering,Hefei University of Technology,Hefei 230009,China)

机构地区：[1]安徽建筑大学土木工程学院,安徽合肥230601 [2]合肥工业大学土木与水利工程学院,安徽合肥230009

出　　处：《地震工程与工程振动》2021年第4期233-243,共11页Earthquake Engineering and Engineering Dynamics

基　　金：住房和城乡建设部2019年科学技术项目计划(2019-K-085);安徽省自然基金项目(1908085ME144);安徽建筑大学科研基金项目(2019QDZ51);安徽省高校省级自然科学研究项目-重点项目(KJ2020A0451)。

摘　　要：以典型的四层、六层和八层LRB(铅芯橡胶隔震支座)基础隔震结构为研究对象,通过大量的弹塑性时程分析,对极罕遇地震作用下的地震响应特点进行了分析;采用参数化方法,研究了隔震系统的力学性能参数和上部结构屈服强度比的变化对LRB基础隔震结构抗震性能的影响。结果表明:在极罕遇地震作用下,LRB基础隔震结构上部结构首层的层间位移角和延性系数明显增大;延长LRB隔震系统的隔震周期或选择最优的特征屈服强度比,均可显著降低上部结构的塑性变形程度,但LRB屈服位移的变化对隔震结构的响应几乎无影响;LRB隔震系统参数确定后,隔震结构上部结构的损伤状态主要与上部结构力学性能参数中的屈服强度比相关,增大上部结构的屈服强度比,可以显著降低上部结构的层间位移角和延性系数,但是隔震支座的平均最大剪应变会增大,可以选用橡胶剪切模量大或者直径大、第二形状系数小的LRB隔震支座。A typical four-,six-and eight-layer LRB(lead-core rubber isolation support)base-isolated structures are taken as research object.Seismic response characteristics were obtained by a large number of analysis.The effect of mechanical parameters of LRB and yield strength ratio of superstructure on seismic performance of LRB base-isolated structures are studied by parameterization method.According to the analysis results,the drift ratio and ductility coefficient of the first floor of the superstructure increased significantly under extreme rare earthquake.Extending the isolation period of LRB or selecting an optimal characteristic yield strength ratio can significantly reduce the plastic deformation of the superstructure,but the response will not change with LRB yield displacement.The damage state of the superstructure is mainly related to the yield strength ratio,and increasing the yield strength ratio of the superstructure can significantly reduce the drift ratio and ductility coefficient of the superstructure,however,the average maximum shear strain of LRB will increase,so LRB with larger shear modulus or larger diameter and smaller second shape coefficient can be selected.

关 键 词：基础隔震结构 铅芯橡胶隔震支座 极罕遇地震 弹塑性时程分析 抗震性能 

分 类 号：TU352.12[建筑科学—结构工程]