- 摘 要
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(1 同濟大學土木工程防災國家重點實驗室,上海 200092;2 同濟大學土木工程學院建筑工程系,上海 200092;3 中國建筑設計研究院,北京 100044)
[摘要]依據(jù)不同設計準則分別采用國產(chǎn)熱軋Q235B,BLY225兩種鋼材設計了三種截面形式的TJ型屈曲約束支撐構件。通過低周往復加載試驗,研究了該類構件的滯回曲線、骨架曲線、累計塑性應變、附加等效阻尼比以及支撐核心區(qū)相對長度對其抗震性能的影響。試驗結(jié)果表明,該類型屈曲約束支撐滯回曲線飽滿,具有穩(wěn)定的受力特性和優(yōu)良的延性及低周疲勞性能。根據(jù)試驗構件的滯回曲線提出了基于Bouc-Wen模型的修正滯回模型,該模型的擬合滯回曲線與試驗結(jié)果吻合較好。
[關鍵詞]屈曲約束支撐; 低周往復荷載; 屈服荷載; 累計塑性應變; 相對塑性區(qū)長度; 拉壓不對稱
中圖分類號:TU352.1 文獻標識碼:A 文章編號: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
*國家科技支撐計劃資助(2012BAJ13B02)。
作者簡介:李國強,教授,博士生導師,Email: gqli@#edu.cn。
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