高烈度区既有RC框架-剪力墙结构抗震加固易损性分析  

Fragility analysis of existing RC frame-shear wall structures with mixed seismic reinforcement in high intensity zone

作　　者：乔剑 陈鑫[1] 俞伟根[2] 刘涛[3] 孙勇[2] 朱燕清 QIAO Jian;CHEN Xin;YU Weigen;LIU Tao;SUN Yong;ZHU Yanqing(Jiangsu Province Key Laboratory of Structure Engineering,Suzhou University of Science and Technology,Suzhou 215011,China;Jiangsu Research Institute of Building Science Co.,Ltd.,Nanjing 210008,China;Department of Housing and Urban-rural Development of Jiangsu Province,Nanjing 210036,China)

机构地区：[1]苏州科技大学江苏省结构工程重点实验室,苏州215011 [2]江苏省建筑科学研究院有限公司,南京210008 [3]江苏省住房和城乡建设厅,南京210036

出　　处：《建筑结构》2021年第10期84-91,79,共9页Building Structure

基　　金：江苏省自然科学基金(BK20161581);江苏省六大人才高峰(JZ004);江苏省“333”工程科研项目(BRA2018372);江苏省高等学校自然科学研究重大项目(19KJA430019)。

摘　　要：大量既有高层建筑采用了RC框架-剪力墙结构体系,当其面临加固改造时,合理评估其抗震性能十分重要。围绕既有RC框架-剪力墙结构的混合抗震加固方案对结构抗震性能和抗倒塌能力提升的定量分析展开研究。首先,针对某酒店式公寓的加固改造工程,设计了粘贴碳纤维布和外包钢板的混合抗震加固方案。然后,基于纤维单元、分层壳单元以及GPU/CPU并行运算技术,对加固前后结构抗震性能和可恢复性能进行了评估。最后,开展了易损性分析,定量评价了结构加固前后的抗倒塌能力,并对比了近、远场地震动记录对结构抗倒塌能力评价结果的影响。结果表明:PGA=1g时,加固后可使得既有RC框架-剪力墙结构在近场地震、远场作用下的倒塌概率分别下降至9.09%,2.27%,分别为加固前的1/4.63,1/4。A large number of existing high-rise buildings adopt RC frame-shear wall structure system. When they are facing reinforcement and transformation, it is very important to evaluate their seismic performance reasonably. Around the existing RC frame-shear wall structure of hybrid seismic reinforcement scheme, the quantitative analysis of structural seismic performance and anti-collapse ability was carried out. First of all, for the reinforcement and reconstruction project of a hotel apartment, a hybrid seismic reinforcement scheme of pasting carbon fiber cloth and outsourcing steel plate was designed. Then, based on fiber element, layered shell element and GPU/CPU parallel computing technology, the seismic performance and recovery possibility of the structure before and after reinforcement were evaluated. Finally, the structural fragility analysis was carried out, and the anti-collapse ability of the structure before and after reinforcement was quantitatively evaluated, and the influence of near-field and far-field seismic records on the evaluation results of the anti-collapse ability of the structure was compared. The results show that, when PGA=1g, after reinforcement, the collapse probability of existing RC frame-shear wall structures under near-field earthquake and far-field earthquake can be reduced to 9.09% and 2.27%, which is only 1/4.63 and 1/4 before reinforcement.

关 键 词：RC框架-剪力墙结构 碳纤维布加固 外包钢加固 分层壳单元 易损性分析 抗震性能评估 

分 类 号：TU375[建筑科学—结构工程]