某防屈曲支撐框架結構彈塑性時程分析
王奇1，干鋼1，方鴻強2
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王奇1，干鋼1，方鴻強2（1 浙江大學建筑設計研究院，杭州 310027； 2 漢嘉設計集團股份有限公司，杭州 310005）［摘要］結合現(xiàn)行國家規(guī)范與規(guī)程，采用彈塑性時程分析方法，對某防屈曲支撐框架結構進行抗震分析，探討該類結構在罕遇地震作用下的動力響應。重點討論了在罕遇地震作用下結構的基底剪力、剪重比、層間位移角、構件塑性發(fā)展過程以及防屈曲支撐滯回耗能特性。計算結果顯示，結構X向頂點最大位移為655mm，最大層間位移角為1/111；Y向頂點最大位移為745mm，最大層間位移角為1/103，均滿足抗震規(guī)范的相關要求。動力彈塑性分析結果顯示，無論從桿件塑性鉸出現(xiàn)情況，還是從桿件的地震響應，以及不同位置防屈曲支撐的滯回曲線都可以看出，防屈曲支撐有效地吸收了一部分地震動傳給結構的能量，減小了其地震響應。［關鍵詞］彈塑性時程分析； 塑性鉸； 防屈曲支撐； 抗震分析中圖分類號：TU3132，TU3521+1文獻標識碼：A文章編號：1002848X(2012)11004405Elasto-plastic time history analysis on a buckling-restrained braced framesWang Qi1, Gan Gang1, Fang Hongqiang2（1 Architectural Design and Research Institute of Zhejiang University, Hangzhou 310027, China; 2 Hanjia Design Group Co., Ltd., Hangzhou 310005, China）Abstract: Combined with present national codes and regulations, elasto-plastic time history analysis on buckling-restrained braced frames was carried out. The dynamic response of this kind of structure under rare earthquake was discussed. The base shear force, shear-weight ratio, inter-story drift, plastic development process of the whole structure and hysteresis characteristic of buckling-restrained braces were studied. The analysis results show that the maximum shift on X direction is 655mm and the inter-story drift is 1/111, meanwhile the maximum shift on Y direction is 745mm and the inter-story drift is 1/103, and it is in good requirement with the code of seismic. The elasto-plastic time history analysis results show that no matter the appearance of plastic hinges, or the seismic response of members, even the hysteretic curves of buckling-restrained braces on different positions all indicate that a part of ground motion energy which passed to the structure is effectively absorbed by the buckling-restrained braces, and the seismic response is also reduced.Keywords: elasto-plastic time history analysis; plastic hinge; bucklingrestrained brace; seismic analysis作者簡介：王奇，博士，工程師，Email: wangqi@zju.edu.cn。參考文獻［1］ YOSHINO T, KARINO Y. Experimental study on shear wall with braces: Part 2［C］//Summaries of technical papers of annual meeting, Architectural Institute of Japan, Japan: 1971.［2］ WAKABAYASHI M, NAKAMURA T, KATAGIHARA A, et al. Experimental study on the elastoplastic behavior of braces enclosed by precast concrete panels under horizontal cyclic loading［C］ // Summaries of technical papers of annual meeting, Kinki Branch of the Architectural Institute of Japan, Japan: 1973.［3］ KIMURA K, YOSHIOKA, TAKEDA T, et al. Tests on braces encased by motar infilled steel tubes［C］ //Summaries of technical papers of annual meeting, Architectural Institute of Japan, Japan: 1976.［4］ 劉建彬. 防屈曲支撐及防屈曲支撐鋼框架的設計理論研究［D］. 北京: 清華大學, 2005.［5］ 張小冬, 劉界鵬. 大連中國石油大廈結構方案優(yōu)化設計［J］. 建筑結構學報, 2009,30(S1):2733.［6］ 張舉濤. 蘭州云天皇冠酒店主樓混合結構設計［J］. 建筑設計管理, 2010,27(1):4345.
