基于统一强度理论的圆钢管型钢再生混凝土短柱轴压承载力分析
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摘要
对9根圆钢管型钢再生混凝土短柱进行了轴心受压试验,主要考虑了再生粗骨料取代率、径厚比、型钢配钢率对试件轴压承载力的影响。试验结果表明:试件轴压承载力随着取代率的增加而逐渐减小,随径厚比的减小和型钢配钢率的增大而增大,说明该柱具有较高的承载力和良好的延性变形能力。在试验研究基础上,采用统一强度理论对圆钢管型钢再生混凝土短柱轴压极限承载力进行了理论分析;采用厚壁圆筒统一强度理论计算了钢管对核心型钢再生混凝土的约束应力;推导了该短柱的轴压承载力计算公式,并对其影响因素进行了分析。结果表明:计算值与试验值之比的均值和方差分别为0.99和0.001,吻合较好,表明统一强度理论对圆钢管型钢再生混凝土轴压短柱的理论计算有很好的适用性;此外,当材料的拉压比α(α=1时,拉压同性材料;α≠1时,拉压异性材料)一定时,试件轴压承载力随着材料强度参数b(0≤b≤1)的增大而增大;当材料强度参数b值一定且α≠1时,试件轴压承载力随着α的增大而增大;此外,试件轴压承载力随着径厚比的增加而呈递减趋势;试件承载力提高系数随着再生混凝土强度的增大而减小。研究结论可为圆钢管型钢再生混凝土组合短柱的设计与计算提供理论参考。
In this paper, the axial compression tests of nine recycled concrete filled circular steel tube-profile steel short columns are carried out. The recycled coarse aggregate replacement percentage, diameter to thickness ratio of steel tube, and steel reinforced ratio are regarded as major variable parameters. Obtained results show that the axial bearing capacity of specimens decreases as the increase of recycled coarse aggregate replacement percentage and the axial bearing capacity of specimen increases with the decrease of diameter to thickness ratio and steel ratio. The columns have good bearing capacity and deformability. Based on the experimental study, the ultimate bearing capacity of recycled concrete filled circular steel tube-profile steel short columns is analyzed by using the unified strength theory. The uniform strength theory of thick wall cylinder is used to calculate the restraint stress of steel tube to the core recycled concrete and steel. The bearing capacity formula of columns is deduced, and the influence factors are analyzed. The results indicate that the calculated values are in good agreement with the experimental values, which shows that the unified strength theory is suitable for the theoretical calculation of recycled concrete filled circular steel tube-profile steel short columns. In addition, the axial compressive bearing capacity increases with the increase of the material strength b(0≤b≤1) when the strength-differential effect α(when the value of α is one, it indicates that the material is tensile and compressive isotropic, when the value of α is not equal to one, it indicates that the material is tensile and compressive anisotropic) is fixed. The axial bearing capacity of specimens decreases with the increase of value α, when the value of b is given fixed the value of α is not equal to one. With the increase of the diameter to thickness ratio, the bearing columns show a decreasing trend. The increasing coefficient of bearing capacity of specimens decreases with the increase of the strength of recycled concrete. The conclusions can be a reference to the design and calculation of recycled concrete filled circular steel tube-profile steel short columns.
In this paper, the axial compression tests of nine recycled concrete filled circular steel tube-profile steel short columns are carried out. The recycled coarse aggregate replacement percentage, diameter to thickness ratio of steel tube, and steel reinforced ratio are regarded as major variable parameters. Obtained results show that the axial bearing capacity of specimens decreases as the increase of recycled coarse aggregate replacement percentage and the axial bearing capacity of specimen increases with the decrease of diameter to thickness ratio and steel ratio. The columns have good bearing capacity and deformability. Based on the experimental study, the ultimate bearing capacity of recycled concrete filled circular steel tube-profile steel short columns is analyzed by using the unified strength theory. The uniform strength theory of thick wall cylinder is used to calculate the restraint stress of steel tube to the core recycled concrete and steel. The bearing capacity formula of columns is deduced, and the influence factors are analyzed. The results indicate that the calculated values are in good agreement with the experimental values, which shows that the unified strength theory is suitable for the theoretical calculation of recycled concrete filled circular steel tube-profile steel short columns. In addition, the axial compressive bearing capacity increases with the increase of the material strength b(0≤b≤1) when the strength-differential effect α(when the value of α is one, it indicates that the material is tensile and compressive isotropic, when the value of α is not equal to one, it indicates that the material is tensile and compressive anisotropic) is fixed. The axial bearing capacity of specimens decreases with the increase of value α, when the value of b is given fixed the value of α is not equal to one. With the increase of the diameter to thickness ratio, the bearing columns show a decreasing trend. The increasing coefficient of bearing capacity of specimens decreases with the increase of the strength of recycled concrete. The conclusions can be a reference to the design and calculation of recycled concrete filled circular steel tube-profile steel short columns.
引文
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[3]马辉,薛建阳,王振山.型钢再生混凝土组合柱滞回特性与耗能能力分析[J].地震工程与工程振动,2014,34(6):198-206.(MA Hui,XUE Jianyang,WANG Zhenshan.Analysis of hysteresis characteristics and energy dissipation capacity of steel reinforced recycled concrete columns[J].Earthquake engineering and engineering dynamics,2014,34(6):198-206(in Chinese)).
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[5]徐金俊,姚侃,陈宗平,等.钢管再生混凝土柱轴压性能试验研究[J].建筑结构学报,2012,35(2):127-129.(XU Jinjun,YAO Kan,CHEN Zongping,et al.Experimental study on axial compression performance of recycled concrete filled steel tubular columns[J].Journal of building structures,2012,35(2):127-129(in Chinese)).
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[7]刘朝,赵均海,王娟,等.圆钢管约束型钢混凝土短柱轴压承载力分析[J].工业建筑,2012,42(12):109-119.(LIU Zhao,ZHAO Junhai,WANG Juan,et al.Bearing capacity analysis of axially compressed circular tubed steel reinforced concrete short columns[J].Journal of industrial architecture,2012,42(12):109-119(in Chinese)).
[8]蔡绍怀.现代钢管混凝土结构[M].北京:人民交通出版社,2003.(CAI Shaohuai.Modern concrete filled steel tube structure[M].Beijing:People's Communications Press,2003(in Chinese)).
[9]刘界鹏,张小冬,张素梅.圆钢管约束钢骨高强混凝土短柱轴压力学性能[J].建筑结构学报,2009(S2):242-248.(LIU Jiepeng,ZHANG Xiaodong,ZHANG Sumei.Behavior of axially compressed circular tubed steel reinforced concrete(CTSRC)stubs columns[J].Journal of building structures,2009(S2):242-248(in Chinese)).
[10]赵均海.强度理论及其工程应用[M].北京:科学出版社,2003.(ZHAO Junhai.Strength theory and its engineering application[M].Beijing:Science Press,2003(in Chinese)).
[11]赵均海,顾强,马淑芳.基于双剪统一强度理论的轴心受压钢管混凝土承载力的研究[J].工程力学,2002,19(2):33-35.(ZHAO Junhai,GU Qiang,MA Shufang.Research on bearing capacity of axially compressed concrete filled steel tube based on twin shear unified strength theory[J].Engineering mechanics,2002,19(2):33-35(in Chinese)).
[12]蔡绍怀,焦占拴.钢管混凝土短柱的基本性能和强度计算[J].建筑结构学报,1984,5(6):13-29.(CAI Shaohuai,JIAO Zhanshuan.Behavior and ultimate strength of short concrete-filled steel tubular columns[J].Journal of building structures,1984,5(6):13-29(in Chinese)).
[13]马淑芳,赵均海,魏雪英.双剪统一强度理论下钢管混凝土承载力的理论分析及试验研究[J].西安建筑科技大学学报,2007,39(2):206-212.(MA Shufang,ZHAO Junhai,WEI Xueying.Theoretical analysis and experimental study on bearing capacity of concrete filled steel tube under the unified strength theory[J].Journal of Xi'an university of architecture and technology,2007,39(2):206-212(in Chinese)).
[2]肖建庄,李佳彬,孙振平,等.再生混凝土抗压强度研究[J].同济大学学报,2004,32(12):1559-1561.(XIAO Jianzhuang,LI Jiabin,SUN Zhenping,et al.Recycled concrete compressive strength[J].Journal of Tongji university,2004,32(12):1559-1561(in Chinese)).
[3]马辉,薛建阳,王振山.型钢再生混凝土组合柱滞回特性与耗能能力分析[J].地震工程与工程振动,2014,34(6):198-206.(MA Hui,XUE Jianyang,WANG Zhenshan.Analysis of hysteresis characteristics and energy dissipation capacity of steel reinforced recycled concrete columns[J].Earthquake engineering and engineering dynamics,2014,34(6):198-206(in Chinese)).
[4]薛建阳,崔卫光,陈宗平,等.型钢再生混凝土组合柱轴压性能试验研究[J].建筑结构,2013,30(6):73-76.(XUE Jianyang,CUI Weiguang,CHEN Zongping,et al.Experimental study on axial compression performance of recycled concrete composite columns[J].Journal of building structures,2013,30(6):73-76(in Chinese)).
[5]徐金俊,姚侃,陈宗平,等.钢管再生混凝土柱轴压性能试验研究[J].建筑结构学报,2012,35(2):127-129.(XU Jinjun,YAO Kan,CHEN Zongping,et al.Experimental study on axial compression performance of recycled concrete filled steel tubular columns[J].Journal of building structures,2012,35(2):127-129(in Chinese)).
[6]俞茂宏.强度理论新体系:理论、发展和应用[M].西安:西安交通大学出版社,2011.(YU Maohong.New system of strength theory:theory,development and application[M].Xi'an:Publishing House of Xi'an Jiaotong University,2011(in Chinese)).
[7]刘朝,赵均海,王娟,等.圆钢管约束型钢混凝土短柱轴压承载力分析[J].工业建筑,2012,42(12):109-119.(LIU Zhao,ZHAO Junhai,WANG Juan,et al.Bearing capacity analysis of axially compressed circular tubed steel reinforced concrete short columns[J].Journal of industrial architecture,2012,42(12):109-119(in Chinese)).
[8]蔡绍怀.现代钢管混凝土结构[M].北京:人民交通出版社,2003.(CAI Shaohuai.Modern concrete filled steel tube structure[M].Beijing:People's Communications Press,2003(in Chinese)).
[9]刘界鹏,张小冬,张素梅.圆钢管约束钢骨高强混凝土短柱轴压力学性能[J].建筑结构学报,2009(S2):242-248.(LIU Jiepeng,ZHANG Xiaodong,ZHANG Sumei.Behavior of axially compressed circular tubed steel reinforced concrete(CTSRC)stubs columns[J].Journal of building structures,2009(S2):242-248(in Chinese)).
[10]赵均海.强度理论及其工程应用[M].北京:科学出版社,2003.(ZHAO Junhai.Strength theory and its engineering application[M].Beijing:Science Press,2003(in Chinese)).
[11]赵均海,顾强,马淑芳.基于双剪统一强度理论的轴心受压钢管混凝土承载力的研究[J].工程力学,2002,19(2):33-35.(ZHAO Junhai,GU Qiang,MA Shufang.Research on bearing capacity of axially compressed concrete filled steel tube based on twin shear unified strength theory[J].Engineering mechanics,2002,19(2):33-35(in Chinese)).
[12]蔡绍怀,焦占拴.钢管混凝土短柱的基本性能和强度计算[J].建筑结构学报,1984,5(6):13-29.(CAI Shaohuai,JIAO Zhanshuan.Behavior and ultimate strength of short concrete-filled steel tubular columns[J].Journal of building structures,1984,5(6):13-29(in Chinese)).
[13]马淑芳,赵均海,魏雪英.双剪统一强度理论下钢管混凝土承载力的理论分析及试验研究[J].西安建筑科技大学学报,2007,39(2):206-212.(MA Shufang,ZHAO Junhai,WEI Xueying.Theoretical analysis and experimental study on bearing capacity of concrete filled steel tube under the unified strength theory[J].Journal of Xi'an university of architecture and technology,2007,39(2):206-212(in Chinese)).