（1 同济大学土木工程防灾国家重点实验室，上海 200092；2 同济大学土木工程学院建筑工程系，上海 200092；3 中国建筑设计研究院，北京 100044）

［摘要］依据不同设计准则分别采用国产热轧Q235B，BLY225两种钢材设计了三种截面形式的TJ型屈曲约束支撑构件。通过低周往复加载试验，研究了该类构件的滞回曲线、骨架曲线、累计塑性应变、附加等效阻尼比以及支撑核心区相对长度对其抗震性能的影响。试验结果表明，该类型屈曲约束支撑滞回曲线饱满，具有稳定的受力特性和优良的延性及低周疲劳性能。根据试验构件的滞回曲线提出了基于Bouc-Wen模型的修正滞回模型，该模型的拟合滞回曲线与试验结果吻合较好。

［关键词］屈曲约束支撑; 低周往复荷载; 屈服荷载; 累计塑性应变; 相对塑性区长度; 拉压不对称

中图分类号：TU352.1      文献标识码：A       文章编号：1002-848X(2014)18-0071-08

Experimental study on the aseismic performance of buckling-restrained braces

Li Guoqiang1,2, Sun Feifei1,2, Deng Zhongliang3, Guo Xiaokang2, Jin Huajian2

 (1 State Key Laboratory for Disaster Reduction in Civil Engineering, Tongji University, Shanghai 200092, China; 2 Building Department, College of Civil Engineering, Tongji University, Shanghai 200092, China; 3 China Architectural Design & Research Group, Beijing 100044, China)

Abstract: Based on diverse design principles, three different sections of TJ type buckling-restrained braces(TJ-BRB) were designed with domestic hot-rolled Q235B and BLY225 steel materials. Through low-cyclic loading experiments, the influences of respective hysteresis curves, skeleton curves, the cumulating plastic strain, additional equivalent damping ratio and relative length of the brace core on its anti-seismic property were studied. The experimental analysis showes that TJ-BRB has steady mechanical property, excellent ductility and low-cyclic fatigue property with considerable full hysteresis curves. Furthermore, according to hysteresis curves of experiment member, modified hysteresis model based on Bouc-Wen model was proposed, which matched well with the experimental results.

Keywords: buckling-restrained brace; low-cyclic loading; yielding load; cumulating plastic strain; relative length of the plastic core; asymmetrical property of tension and compression

*国家科技支撑计划资助（2012BAJ13B02）。

作者简介：李国强，教授，博士生导师，Email: gqli@tongji.edu.cn。

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