（1 广东省建筑设计研究院，广州 510000；2 华南理工大学亚热带建筑科学国家重点实验室，广州 510640）

[摘要]  普通的钢支撑多沿长度方向截面尺寸不变，在受轴力作用时变形小、刚度大、耗能能力较小，且受压时容易屈曲。为提高支撑的受力性能，提出了三种在普通钢管中间采用变截面的新型钢支撑，即凹凸钢支撑。对三种凹凸钢支撑分别进行试验分析，以研究支撑在循环荷载作用下的力学性能。研究表明，试件A的滞回曲线最饱满，延性较好；试件B的刚度和承载力最大，但滞回性能偏低；试件C由于中间段存在较大的偏心，除会产生附加弯矩降低支撑的承载力外，每端左右两侧的位移相差较大，拉压时的滞回曲线不对称。试件A、B受压时的延性较大，且仅发生在沿构件方向，不会发生整体失稳。

[关键词]  凹凸支撑；试验分析；滞回曲线；耗能能力

中图分类号：TU391    文献标注识码：A   文章编号：

*国家自然科学基金项目(51178192; 51378219; 51378009)。

作者简介：区彤，高工，一级注册结构工程师，Email：kogends@sina.com。

Experiment study on the mechanical properties for concave-convex steel braces

Ou Tong¹, Tan Jian¹, Chen Xing¹, Wang Zhan², Pan Jianrong², Hu Shujun² 

(1 Architectural Design and Research Institute of Guangdong Province, Guangzhou 510000, China;

2 State Key Laboratory of Subtropical Building Science, South China University of Technology, Guangzhou 510640, China)

Abstract: The common steel brace usually has a constant size along its longitudinal direction. It has characteristics of small deformation, high strength, small energy dissipation capacity and easily buckling in tension-compression stress. Based on changed sections at the internal of new steel braces, three types steel braces named of concave-convex steel braces were proposed to improve the mechanical properties. Experimental analysis was used to analyze the performance of these concave-convex steel braces under cyclic loading. The study shows that steel brace A has advantage of hysteretic curve plump loop and good ductility; steel brace B has the maximum stiffness and ultimate strength among these braces, but it does not have an ideal hysteretic behavior; due to the additional moment at the internal of steel brace C, the ultimate strength will be further decreased, and the displacements at left and right of each end have lager difference, the hysteretic curve is asymmetric under cyclic loading. In addition, steel brace A and B have big deformation under axial compressive force, which only occurs along the brace, so it can prevent from global instability.

Keywords: concave-convex brace；experimental study；hysteretic curve；energy dissipation capacity；

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