高层隔震结构摇摆提离效应与易损性初探  

Investigation on the Rocking Effect and Fragility Analysis of High-Rise Isolated Structures

作　　者：吴姜霖 杨巧荣[1] 张强[1] 李雪 WU Jianglin;YANG Qiaorong;ZHANG Qiang;LI Xue(Department of Civil Engineering,Engineering Research Center on Seismic Isolation Technology of NPP Structure,Shanghai University,Shanghai 200444,China)

机构地区：[1]上海大学土木工程系,核电站隔震减震工程技术研究中心,上海200444

出　　处：《结构工程师》2021年第2期93-101,共9页Structural Engineers

基　　金：国家自然科学基金(51778355,51778356)。

摘　　要：为了评估高层隔震结构在强震作用下存在的摇摆倾覆风险,基于叠层橡胶支座的拉伸临界性能状态,建立了高层隔震结构的摇摆倾覆界限理论,并给出了支座拉伸界限、支座损伤界限和结构倒塌界限三个临界角度的表达式。进一步选取隔震层摇摆角度为工程需求参数(Engineering Demand Parameter,EDP),通过IDA分析得到结构性能曲线,完成了不同高宽比框架剪力墙结构的易损性分析,并讨论了地震动特性对摇摆倾覆易损性的影响,结果表明远场地震动以及脉冲型地震作用下结构损伤概率更大,结构的高宽比越大损伤概率越高,地震动峰值为0.5 g时,结构高宽比为6、4.5和3时,支座损伤概率分别为45%、10%和0。In order to evaluate the risk of rocking and overturning of high-rise isolated structures under strong earthquakes,based on the critical states of tensile performance of laminated rubber bearings,the theory of rocking and overturning limits of high-rise isolated structures is established.The formulae of the three limit angles,tensile limit,damage limit,and collapse limit are introduced.The rocking angle of the isolation layer is selected as the engineering demand parameter(EDP),and the structural performance curve is obtained through incremental dynamic analysis.The vulnerability analysis of the frame shear wall structures with different aspect ratios is completed,and the influence of the ground motion characteristics is discussed.The results show that the probability of structural damage is greater under far-field and pulse earthquakes,the greater the aspect ratio of the structures,the higher the probability of damage.The damage probability of structures with aspect ratio of 6,4.5 and 3 are 45%,10%and 0,respectively under a PGA of 0.5 g.

关 键 词：高层隔震结构 支座性能状态 摇摆界限性能 易损性分析 

分 类 号：TU973.31[建筑科学—结构工程]