带耗能腋撑型钢混凝土梁转换结构抗震性能研究
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摘要
为解决转换结构抗震性能差的问题,提出带耗能腋撑钢管混凝土柱-型钢混凝土梁新型转换结构形式。对一榀1∶4普通型钢混凝土框架转换结构和带耗能腋撑型钢混凝土框架转换结构进行拟静力试验。从试件破坏形态、荷载-位移曲线、塑性铰发展、应变发展和耗能能力等方面研究带耗能腋撑型钢混凝土转换结构的抗震性能。试验结果表明:耗能腋撑有效控制了节点区梁、柱端塑性铰的发展,使塑性铰向转换梁加腋处转移;腋撑附加轴力对转换梁下部纵筋应变影响较大,对钢管柱应变影响较小;带耗能腋撑型钢混凝土转换结构较普通型钢混凝土转换结构的梁端开裂荷载提高了60%、承载力提高了6.2%、延性系数提高了57.24%、等效黏滞系数提高了10.7%,表现出良好的耗能能力,提高了结构的抗震性能。
A new type of CFST column-SRC beam transfer structure with supplemental energy dissipation haunch braces was proposed to improve the seismic behavior.Two 1∶ 4 scale SRC transfer frame specimens with and without energy dissipation haunch braces were tested under cyclic loading,and the seismic characteristics such as failure patterns,load-displacement curves,development of plastic hinges and strains,energy-dissipation capacity were compared and studied.Test results show that the haunch brace can effectively control the development of beam-column plastic hinges at the panel zone and relocate them to the haunch-transfer beam joint.Considerable effects on the strains of longitudinal reinforcing bars at the bottom of the transfer beam in mid-span and insignificant effects on the strains of the steel tube can be found by applying additional axial force through the haunch brace.Comparing with normal SRC transfer structures,the crack load at the end of the beam of the SRC transfer structure with energy dissipation haunch brace can be improved by 60%,the bearing capacity by 6.2%,the ductility coefficient by 57.24%,and the equivalent viscous coefficient by 10.7%.
A new type of CFST column-SRC beam transfer structure with supplemental energy dissipation haunch braces was proposed to improve the seismic behavior.Two 1∶ 4 scale SRC transfer frame specimens with and without energy dissipation haunch braces were tested under cyclic loading,and the seismic characteristics such as failure patterns,load-displacement curves,development of plastic hinges and strains,energy-dissipation capacity were compared and studied.Test results show that the haunch brace can effectively control the development of beam-column plastic hinges at the panel zone and relocate them to the haunch-transfer beam joint.Considerable effects on the strains of longitudinal reinforcing bars at the bottom of the transfer beam in mid-span and insignificant effects on the strains of the steel tube can be found by applying additional axial force through the haunch brace.Comparing with normal SRC transfer structures,the crack load at the end of the beam of the SRC transfer structure with energy dissipation haunch brace can be improved by 60%,the bearing capacity by 6.2%,the ductility coefficient by 57.24%,and the equivalent viscous coefficient by 10.7%.
引文
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[5]Pampanin S,Christopoulos C,Chen T H.Developmentand validation of a metallic haunch seismic retrofit solutionfor existing under-designed RC frame buildings[J].Earthquake Engineering and Structural Dynamics,2006,35(14):1739-1766
[6]Chen T H.Retrofit strategy of non-seismically designedframe systems based on a metallic haunch system[D].Canterbury:University of Canterbury,2006
[7]钟树生,祁勇,倪忠.加腋梁式框支短肢剪力墙转换结构试验研究[J].重庆建筑大学学报,2007,29(6):44-48(Zhong Shusheng,Qi Yong,Ni Zhong.Experimentalresearch on the seismic behavior of the haunched beamtransfer structure with frame-supported short-leg shearwall[J].Journal of Chongqing Jianzhu University,2007,29(6):44-48(in Chinese))
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[9]吴轶,何铭基,周云,等.带耗能腋撑型钢混凝土转换结构减震性能分析[J].工程抗震与加固改造,2010,32(2):68-74,80(Wu Yi,He Mingji,Zhou Yun,et al.Analysis of aseismic performances of SRC transfer structurewith supplemental energy dissipation haunch brace[J].Earthquake Resistant Engineering and Retrofitting,2010,32(2):68-74,80(in Chinese))
[10]吴轶,何铭基,郑俊光,等.耗能腋撑对钢筋混凝土框架抗震加固性能分析[J].广西大学学报:自然科学版,2009,34(6):725-730(Wu Yi,He Mingji,ZhengJunguang,et al.Analyses of seismic retrofittingperformances of reinforced concrete frame with energydissipation haunch braces[J].Journal of GuangxiUniversity:Natural Science Edition,2009,34(6):725-730(in Chinese))
[11]JGJ101—1996建筑抗震试验方法规程[S].北京:中国建筑工业出版社,1997(JGJ101—1996Specification oftesting methods for earthquake resistant building[S].Beijing:China Architecture&Building Press,1997(inChinese))
[12]朱伯龙.结构抗震试验[M].北京:地震出版社,1989
[2]Uang C M,Bondad D,Lee C H.Cyclic performance ofhaunch repaired steel moment connections:experimentaltesting and analytical modeling[J].EngineeringStructures,1998,20(4/5/6):552-561
[3]Uang C M,Yu Q,Noel S,et al.Cyclic testing of steelmoment connections rehabilitated with RBS or weldedhaunch[J].Journal of Structural Engineering,2000,126(1):57-68
[4]Pampanin S,Christopoulos C.Non-invasive retrofit of existingRC frames designed for gravity loads only[C]//FIB 2003Symposium‘Concrete Structures in Seismic Regions’.Athens,Greece,2003
[5]Pampanin S,Christopoulos C,Chen T H.Developmentand validation of a metallic haunch seismic retrofit solutionfor existing under-designed RC frame buildings[J].Earthquake Engineering and Structural Dynamics,2006,35(14):1739-1766
[6]Chen T H.Retrofit strategy of non-seismically designedframe systems based on a metallic haunch system[D].Canterbury:University of Canterbury,2006
[7]钟树生,祁勇,倪忠.加腋梁式框支短肢剪力墙转换结构试验研究[J].重庆建筑大学学报,2007,29(6):44-48(Zhong Shusheng,Qi Yong,Ni Zhong.Experimentalresearch on the seismic behavior of the haunched beamtransfer structure with frame-supported short-leg shearwall[J].Journal of Chongqing Jianzhu University,2007,29(6):44-48(in Chinese))
[8]蔡健,周飞,苏广群,等.带腋撑钢筋混凝土框架结构的力学性能[J].华南理工大学学报:自然科学版,2009,37(9):7-12(Cai Jian,Zhou Fei,Su Guangqun,et al.Mechanical behavior of reinforced concrete frame structurewith diagonal members[J].Journal of South ChinaUniversity of Technology:Natural Science Edition,2009,37(9):7-12(in Chinese))
[9]吴轶,何铭基,周云,等.带耗能腋撑型钢混凝土转换结构减震性能分析[J].工程抗震与加固改造,2010,32(2):68-74,80(Wu Yi,He Mingji,Zhou Yun,et al.Analysis of aseismic performances of SRC transfer structurewith supplemental energy dissipation haunch brace[J].Earthquake Resistant Engineering and Retrofitting,2010,32(2):68-74,80(in Chinese))
[10]吴轶,何铭基,郑俊光,等.耗能腋撑对钢筋混凝土框架抗震加固性能分析[J].广西大学学报:自然科学版,2009,34(6):725-730(Wu Yi,He Mingji,ZhengJunguang,et al.Analyses of seismic retrofittingperformances of reinforced concrete frame with energydissipation haunch braces[J].Journal of GuangxiUniversity:Natural Science Edition,2009,34(6):725-730(in Chinese))
[11]JGJ101—1996建筑抗震试验方法规程[S].北京:中国建筑工业出版社,1997(JGJ101—1996Specification oftesting methods for earthquake resistant building[S].Beijing:China Architecture&Building Press,1997(inChinese))
[12]朱伯龙.结构抗震试验[M].北京:地震出版社,1989
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