- 摘 要
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(1 同濟大學建筑工程系, 上海 200092;2 同濟大學土木工程防災國家重點實驗室, 上海 200092)
[摘要]對鉸接框架內(nèi)一組拉壓分段正交扁鋼支撐進行靜力試驗,同時考察該類支撐在軸心壓力作用下的失穩(wěn)方向和在軸心拉力作用下的延性性能。試驗結(jié)果表明,分段正交扁鋼支撐在正常使用極限狀態(tài)下能夠?qū)⑹Х€(wěn)方向控制在墻面內(nèi),避免墻體受損而影響結(jié)構(gòu)適用性,并且支撐的初始缺陷往往對實現(xiàn)上述目標起到有利作用;抗拉支撐在層間位移角達到1/15時僅發(fā)生塑性伸長而未出現(xiàn)斷裂,且塑性伸長僅發(fā)生在扁鋼部分而張緊連接部分處于彈性狀態(tài),滿足“強連接弱桿件”的要求,具有良好的延性。
[關(guān)鍵詞]鋼結(jié)構(gòu); 支撐; 失穩(wěn)方向; 延性; 試驗研究
中圖分類號:TU391 文獻標識碼:A 文章編號:1002-848X(2014)07-0080-04
Experimental research on the segmented orthogonal flat steel brace
Xu Ting1, Chen Yiyi1,2
(1 Department of Building Engineering, Tongji University, Shanghai 200092, China; 2 State Key Laboratory for Disaster Reduction in Civil Engineering, Tongji University, Shanghai 200092, China)
Abstract: A static test was conducted to a pair of tension-compression segmented orthogonal flat steel braces which are inside a hinged frame, so as to investigate the instability direction under axial compression and the ductility under axial tension of braces of this kind at the same time. Test result shows that the instability direction of the segmented orthogonal flat steel brace can be controlled within the wall plane under serviceability limit state so as to avoid the damage of wall and the influence on structure serviceability, and that the initial defects of the brace tend to play a advantageous role in the realization of the above purpose. Also it shows that the tensile brace only develops a plastic elongation without a fracture when the inter-story drift angle approaches to 1/15, and that the plastic elongation only occurs in the flat steel part while the tensioned connection part is under elastic state, which satisfies the requirement of strong connection and weak member. Tensile brace of this kind possesses good ductility.
Keywords: steel structure; brace; instability direction; ductility; experimental research
*國家自然科學基金項目(51038008)。
通訊作者:陳以一,博士,教授,Email:yiyichen@#edu.cn。
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