钢筋混凝土柱地震剪切-粘结破坏试验研究
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摘要
剪切-粘结破坏是钢筋混凝土结构的一种重要震害形式,为研究剪跨比在1.5―2.5之间钢筋混凝土柱的抗震性能,进行了16个试件的拟静力试验,对其破坏形态、延性及耗能能力、刚度退化、抗剪承载力等进行了对比分析。结果表明,试件以剪切及粘结破坏为主,可分为弯剪、剪切和粘结破坏三种类型,弯剪破坏试件表现出较好的延性和耗能能力,而粘结破坏试件滞回曲线表现出明显的"捏拢"效应,延性及耗能能力差、刚度退化快,为脆性破坏,易发生于剪跨比λ在1.5―2.0,受拉纵筋配筋率≥1.0%且混凝土强度较低的框架短柱中,宜在抗震设计中引起重视。
Shear-bond failure is an important failure mode for reinforced concrete(RC) structures subjected to seismic actions.The quasi-static test for 16 specimens with the aspect ratio between 1.5―2.5 was conducted to study the aseismic performance of RC columns.The failure patterns,ductility and dissipated energy parameters,degradation of stiffness and shear strength of the specimens are studied.The test results indicate that the specimens were dominated by shear and bond failure,including flexural-shear,shear and bond failure modes.The specimens with flexural-shear failure show good ductility and energy dissipating capacity,while the specimens with bond failure have clearly "pinching effect",poor ductility and energy dissipating capacity and faster stiffness degradation,which leads to a non-ductile behavior of the specimens.Also,short columns with aspect ratios between 1.5―2.0,tensile longitudinal reinforcement ratios exceed 1.0% and low concrete strength were vulnerable to bond failure,on which more attention should be paid in aseismic design.
Shear-bond failure is an important failure mode for reinforced concrete(RC) structures subjected to seismic actions.The quasi-static test for 16 specimens with the aspect ratio between 1.5―2.5 was conducted to study the aseismic performance of RC columns.The failure patterns,ductility and dissipated energy parameters,degradation of stiffness and shear strength of the specimens are studied.The test results indicate that the specimens were dominated by shear and bond failure,including flexural-shear,shear and bond failure modes.The specimens with flexural-shear failure show good ductility and energy dissipating capacity,while the specimens with bond failure have clearly "pinching effect",poor ductility and energy dissipating capacity and faster stiffness degradation,which leads to a non-ductile behavior of the specimens.Also,short columns with aspect ratios between 1.5―2.0,tensile longitudinal reinforcement ratios exceed 1.0% and low concrete strength were vulnerable to bond failure,on which more attention should be paid in aseismic design.
引文
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[12]压弯剪构件抗震性能专题研究组.钢筋砼压弯剪构件抗震性能试验研究[J].建筑结构学报,1992,13(2):2―10.Research group on seismic behavior of memberssubjected to axial load,bending and shear.Experimentalresearch on seismic behavior of reinforced concretemember subjected to axial load,bending and shear[J].Journal of Building Structures,1992,13(2):2―10.(inChinese)
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[16]Bayrak O,Sheikh S A.Confinement reinforcementdesign considerations for ductile HSC columns[J].Journal of Structural Engineering,ASCE,1998,124(9):999―1010.
[17]ACI Committee 318.Building code requirements forstructural concrete and commentary(ACI 318M-05)[S].American Concrete Institute,Farmington Hills,MI,2005.
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[19]孙治国,司炳君,王东升,郭迅,于德海.高强箍筋高强混凝土柱抗震性能研究[J].工程力学,2010,27(5):128―136.Sun Zhiguo,Si Bingjun,Wang Dongsheng,Guo Xun,YuDehai.Research on the seismic performance ofhigh-strength concrete columns with high-strengthstirrups[J].Engineering Mechanics,2010,27(5):128―136.(in Chinese)
[20]张先进,陈家夔.在高轴压和循环剪力作用下钢筋混凝土框架短柱的抗剪性能[J].西南交通大学学报,1989,24(1):60―67.Zhang Xianjin,Chen Jiakui.Shear behavior of reinforcedconcrete short columns subjected to high axial and cycliclateral loads[J].Journal of Southwest JiaotongUniversity,1989,24(1):60―67.(in Chinese)
[21]李力,陈家夔.R.C.框架短柱的粘结开裂破坏强度[J].西南交通大学学报,1989,24(3):42―48.Li Li,Chen Jiakui.Bond-failure strength of reinforcedconcrete short columns[J].Journal of SouthwestJiaotong University,1989,24(3):42―48.(in Chinese)
[2]孙治国,王东升,李宏男,郭迅,司炳君,王清湘.汶川地震钢筋混凝土框架震害及震后修复建议[J].自然灾害学报,2010,19(4):114―123.Sun Zhiguo,Wang Dongsheng,Li Hongnan,Guo Xun,Si Bingjun,Wang Qingxiang.Damage investigation ofthe RC frames in Wenchuan earthquake and suggestionsfor repair and strengthening[J].Journal of NaturalDisasters,2010,19(4):114―123.(in Chinese)
[3]温增平,徐超,陆鸣.汶川地震重灾区典型钢筋混凝土框架结构震害现象[J].北京工业大学学报,2009,35(6):753―760.Wen Zengping,Xu Chao,Lu Ming.Damage features ofRC frame structures in Wenchuan earthquake[J].Journalof Beijing University of Technology,2009,35(6):753―760.(in Chinese)
[4]庄卫林,刘振宇,蒋劲松.汶川大地震公路桥梁震害分析及对策[J].岩石力学与工程学报,2009,28(7):1377―1387.Zhuang Weilin,Liu Zhenyu,Jiang Jinsong.Earthquake-induced damage analysis of highway bridges inWenchuan earthquake and countermeasures[J].ChineseJournal of Rock Mechanics and Engineering,2009,28(7):1377―1387.(in Chinese)
[5]Zhao B,Tancer F,Rossetto T.Field investigation on theperformance of buildings during the 12 may 2008Wenchuan earthquake in China[J].EngineeringStructures,2009,31(8):1707―1723.
[6]Ichinose T.Splitting bond failure of columns underseismic action[J].ACI Structural Journal,1995,92(5):1―8.
[7]Papazoglou A J,Elnashai A S.Analytical and fieldevidence of the damaging effect of vertical earthquakeground motion[J].Earthquake Engineering andStructural Dynamics,1996,25(10):1109―1137.
[8]Kitagawa Y,Hiraishi H.Overview of the 1995 Hyogo-ken Nanbu earthquake and proposals for earthquakemitigation measures[J].Journal of Japan Association forEarthquake Engineering,2004,4(3):1―29.
[9]Sasani M.Life-safety and near-collapse capacity modelsfor seismic shear behavior of reinforced concretecolumns[J].ACI Structural Journal,2007,104(1):30―38.
[10]赵国藩.高等钢筋混凝土结构学[M].北京:中国电力工业出版社,1999.Zhao Guofan.Advanced reinforced concrete structures[M].Beijing:China Electric Press,1999.(in Chinese)
[11]Ohue M,Morimoto H,Fujii S.The behavior of RC shortcolumns failing in splitting bond-shear under dynamiclateral loading[J].Transactions of the Japan ConcreteInstitute,1985(7):293―300.
[12]压弯剪构件抗震性能专题研究组.钢筋砼压弯剪构件抗震性能试验研究[J].建筑结构学报,1992,13(2):2―10.Research group on seismic behavior of memberssubjected to axial load,bending and shear.Experimentalresearch on seismic behavior of reinforced concretemember subjected to axial load,bending and shear[J].Journal of Building Structures,1992,13(2):2―10.(inChinese)
[13]陈家夔.钢筋混凝土框架柱的抗震性能[J].西南交通大学学报,1990,25(2):23―32.Chen Jiakui.Seismic behavior of columns in reinforcedconcrete frames[J].Journal of Southwest JiaotongUniversity,1990,25(2):23―32.(in Chinese)
[14]徐贱云,吴健生,铃木计夫.多次循环荷载作用下钢筋混凝土柱的性能[J].土木工程学报,1991,24(3):57―70.Xu Jianyun,Wu Jiansheng,Kazuo Suzuki.Behaviour ofreinforced concrete columns under cyclic lateral load[J].China Civil Engineering Journal,1991,24(3):57―70.(in Chinese)
[15]姜维山,白国良.配复合箍、螺旋箍、X形筋钢筋砼短柱的抗震性能及抗震设计[J].建筑结构学报,1994,15(1):2―16.Jiang Weishan,Bai Guoliang.Seismic behavior andstructural design of RC stub columns with tied stirrups,spiral stirrups and X-shape bars[J].Journal of BuildingStructures,1994,15(1):2―16.(in Chinese)
[16]Bayrak O,Sheikh S A.Confinement reinforcementdesign considerations for ductile HSC columns[J].Journal of Structural Engineering,ASCE,1998,124(9):999―1010.
[17]ACI Committee 318.Building code requirements forstructural concrete and commentary(ACI 318M-05)[S].American Concrete Institute,Farmington Hills,MI,2005.
[18]GB 50010-2002,混凝土结构设计规范[S].2002.GB 50010-2002,Code for design of concrete structures[S].2002.(in Chinese)
[19]孙治国,司炳君,王东升,郭迅,于德海.高强箍筋高强混凝土柱抗震性能研究[J].工程力学,2010,27(5):128―136.Sun Zhiguo,Si Bingjun,Wang Dongsheng,Guo Xun,YuDehai.Research on the seismic performance ofhigh-strength concrete columns with high-strengthstirrups[J].Engineering Mechanics,2010,27(5):128―136.(in Chinese)
[20]张先进,陈家夔.在高轴压和循环剪力作用下钢筋混凝土框架短柱的抗剪性能[J].西南交通大学学报,1989,24(1):60―67.Zhang Xianjin,Chen Jiakui.Shear behavior of reinforcedconcrete short columns subjected to high axial and cycliclateral loads[J].Journal of Southwest JiaotongUniversity,1989,24(1):60―67.(in Chinese)
[21]李力,陈家夔.R.C.框架短柱的粘结开裂破坏强度[J].西南交通大学学报,1989,24(3):42―48.Li Li,Chen Jiakui.Bond-failure strength of reinforcedconcrete short columns[J].Journal of SouthwestJiaotong University,1989,24(3):42―48.(in Chinese)
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