主余震序列作用下基础隔震结构地震损伤研究  

Seismic Damage of Base-Isolated Structure Under Main Shock-Aftershock Sequences

作　　者：刘洁亚 黄小宁 王宁[1,2] 杜永峰 张丹[1,2] LIU Jieya;HUANG Xiaoning;WANG Ning;DU Yongfeng;ZHANG Dan(College of Civil Engineering,Qinghai University Xining,810016,China;Qinghai Provincial Key Laboratory of Energy-Saving Building Materials and Engineering Safety Xining,810016,China;Institute of Earthquake Protection and Disaster Mitigation,Lanzhou University of Technology Lanzhou,730050,China)

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

出　　处：《振动．测试与诊断》2021年第6期1052-1058,1232,共8页Journal of Vibration,Measurement & Diagnosis

基　　金：青海省自然科学基金青年基金资助项目(2018-ZJ-938Q);青海省创新平台建设专项资助项目(2018-ZJ-T01)。

摘　　要：为了定量评估余震对基础隔震结构造成的损伤,采用损伤指数作为性能指标评估主余震序列作用下基础隔震结构的抗震性能。基于速度反应谱可以反映结构由外力作用产生的最大能量,提出一种基于力与能量双匹配的主余震序列型构造方法,将此构造方法构造出的人工主余震序列作为激励,对基础隔震结构进行弹塑性时程分析,并以地震损伤指数作为指标评估该结构的抗震性能。研究结果表明:基于力与能量双匹配的人工主余震序列构造方法可以有效模拟真实主余震序列地震动;对比分析基础隔震框架模型各工况下的损伤指数,发现随着余震峰值加速度的增加,上部结构损伤指数增长超过20%,下部隔震层损伤指数增长超过15%。余震的产生使损伤指数明显增大,结构发生严重破坏。To quantitatively assess the damage of base-isolated structures caused by aftershocks,the seismic performance of base-isolated structure under main shock-aftershock sequences is evaluated by damage index.The velocity response spectrum reflects the maximum energy of the structures produced by the external force.A main shock-aftershock sequence construction method based on the matching of force and energy is proposed,and the artificial main shock-aftershock sequence constructed by this method is used as an excitation.Moreover,the elastoplastic time-history analysis of the base-isolated structure is carried out,and the earthquake damage index is used to evaluate the seismic performance of the structure.The results show that the artificial main shockaftershock sequence construction method based on force and energy matching can effectively simulate the real main shock-aftershock sequence ground motion.Comparing the damage index of base-isolated frame model under each working condition,the peak acceleration of aftershocks increases,the damage index of the superstructure increases by over 20%,and the damage index of the lower isolation layer increases by over 15%.The aftershock makes the damage index increases obviously,and the structure is severely damaged.

关 键 词：主余震序列 基础隔震结构 速度反应谱 损伤指数 弹塑性时程分析 

分 类 号：TU375.4[建筑科学—结构工程] P315.31[天文地球—地震学]