带约束拉杆方形钢管混凝土短柱偏压工作机理
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摘要
为研究带约束拉杆方形钢管混凝土短柱偏压的工作机理,采用考虑材料泊松比变化、钢管和核心混凝土界面作用及钢管残余应力的有限元模型,利用有限元软件ABAQUS对其偏压受力全过程进行分析.从横向变形、荷载-竖向位移曲线、核心混凝土纵向应力分布、钢管与核心混凝土的相互作用、约束拉杆的影响等方面讨论了带约束拉杆方形钢管混凝土短柱偏压工作机理.结果表明:有限元计算结果与试验结果吻合较好;设置约束拉杆可减小构件的横向挠曲变形,改变截面的变形模态,增强钢管对核心混凝土的约束效应,提高短柱的偏压承载力和延性;约束拉杆间距越小,短柱的延性越好,偏压承载力越大;泊松比对短柱偏压承载力具有一定影响,残余应力则对其几乎无影响.
To investigate the eccentric compressive mechanism of the square concrete-filled steel tubular( CFT) columns with binding bars,the finite element softw are ABAQUS is adopted to analyze the eccentric compressive progress of the square CFT columns. The effects of the Poisson's ratio,the interaction betw een steel tube and core concrete,and the residual stress of the steel tube are considered in this finite element model. The mechanism of the square CFT columns with binding bars is discussed in consideration of the lateral deflection,the relationship of the load and the vertical displacement,the longitudinal stress distribution of core concrete,the interaction betw een steel tube and core concrete,and the effect of the spacing of binding bars. The results show that the calculation results of the finite element model are in agreement with the experimental results. The binding bars can confine the transverse deformation of steel tube,change the deformation mode of the cross section,improve the core concrete confinement from the steel tube,and increase the bearing capacity and the ductility of the columns. With the decrease of the spacing betw een binding bars,the peak load and the ductility increase. The Poisson's ratio has some influence on the peak load,while the residual stress of the steel tube has almost no any impact.
To investigate the eccentric compressive mechanism of the square concrete-filled steel tubular( CFT) columns with binding bars,the finite element softw are ABAQUS is adopted to analyze the eccentric compressive progress of the square CFT columns. The effects of the Poisson's ratio,the interaction betw een steel tube and core concrete,and the residual stress of the steel tube are considered in this finite element model. The mechanism of the square CFT columns with binding bars is discussed in consideration of the lateral deflection,the relationship of the load and the vertical displacement,the longitudinal stress distribution of core concrete,the interaction betw een steel tube and core concrete,and the effect of the spacing of binding bars. The results show that the calculation results of the finite element model are in agreement with the experimental results. The binding bars can confine the transverse deformation of steel tube,change the deformation mode of the cross section,improve the core concrete confinement from the steel tube,and increase the bearing capacity and the ductility of the columns. With the decrease of the spacing betw een binding bars,the peak load and the ductility increase. The Poisson's ratio has some influence on the peak load,while the residual stress of the steel tube has almost no any impact.
引文
[1]余勇,吕西林.方钢管混凝土柱的三维非线性分析[J].地震工程与工程震动,1999,19(1):57-64.Yu Yong,LüXilin.3D nonlinear analysis for concretefilled rectangular tube columns[J].Earthquake Engineering and Engineering Vibration,1999,19(1):57-64.(in Chinese)
[2]黄宏,陈梦成,万城勇.带肋方钢管混凝土柱偏心受压力学性能研究[J].土木工程学报,2011,44(10):26-34.Huang Hong,Chen M engcheng,Wan Chenyong.Behavior of concrete-filled stiffened square steel tubes subjected to eccentric compressive load[J].China Civil Engineering Journal,2011,44(10):26-34.(in Chinese)
[3]Yang Y F,Han L H.Behaviour of concrete filled steel tubular(CFST)stub columns under eccentric partial compression[J].Thin-Walled Structures,2011,49(2):379-395.
[4]Ding F X,Fang C J,Bai Y,et al.Mechanical performance of stirrup-confined concrete-filled steel tubular stub columns under axial loading[J].Journal of Constructional Steel Research,2014,98:146-157.
[5]Hernández-Figueirido D,Romero M L,Bonet J L,et al.Ultimate capacity of rectangular concrete-filled steel tubular columns under unequal load eccentricities[J].Journal of Constructional Steel Research,2012,68(1):107-117.
[6]Cai J,He Z Q.Axial load behavior of square CFT stub column with binding bars[J].Journal of Constructional Steel Research,2006,62(5):472-483.
[7]何振强,蔡健.带约束拉杆方形钢管混凝土偏压短柱的试验研究[J].华南理工大学学报:自然科学版,2006,34(2):107-111.He Zhenqiang,Cai Jian.Experimental investigation into square CFT stub columns with binding bars under eccentric loads[J].Journal of South China University of Technology:Natural Science,2006,34(2):107-111.(in Chinese)
[8]蔡健,何振强.带约束拉杆方形钢管混凝土的本构关系[J].工程力学,2006,23(10):145-150.Cai Jian,He Zhenqiang.Constitutive relationship of square CFT with binding bars[J].Engineering Mechanics,2006,23(10):145-150.(in Chinese)
[9]蔡健,龙跃凌.带约束拉杆方形、矩形钢管混凝土短柱的轴压承载力[J].建筑结构学报,2009,30(1):7-14.Cai Jian,Long Yueling.Axial bearing capacity of square and rectangular CFT stub columns with binding bars[J].Journal of Building Structures,2009,30(1):7-14.(in Chinese)
[10]刘鸿亮,蔡健.带约束拉杆方形钢管混凝土轴压短柱的工作机理[J].华南理工大学学报:自然科学版,2013,41(10):117-125.Liu Hongliang,Cai Jian.M echanical behavior of square CFT stub columns with binding bars[J].Journal of South China University of Technology:Natural Science Edition,2013,41(10):117-125.(in Chinese)
[11]韩林海.钢管混凝土结构:理论与实践[M].2版.北京:科学出版社,2007:69-70.
[12]Uy B.Local and post-local buckling of concrete filled steel welded box columns[J].Journal of Constructional Steel Research,1998,47(1):47-72.
[2]黄宏,陈梦成,万城勇.带肋方钢管混凝土柱偏心受压力学性能研究[J].土木工程学报,2011,44(10):26-34.Huang Hong,Chen M engcheng,Wan Chenyong.Behavior of concrete-filled stiffened square steel tubes subjected to eccentric compressive load[J].China Civil Engineering Journal,2011,44(10):26-34.(in Chinese)
[3]Yang Y F,Han L H.Behaviour of concrete filled steel tubular(CFST)stub columns under eccentric partial compression[J].Thin-Walled Structures,2011,49(2):379-395.
[4]Ding F X,Fang C J,Bai Y,et al.Mechanical performance of stirrup-confined concrete-filled steel tubular stub columns under axial loading[J].Journal of Constructional Steel Research,2014,98:146-157.
[5]Hernández-Figueirido D,Romero M L,Bonet J L,et al.Ultimate capacity of rectangular concrete-filled steel tubular columns under unequal load eccentricities[J].Journal of Constructional Steel Research,2012,68(1):107-117.
[6]Cai J,He Z Q.Axial load behavior of square CFT stub column with binding bars[J].Journal of Constructional Steel Research,2006,62(5):472-483.
[7]何振强,蔡健.带约束拉杆方形钢管混凝土偏压短柱的试验研究[J].华南理工大学学报:自然科学版,2006,34(2):107-111.He Zhenqiang,Cai Jian.Experimental investigation into square CFT stub columns with binding bars under eccentric loads[J].Journal of South China University of Technology:Natural Science,2006,34(2):107-111.(in Chinese)
[8]蔡健,何振强.带约束拉杆方形钢管混凝土的本构关系[J].工程力学,2006,23(10):145-150.Cai Jian,He Zhenqiang.Constitutive relationship of square CFT with binding bars[J].Engineering Mechanics,2006,23(10):145-150.(in Chinese)
[9]蔡健,龙跃凌.带约束拉杆方形、矩形钢管混凝土短柱的轴压承载力[J].建筑结构学报,2009,30(1):7-14.Cai Jian,Long Yueling.Axial bearing capacity of square and rectangular CFT stub columns with binding bars[J].Journal of Building Structures,2009,30(1):7-14.(in Chinese)
[10]刘鸿亮,蔡健.带约束拉杆方形钢管混凝土轴压短柱的工作机理[J].华南理工大学学报:自然科学版,2013,41(10):117-125.Liu Hongliang,Cai Jian.M echanical behavior of square CFT stub columns with binding bars[J].Journal of South China University of Technology:Natural Science Edition,2013,41(10):117-125.(in Chinese)
[11]韩林海.钢管混凝土结构:理论与实践[M].2版.北京:科学出版社,2007:69-70.
[12]Uy B.Local and post-local buckling of concrete filled steel welded box columns[J].Journal of Constructional Steel Research,1998,47(1):47-72.
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