既有RC框架結(jié)構(gòu)BRB加固方案對比研究*
張國偉，陳鵬，吳徽，吳繼豐
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（北京建筑大學“工程結(jié)構(gòu)與新材料”北京高等學校工程研究中心， 北京 100044）
［摘要］為比較附加防屈曲支撐框架和附加搖擺防屈曲支撐框架加固既有RC框架結(jié)構(gòu)后的抗震性能，通過PERFORM 3D軟件對兩種加固方案下的一幢美國加州20世紀70年代14層RC框架結(jié)構(gòu)進行建模，采用基于性能的抗震設(shè)計方法對加固結(jié)構(gòu)進行靜力彈塑性分析和動力彈塑性時程分析，比較了兩種加固方案下結(jié)構(gòu)層間位移角、層間剪力、防屈曲支撐框架層間剪力比以及結(jié)構(gòu)底柱軸力的不同動力響應(yīng)。分析結(jié)果表明，采用附加搖擺防屈曲支撐框架加固既有RC框架結(jié)構(gòu)更為可行，研究為既有RC框架結(jié)構(gòu)抗震加固提供參考和指導。［關(guān)鍵詞］既有RC框架; 防屈曲支撐框架; 搖擺防屈曲支撐框架; 靜力彈塑性分析; 動力彈塑性時程分析中圖分類號：TU375.4 文獻標識碼：A 文章編號：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
*國家自然科學基金項目（51308026）。作者簡介：張國偉，博士，副教授，Email：zhangguowei@bucea.edu.cn。
