某防屈曲支撑框架结构弹塑性时程分析
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王奇1，干钢1，方鸿强2（1 浙江大学建筑设计研究院，杭州 310027； 2 汉嘉设计集团股份有限公司，杭州 310005）［摘要］结合现行国家规范与规程，采用弹塑性时程分析方法，对某防屈曲支撑框架结构进行抗震分析，探讨该类结构在罕遇地震作用下的动力响应。重点讨论了在罕遇地震作用下结构的基底剪力、剪重比、层间位移角、构件塑性发展过程以及防屈曲支撑滞回耗能特性。计算结果显示，结构X向顶点最大位移为655mm，最大层间位移角为1/111；Y向顶点最大位移为745mm，最大层间位移角为1/103，均满足抗震规范的相关要求。动力弹塑性分析结果显示，无论从杆件塑性铰出现情况，还是从杆件的地震响应，以及不同位置防屈曲支撑的滞回曲线都可以看出，防屈曲支撑有效地吸收了一部分地震动传给结构的能量，减小了其地震响应。［关键词］弹塑性时程分析； 塑性铰； 防屈曲支撑； 抗震分析中图分类号：TU3132，TU3521+1文献标识码：A文章编号：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作者简介：王奇，博士，工程师，Email: wangqi@zju.edu.cn。参考文献［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］ 刘建彬. 防屈曲支撑及防屈曲支撑钢框架的设计理论研究［D］. 北京: 清华大学, 2005.［5］ 张小冬, 刘界鹏. 大连中国石油大厦结构方案优化设计［J］. 建筑结构学报, 2009,30(S1):2733.［6］ 张举涛. 兰州云天皇冠酒店主楼混合结构设计［J］. 建筑设计管理, 2010,27(1):4345.
