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近场地震作用下钢筋混凝土框架加固前后抗震性能分析*
朱燕清1,陈鑫1,孙勇2,俞伟根2,李家青2,苏冠兴2,徐庆阳3
摘 要

(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 南京审计大学江苏省公共工程审计重点实验室, 南京 211815)

[摘要]围绕偏心钢筋混凝土框架的加固设计和抗震性能开展研究。首先,介绍了某公司多层生产车间的结构特点,并综合利用增大截面、粘贴钢板和粘贴FRP等方法进行了结构抗震加固设计,验算了构件截面;随后,建立了结构三维有限元模型,开展了动力特性和弹性时程分析,探讨结构的偏心不规则情况;最后,进行了结构在远场和近场地震作用下的动力弹塑性分析,对比分析了综合加固方案对结构抗震性能的改善和远、近场地震对多层偏心钢筋混凝土框架抗震性能的影响。研究结果表明:该结构近场地震工况下的响应大于远场地震工况,罕遇地震作用下底层层间位移角在近场地震工况可达远场地震工况的3-8倍;所设计的加固方案有效提升了结构抗震性能,罕遇地震作用下底层层间位移角平均减少75-9%。

[关键词]偏心钢筋混凝土框架; 加固设计; 碳纤维; 近场地震; 抗震性能

中图分类号:TU352-1+1, TU3754文献标识码:A文章编号:1002-848X(2018)24-0103-08

 

Analysis on seismic performance of reinforced concrete frame without and with reinforcement subjected to near-field earthquake

Zhu Yanqing1, Chen Xin1, Sun Yong2, Yu Weigen2, Li Jiaqing2, Su Guanxing2, Xu Qingyang3

(1 Jiangsu Province Key Laboratory of Structure Engineering, Suzhou University of Science and Technology, Suzhou 215011, China; 2 Jiangsu Research Institute of Building Science Co.,Ltd., Nanjing 210008, China; 3  Jiangsu Province Key Laboratory of  Public Project Audit, Nangjing Audit University, Nanjing 211815, China)

Abstract:The reinforcement design and seismic performance analysis of a asymmetric reinforced concrete frame were investigated. Firstly, the structure characteristics of a company′s multi-story production workshop was introduced, then the seismic reinforced  design was conducted using the methods of enlarging sections, sticking steel plates and sticking FRP, and  the sections of the components were verified. Secondly, a three-dimensional finite element mode of the structure was established, and both the dynamic characteristics and elastic time-histories analysis were carried to discuss the eccentric irregularity of the structure. Finally, the dynamic elastic-plastic analyses of the structure were conducted under both far-field and near-field earthquake, then the improvement of the seismic performance of the reinforced structure were analyzed, and the influence of far-field and near-field earthquakes on the seismic performance of the multi-story eccentric reinforced concrete frame were compared. The results show that the response of the structure under  near-field earthquake is greater than that under  far-field earthquake, and when subjected to the rare earthquake, the structure′s bottom story drift under near-field earthquake is 3-8 times   that under far-field earthquake. The designed reinforced scheme has effectively improved the seismic performance of the structure and the average reduction of the bottom story drift is 75-9%.

Keywords:asymmetric reinforced concrete frame; reinforcement design; carbon fiber; near-field earthquake; seismic performance

 

*国家重点研发计划(2016YFC0701600),国家自然科学基金(51408389),江苏省自然科学基金(BK20161581, BK20181078),江苏省“青蓝工程”,江苏省住房和城乡建设厅节能减排专项(苏财建【2017】131号),苏州市市级建设科研项目(20189),江苏省高校自然科学研究面上项目(14KJB560012)。

 

通讯作者:陈鑫,博士,副教授,Email:civil.chenxin@gmail.com。

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