钢筋混凝土剪力墙和连梁易损性曲线研究  

FRAGILITY CURVES OF REINFORCED CONCRETE SHEAR WALLS AND COUPLING BEAMS

作　　者：纪晓东[1] 徐梦超 庄赟城 江枣 JI Xiao-dong;XU Meng-chao;ZHUANG Yun-cheng;JIANG Zao(Key Laboratory of Civil Engineering Safety and Durability of China Education Ministry,Beijing 100084,China;Architecture Design and Research Institute of Tsinghua University Co.,Ltd.,Tsinghua University,Beijing 100084,China)

机构地区：[1]清华大学土木工程安全与耐久教育部重点实验室,北京100084 [2]清华大学建筑设计研究院有限公司,北京100084

出　　处：《工程力学》2020年第4期205-216,共12页Engineering Mechanics

基　　金：国家重点研发计划课题项目(2017YFC1500602);山东省高校土木结构防灾减灾协同创新中心基金资助项目(XTZ201905)。

摘　　要：构件易损性曲线表征了构件的指标参量(如位移角、转角等)与达到某个指定损伤等级的概率之间的函数关系,可用于评价构件的损伤程度和确定修复方法,是结构抗震性能和韧性评价的重要依据。该文对满足中国GB 50011―2010《建筑抗震设计规范》要求的74个钢筋混凝土(RC)剪力墙试件和32个RC连梁试件的试验数据进行了统计分析,确定了构件的各损伤等级对应的损伤状态现象及相应的修复方法;并分别采用位移角和连梁转角为指标参量,建立了RC剪力墙和连梁的易损性曲线。分析讨论了设计轴压比对RC剪力墙易损性曲线的影响,以及跨高比对RC连梁易损性曲线的影响。比较了该文建立的易损性曲线和美国FEMA P-58规定的易损性曲线,并分析了两者差异原因。A component fragility curve depicts a statistical distribution that indicates the conditional probability of incurring damage at a given value of engineering demand parameter(e.g.,lateral drift,rotation etc.).Component fragility curves are used for estimating the damage state and retrofitting method of components,which form the basis of assessment of structural seismic performance and resilience.Experimental data of 74 reinforced concrete(RC)shear wall specimens and 32 RC coupling beam specimens are collected and analyzed.All selected specimens satisfy the requirements of the Chinese code for seismic design of buildings(GB 50011-2010).After defining the damage states and corresponding retrofitting methods,the fragility curves of RC walls and coupling beams are developed,respectively,using the drift ratio and beam chord rotation as the engineering demand parameter.Furthermore,the influence of design axial force ratio on the fragility curves of RC walls and that of span-to-depth ratio on the fragility curves of RC coupling beams are analyzed and discussed.Finally,the developed fragility curves are compared with those in FEMA P-58.The difference between the two sets of fragility curves is discussed as well.

关 键 词：RC剪力墙 RC连梁 易损性曲线 损伤状态 修复方法 

分 类 号：TU352.1[建筑科学—结构工程]