防屈曲支撑固接节点受力性能的子系统试验
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摘要
防屈曲支撑作为一种有效的耗能减震构件在地震高烈度区的工程结构中已被广泛应用。保证防屈曲支撑节点的稳定性是其设计的关键,然而已有研究和设计方法并没有关注支撑-结构之间的相互作用对防屈曲支撑节点稳定性的影响。为此,设计一根两端固接连接的足尺防屈曲支撑试件并对其进行子系统试验,支撑采用单斜布置形式。试验结果表明,结构层间变形会引起支撑节点以及约束构件发生平面内刚体转动,导致支撑轴力作用线与节点轴线之间产生相对转角,其幅值与层间变形角相当,是导致节点弯矩产生的根源。在支撑节点截面面积为屈服段面积5倍和层间变形角为3.5%的情况下,节点根部弯曲正应力已超过100MPa,其不利影响不容忽视。最后,根据试验结果给出若干关于防屈曲支撑节点稳定性设计及研究的建议。
Buckling-restrained braces(BRBs) have been widely used in structures in seismic-prone areas as structural control members. Stability of BRB end connection is of crucial importance in the design framework of BRB damper. However, the effect of interaction between BRB and frame structures on the performance of BRB end connections has seldom been discussed. To this end, subassemblage test was conducted on one full-scale BRB specimen to investigate the in-plane flexural behavior of BRB end connections with fix-ended condition. It is found that the relative rotation between axial force and brace end would introduce end bending moment at the end of BRB connections. Its magnitude is comparable with the story drift angle. The flexural stress of BRB end connection is larger than 100 MPa even though the cross-sectional area of connection is five times that of the core yielding segment. It shows that the effect of in-plane bending moment induced by frame action on the stability of BRB connections cannot be neglected. Several design implications and future research needs for the stability design of BRB end connections are provided based on the test observation.
Buckling-restrained braces(BRBs) have been widely used in structures in seismic-prone areas as structural control members. Stability of BRB end connection is of crucial importance in the design framework of BRB damper. However, the effect of interaction between BRB and frame structures on the performance of BRB end connections has seldom been discussed. To this end, subassemblage test was conducted on one full-scale BRB specimen to investigate the in-plane flexural behavior of BRB end connections with fix-ended condition. It is found that the relative rotation between axial force and brace end would introduce end bending moment at the end of BRB connections. Its magnitude is comparable with the story drift angle. The flexural stress of BRB end connection is larger than 100 MPa even though the cross-sectional area of connection is five times that of the core yielding segment. It shows that the effect of in-plane bending moment induced by frame action on the stability of BRB connections cannot be neglected. Several design implications and future research needs for the stability design of BRB end connections are provided based on the test observation.
引文
[1]赵俊贤,吴斌.防屈曲支撑的工作机理及稳定性设计方法[J].地震工程与工程振动,2009,29(3):131-139(Zhao Junxian,Wu Bin.Working mechanism and stability design methods of buckling-restrained braces[J].Journal of Earthquake Engineering and Engineering Vibration,2009,29(3):131-139(in Chinese))
[2]Fujimoto M,Wada A,Saeki E,et al.A study on the unbonded brace encased in buckling-restraining concrete and steel tube[J].Journal of Structural and Construction Engineering,AIJ,1988,34B:249-258
[3]李国强,胡宝琳,孙飞飞,等.国产TJⅠ型屈曲约束支撑的研制与试验[J].同济大学学报:自然科学版,2011,39(5):631-636(Li Guoqiang,Hu Baolin,Sun feifei,et al.Development and experimental study on domestic TJI bucking-restrained brace[J].Journal of Tongji University:Natural Science,2011,39(5):631-636(in Chinese))
[4]周云,钱洪涛,褚洪民,等.新型防屈曲耗能支撑设计原理与性能研究[J].土木工程学报,2009,42(4):64-71(Zhou Yun,Qian Hongtao,Chu Hongmin,et al.A study on the design principle and performance of a new type of buckling-resistant brace[J].China Civil Engineering Journal,2009,42(4):64-71(in Chinese))
[5]程光煜,叶列平,许秀珍,等.防屈曲耗能钢支撑的试验研究[J].建筑结构学报,2008,29(1):31-39(Cheng Guangyu,Ye Lieping,Xu Xiuzhen,et al.Experimental researches on buckling-restrained brace[J].Journal of Building Structures,2008,29(1):31-39(in Chinese))
[6]Zhao J X,Wu B,Ou J P.A novel type of angle steel buckling-restrained brace:Cyclic behavior and failure mechanism[J].Earthquake Engineering and Structural Dynamics,2011,40(10):1083-1102
[7]赵俊贤,吴斌,欧进萍.新型全钢防屈曲支撑的拟静力滞回性能试验[J].土木工程学报,2011,44(4):60-70(Zhao Junxian,Wu Bin,Ou Jinping.Uniaxial quasi-static cyclic tests on the hysteretic behavior of a novel type of allsteel buckling-restrained brace[J].China Civil Engineering Journal,2011,44(4):60-70(in Chinese))
[8]Zhao J X,Wu B,Ou J P.Effect of brace end rotation on the global buckling behavior of pin-connected bucklingrestrained braces with end collars[J].Engineering Structures,2012,40(7):240-253
[9]Zhao J X,Wu B,Ou J P.Global stability design method of buckling-restrained braces considering end bending moment transfer:Discussion on pinned connections with collars[J].Engineering Structures,2013,49(4):947-962
[10]Zhao J X,Wu B,Ou J P.A practical and unified global stability design method of buckling-restrained braces:D i s c u s s i o n o n p i n n e d c o n n e c t i o n s[J].J o u r n a l o f Constructional Steel Research,2014,95(4):106-115
[11]Zhao J X,Wu B,Li W,et al.Local buckling behavior of steel angle core members in buckling-restrained braces:Cyclic tests,theoretical analysis,and design recommendations[J].Engineering Structures,2014,66(5):129-145
[12]Takeuchi T,Hajjar J F,Matsui R,et al.Local buckling restraint condition for core plates in buckling restrained braces[J].Journal of Constructional Steel Research,2010,66(2):139-149
[13]Zhao J X,Wu B,Ou J P.Flexural demand on pin-connected buckling-restrained braces and design recommendations[J].Journal of Structural Engineering,ASCE,2012,138(11):1398-1415
[14]赵俊贤,吴斌,李惠,等.防屈曲支撑的设计标准建议[J].土木工程学报,2013,46(S1):25-31(Zhao Junxian,Wu Bin,Li Hui,et al.Recommendations for design standards of buckling-restrained braces[J].China Civil Engineering Journal,2013,46(S1):25-31(in Chinese))
[15]Kinoshita T,Koetaka Y,Inoue K,et al.Criteria of bucklingrestrained braces to prevent out-of-plane buckling[J].Journal of Structural and Construction Engineering,AIJ,2007,621(11):141-148
[16]Tsai K C,Hsiao P C.Pseudo-dynamic test of a fullscale CFT/BRB frame—Part II:Seismic performance of buckling-restrained braces and connections[J].Earthquake Engineering and Structural Dynamics,2008,37(7):1099-1115
[17]赵俊贤.全钢防屈曲支撑的抗震性能及稳定性设计方法[D].哈尔滨:哈尔滨工业大学,2012(Zhao Junxian.Seismic behavior and stability design methods of bucklingrestrained braces[D].Harbin:Harbin Institute of Technology,2012(in Chinese))
[18]Chen Q,Li T,Wang C L,et al.Experimental evaluation on performance of all-steel BRBs[C]//Proceeding of the 12th International Symposium on Structural Engineering.Wuhan,China,2012
[19]ANSI/AISC 341-10 Seismic provisions for structural steel buildings[S].Chicago:American Institute of Steel Construction,2010林傅雄(1990–),男,硕士研究生。主要从事钢结构抗震研究。韩伟(1982–),男,硕士,工程师。主要从事结构减震及健康监测研究。陈若冰(1993–),男,本科生。主要从事钢结构抗震学习和研究。曾毅发(1992–),男,本科生。主要从事钢结构抗震学习和研究。杨曌懿(1994–),女,本科生。主要从事钢结构抗震学习和研究。卢星屹(1994–),男,本科生。主要从事钢结构抗震学习和研究。廖张迪(1993–),男,本科生。主要从事钢结构抗震学习和研究。张昱博(1993–),女,本科生。主要从事钢结构抗震学习和研究。
[2]Fujimoto M,Wada A,Saeki E,et al.A study on the unbonded brace encased in buckling-restraining concrete and steel tube[J].Journal of Structural and Construction Engineering,AIJ,1988,34B:249-258
[3]李国强,胡宝琳,孙飞飞,等.国产TJⅠ型屈曲约束支撑的研制与试验[J].同济大学学报:自然科学版,2011,39(5):631-636(Li Guoqiang,Hu Baolin,Sun feifei,et al.Development and experimental study on domestic TJI bucking-restrained brace[J].Journal of Tongji University:Natural Science,2011,39(5):631-636(in Chinese))
[4]周云,钱洪涛,褚洪民,等.新型防屈曲耗能支撑设计原理与性能研究[J].土木工程学报,2009,42(4):64-71(Zhou Yun,Qian Hongtao,Chu Hongmin,et al.A study on the design principle and performance of a new type of buckling-resistant brace[J].China Civil Engineering Journal,2009,42(4):64-71(in Chinese))
[5]程光煜,叶列平,许秀珍,等.防屈曲耗能钢支撑的试验研究[J].建筑结构学报,2008,29(1):31-39(Cheng Guangyu,Ye Lieping,Xu Xiuzhen,et al.Experimental researches on buckling-restrained brace[J].Journal of Building Structures,2008,29(1):31-39(in Chinese))
[6]Zhao J X,Wu B,Ou J P.A novel type of angle steel buckling-restrained brace:Cyclic behavior and failure mechanism[J].Earthquake Engineering and Structural Dynamics,2011,40(10):1083-1102
[7]赵俊贤,吴斌,欧进萍.新型全钢防屈曲支撑的拟静力滞回性能试验[J].土木工程学报,2011,44(4):60-70(Zhao Junxian,Wu Bin,Ou Jinping.Uniaxial quasi-static cyclic tests on the hysteretic behavior of a novel type of allsteel buckling-restrained brace[J].China Civil Engineering Journal,2011,44(4):60-70(in Chinese))
[8]Zhao J X,Wu B,Ou J P.Effect of brace end rotation on the global buckling behavior of pin-connected bucklingrestrained braces with end collars[J].Engineering Structures,2012,40(7):240-253
[9]Zhao J X,Wu B,Ou J P.Global stability design method of buckling-restrained braces considering end bending moment transfer:Discussion on pinned connections with collars[J].Engineering Structures,2013,49(4):947-962
[10]Zhao J X,Wu B,Ou J P.A practical and unified global stability design method of buckling-restrained braces:D i s c u s s i o n o n p i n n e d c o n n e c t i o n s[J].J o u r n a l o f Constructional Steel Research,2014,95(4):106-115
[11]Zhao J X,Wu B,Li W,et al.Local buckling behavior of steel angle core members in buckling-restrained braces:Cyclic tests,theoretical analysis,and design recommendations[J].Engineering Structures,2014,66(5):129-145
[12]Takeuchi T,Hajjar J F,Matsui R,et al.Local buckling restraint condition for core plates in buckling restrained braces[J].Journal of Constructional Steel Research,2010,66(2):139-149
[13]Zhao J X,Wu B,Ou J P.Flexural demand on pin-connected buckling-restrained braces and design recommendations[J].Journal of Structural Engineering,ASCE,2012,138(11):1398-1415
[14]赵俊贤,吴斌,李惠,等.防屈曲支撑的设计标准建议[J].土木工程学报,2013,46(S1):25-31(Zhao Junxian,Wu Bin,Li Hui,et al.Recommendations for design standards of buckling-restrained braces[J].China Civil Engineering Journal,2013,46(S1):25-31(in Chinese))
[15]Kinoshita T,Koetaka Y,Inoue K,et al.Criteria of bucklingrestrained braces to prevent out-of-plane buckling[J].Journal of Structural and Construction Engineering,AIJ,2007,621(11):141-148
[16]Tsai K C,Hsiao P C.Pseudo-dynamic test of a fullscale CFT/BRB frame—Part II:Seismic performance of buckling-restrained braces and connections[J].Earthquake Engineering and Structural Dynamics,2008,37(7):1099-1115
[17]赵俊贤.全钢防屈曲支撑的抗震性能及稳定性设计方法[D].哈尔滨:哈尔滨工业大学,2012(Zhao Junxian.Seismic behavior and stability design methods of bucklingrestrained braces[D].Harbin:Harbin Institute of Technology,2012(in Chinese))
[18]Chen Q,Li T,Wang C L,et al.Experimental evaluation on performance of all-steel BRBs[C]//Proceeding of the 12th International Symposium on Structural Engineering.Wuhan,China,2012
[19]ANSI/AISC 341-10 Seismic provisions for structural steel buildings[S].Chicago:American Institute of Steel Construction,2010林傅雄(1990–),男,硕士研究生。主要从事钢结构抗震研究。韩伟(1982–),男,硕士,工程师。主要从事结构减震及健康监测研究。陈若冰(1993–),男,本科生。主要从事钢结构抗震学习和研究。曾毅发(1992–),男,本科生。主要从事钢结构抗震学习和研究。杨曌懿(1994–),女,本科生。主要从事钢结构抗震学习和研究。卢星屹(1994–),男,本科生。主要从事钢结构抗震学习和研究。廖张迪(1993–),男,本科生。主要从事钢结构抗震学习和研究。张昱博(1993–),女,本科生。主要从事钢结构抗震学习和研究。
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