L形钢管混凝土框架结构抗震性能试验研究
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摘要
为了探讨L形钢管混凝土柱-钢梁框架的抗震性能,进行了4个1/2.5缩尺比例两层单跨L形钢管混凝土柱-钢梁空间框架的拟静力试验研究,主要考察了柱轴压比(n=0.4,0.6)、加载方向(β=0,°45°)对试件抗震性能的影响,对结构的破坏形态、破坏机制、滞回曲线、结构塑性铰出现的位置及次序、位移延性和耗能能力等性能进行了研究。试验结果表明:结构的破坏形态基本相同,梁端先屈曲,形成塑性铰,然后柱脚核心混凝土开裂压碎,钢管屈曲,形成塑性铰,节点核心区没有出现破坏现象,满足"强柱弱梁、强节点"的抗震设计要求;结构的滞回曲线呈饱满的梭形,强度和刚度退化不明显,变形能力和耗能能力较强;结构的延性较好,正向和反向的位移延性系数均大于4.0;轴压比对结构的抗震性能影响较大,随着轴压比的增大,框架的位移延性和耗能能力降低。
In order to study the seismic behavior of concrete-filled L-section steel tubular column-steel beam frames,four 1/2.5 reduced-scale,two-story space frame specimens with single span were tested under constant vertical load and lateral cyclic loads.Axial compression ratio of columns(n=0.4,0.6),lateral loading direction(β=0°,45°) are both considered as experimental parameters.Failure modes,failure mechanism,hysteretic curves,the region and appearance sequence of plastic hinges,displacement ductility and energy dissipation capacity of the structure specimens were studied.The test results showed that failure modes of the structure specimens were basically the same: the beam end firstly yielded,plastic hinges appeared afterwards,then core concrete of column foot cracked and crushed,and buckling happened to steel pipe.There was no failure on joint core area,which met the seismic design requirements of 'strong columns weak beams,strongger joints';the hysteretic curves of the frames exhibited plump spindle shape,the degradation of strength and stiffness was not obvious,the deformability and energy dissipation capacity of the frames were good;the displacement ductility of the structure was also well,both the forward and reverse displacement ductility coefficients were above 4.0;axial compression ratio had great influence on seismic performance of the structures,the displacement ductility and energy dissipation capacity of the frames reduced with the increase of axial compression ratio.
In order to study the seismic behavior of concrete-filled L-section steel tubular column-steel beam frames,four 1/2.5 reduced-scale,two-story space frame specimens with single span were tested under constant vertical load and lateral cyclic loads.Axial compression ratio of columns(n=0.4,0.6),lateral loading direction(β=0°,45°) are both considered as experimental parameters.Failure modes,failure mechanism,hysteretic curves,the region and appearance sequence of plastic hinges,displacement ductility and energy dissipation capacity of the structure specimens were studied.The test results showed that failure modes of the structure specimens were basically the same: the beam end firstly yielded,plastic hinges appeared afterwards,then core concrete of column foot cracked and crushed,and buckling happened to steel pipe.There was no failure on joint core area,which met the seismic design requirements of 'strong columns weak beams,strongger joints';the hysteretic curves of the frames exhibited plump spindle shape,the degradation of strength and stiffness was not obvious,the deformability and energy dissipation capacity of the frames were good;the displacement ductility of the structure was also well,both the forward and reverse displacement ductility coefficients were above 4.0;axial compression ratio had great influence on seismic performance of the structures,the displacement ductility and energy dissipation capacity of the frames reduced with the increase of axial compression ratio.
引文
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[9]黎志军,蔡健,谭哲东,陈明德.带约束拉杆异形钢管混凝土柱力学性能的试验研究[J].工程力学,2001,16(A02),124-129.(LI Zhijun,CAI Jian,TANZhedong,CHEN Mingde.Experimental research onmechanical performance of concrete-filled special-shaped steel tube columns with binding bars[J].Engineering Mechanics,2001,16(A02),124-129.(inChinese))
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[12]王丹.T形、L形钢管混凝土柱抗震性能研究[D].上海:同济大学,2005.(WANG Dan.Study on seismicbehavior of concrete filled steel tube T-section L-sectioncolumns[D].Shanghai:Tongji University,2005.(inChinese))
[2]Matsui C.Strength and behavior of frames with concretefilled square steel tubular columns under earthquakeloading[C]//Proceeding of 1st International SpecialtyConference on CFST.Harbin:Harbin Institute ofTechnology,1985:143-146.
[3]马万福.钢管混凝土单层框架动力性能的试验研究[D].哈尔滨:哈尔滨建筑大学,1998.(MA Wanfu.Experimental research on dynamic performance of singlefloor concrete-filled steel tubular frame[D].Harbin:Harbin Building University,1998.(in Chinese))
[4]张文福.单层钢管混凝上框架恢复力特性研究[D]哈尔滨:哈尔滨工业大学,2000.(ZHANG Wenfu.Research on resilience performance of single floorconcrete-filled steel tubular frame[D].Harbin:HarbinUniversity of Technology,2000.(in Chinese))
[5]李斌,薛刚,张园.钢管混凝上框架结构抗震性能试验研究[J].地震工程与工程振动,2002,22(5):53-56.(LI Bin,XUE Gang,ZHANG Yuan.Experimental study on behaviors of concrete filled steeltubular frame[J].Earthquake Engineering andEngineering Vibration,2002,22(5):53-56.(inChinese))
[6]王文达,韩林海,陶忠.钢管混凝土柱-钢梁平面框架抗震性能的试验研究[J].建筑结构学报,2006,27(3):48-58.(WANG Wenda,HAN Linhai,TAOZhong.Experimental research on seismic behavior ofconcrete-filled CHS and SHS columns and steel beamplanar frames[J].Journal of Building Structures,2006,27(3):48-58.(in Chinese))
[7]许成祥.钢管混凝上框架结构抗震性能的试验与理论研究[D].天津:天津大学,2003.(XUChengxiang.Experimental and theoretical research onseismic behavior of concrete-filled steel tubular frames[D].Tianjin:Tianjin University,2003.(inChinese))
[8]王来.方钢管混凝土框架抗震性能的试验与理论研究[D].天津:天津大学,2005.(WANG Lai.Experimental and theoretical research on seismicbehavior of concrete-filled rectangular tubular frame[D].Tianjin:Tianjin University,2005.(inChinese))
[9]黎志军,蔡健,谭哲东,陈明德.带约束拉杆异形钢管混凝土柱力学性能的试验研究[J].工程力学,2001,16(A02),124-129.(LI Zhijun,CAI Jian,TANZhedong,CHEN Mingde.Experimental research onmechanical performance of concrete-filled special-shaped steel tube columns with binding bars[J].Engineering Mechanics,2001,16(A02),124-129.(inChinese))
[10]陈之毅.矩形钢管混凝土结构施工工艺及异形柱承载力的研究[D].上海:同济大学,2003.(CHENZhiyi.Experimental research and theoretical analysisabout construction techniques of concrete-filledrectangular steel tube(CFRT)columns and axial bearingcapacity of concrete-filled special-shaped steel tube stub[D].Shanghai:Tongji University,2003.(inChinese))
[11]周海军.反复荷载作用下L形钢管混凝土柱力学性能研究[D].上海:同济大学,2005.(ZHOU Haijun.Seismic behavior of concrete-filled L-section steeltubular columns under cyclic loading[D].Shanghai:Tongji University,2005.(in Chinese))
[12]王丹.T形、L形钢管混凝土柱抗震性能研究[D].上海:同济大学,2005.(WANG Dan.Study on seismicbehavior of concrete filled steel tube T-section L-sectioncolumns[D].Shanghai:Tongji University,2005.(inChinese))
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