既有RC框架结构BRB加固方案对比研究*
- 摘 要
-
（北京建筑大学“工程结构与新材料”北京高等学校工程研究中心， 北京 100044）
［摘要］为比较附加防屈曲支撑框架和附加摇摆防屈曲支撑框架加固既有RC框架结构后的抗震性能，通过PERFORM 3D软件对两种加固方案下的一幢美国加州20世纪70年代14层RC框架结构进行建模，采用基于性能的抗震设计方法对加固结构进行静力弹塑性分析和动力弹塑性时程分析，比较了两种加固方案下结构层间位移角、层间剪力、防屈曲支撑框架层间剪力比以及结构底柱轴力的不同动力响应。分析结果表明，采用附加摇摆防屈曲支撑框架加固既有RC框架结构更为可行，研究为既有RC框架结构抗震加固提供参考和指导。［关键词］既有RC框架; 防屈曲支撑框架; 摇摆防屈曲支撑框架; 静力弹塑性分析; 动力弹塑性时程分析中图分类号：TU375.4 文献标识码：A 文章编号：1002-848X(2016)05-0034-06
Comparative study on retrofitting schemes of existing RC frame structuresZhang Guowei, Chen Peng, Wu Hui, Wu Jifeng(Beijing Higher Institution Engineering Research Center of Civil Engineering Structure and Renewable Material, Beijing University of Civil Engineering and Architecture, Beijing 100044, China)Abstract:To compare seismic performance of existing RC frame structures retrofitted by buckling restrained braces frame (BRBF) and rocking buckling restrained brace frame (RBRBF) respectively, a 14-story RC building built in 1970s in California was modeled for two retrofitting schemes through PERFORM 3D software.Performance-based seismic design method was used to carry out static elastic-plastic analysis and dynamic elastic-plastic time-history analysis on the retrofitted structures. Dynamic responses of the two types of retrofitted structure models were compared including different parameters of inter-story drift, story shear, BRB's story shear ratio and axial force of bottom column. Analysis results show that it is more reliable for existing RC frame retrofitted with RBRBF, which provides reference and guidance for retrofitting of existing RC frame structures.Keywords:existing RC frame; buckling restrained brace frame; rocking buckling restrained brace frame; static elastic-plastic analysis; dynamic elastic-plastic time history analysis
*国家自然科学基金项目（51308026）。作者简介：张国伟，博士，副教授，Email：zhangguowei@bucea.edu.cn。
