适用于区域RC框架结构隔震韧性提升的简化模型  

A SIMPLIFIED MODEL FOR SEISMIC RESILIENCE IMPROVEMENT OF REGIONAL RC FRAME STRUCTURES USING SEISMIC ISOLATION

作　　者：卢嘉茗 解琳琳 李爱群[1,2,3] 曾德民 杨参天[1,2,3] 刘谦敏[4] LU Jia-ming;XIE Lin-lin;LI Ai-qun;ZENG De-min;YANG Can-tian;LIU Qian-min(School of Civil and Transportation Engineering,Beijing University of Civil Engineering and Architecture,Beijing 100044,China;Beijing Higher Institution Engineering Research Center of Civil Engineering Structure and Renewable Material,Beijing University of Civil Engineering and Architecture,Beijing 100044,China;School of Civil Engineering,Southeast University,Nanjing 210096,China;China Beijing Institute of Architectural Design,Beijing 100045,China)

机构地区：[1]北京建筑大学土木与交通工程学院,北京100044 [2]北京建筑大学“工程结构与新材料”北京市高等学校工程研究中心,北京100044 [3]东南大学土木工程学院,南京210096 [4]北京市建筑设计研究院有限公司,北京100045

出　　处：《工程力学》2019年第8期226-234,247,共10页Engineering Mechanics

基　　金：北京市自然科学基金项目(8192008);北京未来城市设计高精尖创新中心项目(UDC2016030200);长江学者和创新团队发展计划资助项目(IRT_17R06);北京建筑大学校级教改项目(Y1832),北京建筑大学研究生创新项目(PG2018025,PG2018030)

摘　　要：近年来,区域建筑地震韧性提升已逐渐成为国际防震减灾领域的研究热点。该文以典型区域建筑RC框架结构为例,综合考虑区域计算效率和精度,以关键设计指标把握能力、关键结构响应预测能力和韧性水准评价结果为核心目标,研究了适用于该类结构隔震韧性提升的简化模型。基于基本案例,首先评价了广泛使用的基于剪切梁的组合简化模型的精度,结果表明:该模型无法把握关键设计指标底部剪力比,更重要的是无法预测影响韧性水准的关键结构响应最大楼面绝对加速度。鉴于此,该文建议了一种基于铁木辛柯梁的组合简化模型,可准确把握上述关键设计指标和结构响应。以一栋既有RC框架结构为例,实现了基于该简化模型的隔震韧性提升,并用于指导该结构的隔震韧性提升实际工程设计,结果表明:该模型可较好把握关键设计指标和预测关键结构响应,且韧性评价结果与精细模型评价结果相对误差小于4.5%,而基于剪切梁的组合简化模型预测的修复费用和工时误差分别高达177%和31.5%,表明该文建议的简化模型可服务于区域RC框架结构的隔震韧性提升。Seismic resilience of structures has become a critical issue in earthquake engineering worldwide,recently.RC frame structure,as a typical structure,is selected as the research object here.Considering the computational efficiency and accuracy,a simplified model for it was suggested and investigated with emphasis put on the critical requirements of seismic resilience of RC frames with seismic isolation,including the capacities of predicting critical design indices,seismic responses and resilient performance.Employing a basic case,the prediction accuracy of the widely-used hybrid simplified model based on shear beam (referred to as “HSS model” hereafter) was evaluated firstly.The results indicate that such model cannot predict the critical design index (i.e.base shear ratio) well.Furthermore,it is not capable of predicting the maximum absolute floor acceleration,which is the critical seismic response affecting seismic resilience.In view of these,a hybrid simplified model based on Timoshenko beam (referred to as “HST model” hereafter) was recommended and validated to be capable of predicting the abovementioned critical design index and seismic response.Based on this model,the seismic resilience improvement using seismic isolation was analyzed for an existing RC frame structure.Subsequently,the corresponding results were used to guide the detailed design of seismic isolation scheme.The results indicate that HST model can well predict the critical design index and seismic response.Furthermore,the relative errors of resilient performances predicted by the refined model and HST model are less than 4.5%.In contrast,relative errors are as large as 177% and 31.5% for the repair cost and repair time predicted by HSS model,respectively.The research outcome proves that the recommended model (i.e.HST model) can be used for analyzing the seismic resilience improvement based on seismic isolation.

关 键 词：RC框架结构 韧性提升 隔震 简化模型 底部剪力比 楼面绝对加速度 

分 类 号：P315.9[天文地球—地震学] TU375[天文地球—固体地球物理学]