帶間隙拉索保護的屈曲約束支撐受力性能研究*
顧志超1,吳京1,王春林1,李銘2
- 摘 要
-
顧志超1,吳京1,王春林1,李銘2（1 東南大學(xué)混凝土及預(yù)應(yīng)力混凝土結(jié)構(gòu)教育部重點實驗室, 南京 210096；2 南京市建筑設(shè)計研究院有限責(zé)任公司, 南京 210005）［摘要］提出并介紹帶間隙拉索保護的屈曲約束支撐(GT-BRB)的構(gòu)造和力學(xué)性能，詳細(xì)推導(dǎo)了其各階段的剛度特性。GT-BRB的剛度特性可視為普通BRB與帶間隙拉索剛度特性的疊加，它在大變形時體現(xiàn)出顯著的第三剛度特性，其卸載剛度特性與最大應(yīng)變幅有關(guān)；在受壓狀態(tài)下體現(xiàn)出的第三剛度略小于受拉狀態(tài)下的第三剛度。對一個安裝有GT-BRB的兩層結(jié)構(gòu)建立模型并進行了有限元分析，結(jié)果表明GT-BRB有利于減小結(jié)構(gòu)的薄弱層效應(yīng)，可進一步提高框架抗倒塌能力。［關(guān)鍵詞］GT-BRB; 構(gòu)造方式; 剛度特性; 第三剛度; 抗倒塌能力中圖分類號：TU323.2 文獻(xiàn)標(biāo)識碼：A 文章編號：1002-848X(2013)19-0078-05Research on behavior of buckling-restrained brace with gapped tendon protectionsGu Zhichao1, Wu Jing1, Wang Chunlin1, Li Ming2(1 Key Laboratory of C & PC Structures, Ministry of Education, Southeast University, Nanjing 210096, China; 2 Nanjing Architectural Design and Research Institute Co., Ltd., Nanjing 210005, China)Abstract: The detailing and behavior of the buckling-restrained brace with gapped tendon protections(GT-BRB) were promoted and introduced. Then the stiffness property of the GT-BRB was derived in detail. The stiffness property of the GT-BRB was the combination of the BRB and the gapped tendons, resulting in the significant third stiffness under large strain amplitude. The unloading stiffness of the GT-BRB was related with the maximum strain amplitude, and the third stiffness in compression is slightly smaller than that in tension. A two-storey structure with GT-BRB was used as a numerical example, exhibiting that the GT-BRB is beneficial to reduce the effect of softening storey and improve the collapse-resistant capacity of the structure.Keywords: GT-BRB; detailing; stiffness property; third stiffness; collapse-resistant capacity*國家自然科學(xué)基金（51278105，51008077），江蘇省青藍(lán)工程。作者簡介：顧志超，碩士研究生，Email: guzhichao1989@163.com。參考文獻(xiàn)［1］CHRISTOPOULOS C, TREMBLAY R, KIM H J, et al. Self-centering energy dissipative bracing system for the seismic resistance of structures: development and validation［J］. Structural Engineering, 2008, 134 (1): 96-107.［2］MILLER D J. Development and experimental validation of self-centering bucklingrestrained braces with shape memory alloy［D］. Urbana-Champaign：University of Illinois, 2011.［3］SHAWN K, UANG C M. Reducing residual drift of buckling-restrained braced frames as a dual system［J］. Engineering Structures, 2006, 28(11): 1525-1532.［4］李銘. 間隙保護屈曲約束支撐的性能和應(yīng)用研究［D］. 南京: 東南大學(xué), 2012.［5］黃波. 高性能屈曲約束支撐低周疲勞性能及抗震需求分析［D］. 南京: 東南大學(xué), 2012.［6］CHEN Z Y, GE H B, KASAI A, et al. Simplified seismic design approach for steel portal frame piers with hysteretic dampers［J］. Earthquake Engineering & Structural Dynamics, 2007, 36(4): 541-562.［7］GB 50017—2003 鋼結(jié)構(gòu)設(shè)計規(guī)范［S］. 北京：中國計劃出版社，2003.
