剪力墻連梁剛度折減系數(shù)確定方法研究
范重1，劉云博1,2，邢超1，劉家名1
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(1 中國(guó)建筑設(shè)計(jì)研究院， 北京 100044； 2 北京建筑大學(xué)土木與交通工程學(xué)院， 北京 100044)
［摘要］采用非線性有限元法建立了連梁精細(xì)彈塑性模型，通過(guò)滯回性能分析與能量等效方法得到用于連梁彈塑性分析的彎矩-轉(zhuǎn)角骨架曲線。對(duì)剪力墻結(jié)構(gòu)分別進(jìn)行小震和中震作用下的彈塑性時(shí)程分析，研究連梁剛度退化與結(jié)構(gòu)耗能情況。根據(jù)連梁的彈塑性響應(yīng)，確定連梁的等效剛度折減系數(shù)。考察剪力墻結(jié)構(gòu)在地震作用下的能量耗散情況以及連梁與墻肢塑性的發(fā)展特點(diǎn)，將結(jié)構(gòu)的塑性耗能轉(zhuǎn)化為附加阻尼能。采用前述所得連梁剛度折減系數(shù)與等效阻尼比對(duì)剪力墻結(jié)構(gòu)進(jìn)行反應(yīng)譜法計(jì)算，并與彈塑性時(shí)程法進(jìn)行對(duì)比，驗(yàn)證了本文方法的合理性。［關(guān)鍵詞］連梁; 滯回曲線; 剛度折減系數(shù); 等效阻尼比; 反應(yīng)譜法; 時(shí)程法中圖分類號(hào)：TU318，TU973 文獻(xiàn)標(biāo)識(shí)碼：A 文章編號(hào)：1002-848X(2015)23-0015-06
Study on determination method of stiffness reduction factor of coupling beams in shear wall structuresFan Zhong1, Liu Yunbo1,2, Xing Chao1, Liu Jiaming1(1 China Architecture Design & Research Group, Beijing 100044, China; 2 School of Civil Engineering and Transportation, Beijing University of Civil Engineering and Architecture, Beijing 100044, China)Abstract: A precise elasto-plastic model of the coupling beam in shear wall structures was established by nonlinear finite element method. By analyzing its hysteresis performance and using the energy equivalence method, the simplified moment-rotation skeleton curve of the coupling beam was derived for elasto-plastic analysis. The stiffness degradation and the structural energy dissipation of coupling beams were studied through elasto-plastic time-history analysis on shear wall structure under frequent earthquake and fortification earthquake respectively and the equivalent stiffness reduction factor of the coupling beams was determined according to elasto-plastic responses of coupling beams. The energy dissipation behavior of the shear wall structure under the earthquake action was investigated as well as the plasticity development characteristics in the coupling beams and wall piers. And the plastic energy dissipation was converted into additional damping energy. By adopting the proposed stiffness reduction factor of coupling beam and equivalent structural damping ratio, the results of shear wall structure calculated by response spectrum method were compared with those of elasto-plastic time-history method to verify the rationality of proposed method.Keywords: coupling beam; hysteresis curve; stiffness reduction factor; equivalent damping ratio; response spectrum method; time-history method
作者簡(jiǎn)介：范重，博士，教授級(jí)高級(jí)工程師，一級(jí)注冊(cè)結(jié)構(gòu)工程師，Email: fanz@cadg.cn。
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