采用黏滯流體消能器加固的框架結(jié)構(gòu)抗震性能分析
閤東東1,2，萬金國2，李文峰2，苗啟松2
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（1 北京工業(yè)大學建筑工程學院， 北京 100124； 2 北京市建筑設計研究院有限公司， 北京 100045）
［摘要］對采用黏滯流體消能器（VFD）加固的某鋼筋混凝土框架結(jié)構(gòu)的抗震性能進行了研究。首先對采用不同阻尼系數(shù)和速度指數(shù)的VFD進行加固時結(jié)構(gòu)的附加阻尼比進行了比較，得到了較為合適的VFD參數(shù)。接著采用MSC.MARC軟件對原結(jié)構(gòu)和加固后的結(jié)構(gòu)進行了動力彈塑性時程分析與比較研究，開發(fā)了用于模擬鋼筋混凝土框架梁與柱的纖維梁單元子程序，采用分層殼單元模擬鋼筋混凝土樓板，對未加固和加固后的結(jié)構(gòu)位移、層間位移角等進行了考察，對VFD的地震反應進行了分析，并對關(guān)鍵構(gòu)件的應變-應力滯回關(guān)系進行了分析。分析結(jié)果表明，未加固結(jié)構(gòu)在罕遇地震下存在倒塌的風險，增設VFD可顯著提高結(jié)構(gòu)的抗震能力，結(jié)構(gòu)達到了“大震不倒”的抗震設防目標。［關(guān)鍵詞］黏滯流體消能器; 框架結(jié)構(gòu); 附加阻尼比; 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)05-0018-06
Seismic performance analysis of a frame structure strengthened with viscous fluid damperGe Dongdong1,2, Wan Jinguo2, Li Wenfeng2, Miao Qisong2(1 College of Architecture and Civil Engineering, Beijing University of Technology, Beijing 100124, China; 2 Beijing Institute of Architectural Design, Beijing 100045, China)Abstract:Seismic performance of a reinforced concrete frame structure strengthened by viscous fluid damper (VFD) was studied. At first, additional damping ratios of the VFD strengthened structure with different damping coefficients and velocity coefficients were compared to find the appropriate VFD coefficient. Then, dynamic elastic-plastic time history analysis was performed to analyze, compare and study the original structure and strengthened structure based on the program of MSC.MARC. User subroutine of fiber beam element used to simulate reinforced concrete columns and beams was developed. Multi-layer shell element was used to simulate reinforced concrete slab. Displacement and inter-story drift of both the original structure and strengthened structure were studied. Seismic response of VFD was investigated. Strain-stress hysteretic relationships of critical opponents were also analyzed. The analysis results show that there exists collapse risk for original un-strengthened structure subjected to rare earthquake. Seismic performance of the structure can be significantly improved by supplemental VFD. The third level seismic fortification objective which was "no-collapse under rare earthquake" of the strengthened structure can be achieved.Keywords:viscous fluid damper; frame structure; additional damping ratio; dynamic elasticplastic time history analysis
作者簡介： 閤東東，博士，高級工程師，一級注冊結(jié)構(gòu)工程師，Email：gddhust@163.com。
