（1 廣東省建筑設(shè)計研究院，廣州 510000；2 華南理工大學(xué)亞熱帶建筑科學(xué)國家重點實驗室，廣州 510640）

[摘要]  普通的鋼支撐多沿長度方向截面尺寸不變，在受軸力作用時變形小、剛度大、耗能能力較小，且受壓時容易屈曲。為提高支撐的受力性能，提出了三種在普通鋼管中間采用變截面的新型鋼支撐，即凹凸鋼支撐。對三種凹凸鋼支撐分別進行試驗分析，以研究支撐在循環(huán)荷載作用下的力學(xué)性能。研究表明，試件A的滯回曲線最飽滿，延性較好；試件B的剛度和承載力最大，但滯回性能偏低；試件C由于中間段存在較大的偏心，除會產(chǎn)生附加彎矩降低支撐的承載力外，每端左右兩側(cè)的位移相差較大，拉壓時的滯回曲線不對稱。試件A、B受壓時的延性較大，且僅發(fā)生在沿構(gòu)件方向，不會發(fā)生整體失穩(wěn)。

[關(guān)鍵詞]  凹凸支撐；試驗分析；滯回曲線；耗能能力

中圖分類號：TU391    文獻標(biāo)注識碼：A   文章編號：

*國家自然科學(xué)基金項目(51178192; 51378219; 51378009)。

作者簡介：區(qū)彤，高工，一級注冊結(jié)構(gòu)工程師，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；

參 考 文 獻

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