带暗柱混凝土等肢十字形柱轴压比限值调整系数研究
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摘要
许多研究已表明异形柱设置暗柱后能有效提高截面延性,但目前为止对带暗柱异形柱轴压比限值的研究尚为空白,从而影响了带暗柱异形柱的工程应用。针对工程中应用十分广泛的十字形异形柱,采用全过程非线性分析方法,在C++平台上编制程序,计算了不同抗震等级、不同肢长下的带暗柱与不带暗柱钢筋混凝土等肢十字形柱,在不同纵向受力钢筋配筋率与体积配箍率下的截面曲率延性比;并根据《混凝土异形柱结构技术规程》JG J149—2006给出的不同抗震等级下的异形柱截面曲率延性比的要求,确定出带暗柱与不带暗柱的等肢十字形柱的轴压比限值,进而求出同一肢长下的带暗柱与不带暗柱的轴压比限值的比值;最后通过回归分析方法得到带暗柱等肢十字形柱轴压比限值的调整系数的2种确定方法。在实际应用中可根据《混凝土异形柱结构技术规程》中规定的不带暗柱十字形柱的轴压比限值,利用该调整系数求出带暗柱的等肢十字形柱的轴压比限值。
Lots of studies show that the ductility of cross-shaped columns can be improved with setting the concealed column in the specially-shaped columns.But how to adjust the limit value of axial compression of the specially-shaped column with concealed column hasn't mentioned,so that the engineering application of the specially-shaped column is affected.As aimed at cross-shaped specially-shaped columns in engineering application,based on the nonlinear analysis method of complete process,the cross-section curvature ductility ratio of equi-limb cross-shaped column with and without concealed column under different conditions is calculated by programming in C++ environment;according to curvature ductility ratio of each anti-seismic grade by Technical Specification for Concrete Structures with Specially Shaped Column(JGJ149-2006),the limit value of axial compression ratio of cross-shaped column with and without concealed column is calculated;then two methods determine the equation of adjustment coefficient of the limit value through regression analysis.In engineering application,according to the limit value of axial compression ratio of the equi-limb cross-shaped column without the concealed column that is given by the JGJ149-2006,then the limit value of axial compression ratio of equi-limb cross-shaped column with concealed column can be obtained by the equation of the adjustment coefficient.
Lots of studies show that the ductility of cross-shaped columns can be improved with setting the concealed column in the specially-shaped columns.But how to adjust the limit value of axial compression of the specially-shaped column with concealed column hasn't mentioned,so that the engineering application of the specially-shaped column is affected.As aimed at cross-shaped specially-shaped columns in engineering application,based on the nonlinear analysis method of complete process,the cross-section curvature ductility ratio of equi-limb cross-shaped column with and without concealed column under different conditions is calculated by programming in C++ environment;according to curvature ductility ratio of each anti-seismic grade by Technical Specification for Concrete Structures with Specially Shaped Column(JGJ149-2006),the limit value of axial compression ratio of cross-shaped column with and without concealed column is calculated;then two methods determine the equation of adjustment coefficient of the limit value through regression analysis.In engineering application,according to the limit value of axial compression ratio of the equi-limb cross-shaped column without the concealed column that is given by the JGJ149-2006,then the limit value of axial compression ratio of equi-limb cross-shaped column with concealed column can be obtained by the equation of the adjustment coefficient.
引文
[1]JGJ149-2006,混凝土异形柱结构技术规程[S].JGJ149-2006,Technical Specification for Concrete Structures with Specially Shaped Columns[S].
[2]曹万林,胡国振,周明杰,等.钢筋混凝土带暗柱十字形柱抗震性能实验研究[J].世界地震工程,1999,15(2):28-33.Cao Wanlin,Hu Guozhen,Zhou Mingjie,et al.Testing study on seismic behavior of RC crisscross-shaped column with concealed column[J].World Earthquake Engineering,1999,15(2):28-33.
[3]曹万林,胡国振,崔立长,等.钢筋混凝土带暗柱异形柱抗震性能试验及分析[J].建筑结构学报,2002,23(1):16-20.Cao Wanlin,Hu Guozhen,Cui Lichang,et al.Experiment and analysis of seismic behavior of the十,L,T-shaped columns with concealed columns[J].Joural of Building Structures,2002,23(1):16-20.
[4]Park R,Nigel P M.Ductility of square-confined concrete columns[J].J Struct Div,ASCE,1982,108(ST4):929-950.
[5]宋佳璐,张翼,张新培,等.保护层厚度对钢筋混凝土等肢异形柱延性性能的影响[J].世界地震工程,2009,25(1):131-137.Song Jialu,Zhang Yi,Zhang Xinpei,et al.Effect of concrete casing thickness on ductility of equi-limb specially shaped columns[J].World Earth-quake Engineering,2009,25(1):131-137.
[6]王依群,许贻懂,陈云霞.钢筋混凝土异形柱的轴压比限值与配箍构造[J].天津大学学报,2006,39(3):295-300.Wang Yiqun,Xu Yidong,Chen Yunxia.Limited value of axial compression ratio and detailing requirements for stirrup of special shaped RC column[J].Journal of Tianjin University,2006,39(3):295-300.
[7]许贻懂,赵艳静,陈云霞,等.不等肢异形柱延性性能及轴压比限值[C]//王依群编.混凝土异形柱结构理论及应用.北京:知识产权出版社,2006:32-41.Xu Yidong,Zhao Yanjing,Chen Yunxia,et al.Ductility and limited value of axial compression ratio of equi-limb specially shaped columns[C]//WANG Yiqun(editor).Theory and Application of Special-shaped Columns.Beijing:Intellectual Property Press,2006:32-41.
[2]曹万林,胡国振,周明杰,等.钢筋混凝土带暗柱十字形柱抗震性能实验研究[J].世界地震工程,1999,15(2):28-33.Cao Wanlin,Hu Guozhen,Zhou Mingjie,et al.Testing study on seismic behavior of RC crisscross-shaped column with concealed column[J].World Earthquake Engineering,1999,15(2):28-33.
[3]曹万林,胡国振,崔立长,等.钢筋混凝土带暗柱异形柱抗震性能试验及分析[J].建筑结构学报,2002,23(1):16-20.Cao Wanlin,Hu Guozhen,Cui Lichang,et al.Experiment and analysis of seismic behavior of the十,L,T-shaped columns with concealed columns[J].Joural of Building Structures,2002,23(1):16-20.
[4]Park R,Nigel P M.Ductility of square-confined concrete columns[J].J Struct Div,ASCE,1982,108(ST4):929-950.
[5]宋佳璐,张翼,张新培,等.保护层厚度对钢筋混凝土等肢异形柱延性性能的影响[J].世界地震工程,2009,25(1):131-137.Song Jialu,Zhang Yi,Zhang Xinpei,et al.Effect of concrete casing thickness on ductility of equi-limb specially shaped columns[J].World Earth-quake Engineering,2009,25(1):131-137.
[6]王依群,许贻懂,陈云霞.钢筋混凝土异形柱的轴压比限值与配箍构造[J].天津大学学报,2006,39(3):295-300.Wang Yiqun,Xu Yidong,Chen Yunxia.Limited value of axial compression ratio and detailing requirements for stirrup of special shaped RC column[J].Journal of Tianjin University,2006,39(3):295-300.
[7]许贻懂,赵艳静,陈云霞,等.不等肢异形柱延性性能及轴压比限值[C]//王依群编.混凝土异形柱结构理论及应用.北京:知识产权出版社,2006:32-41.Xu Yidong,Zhao Yanjing,Chen Yunxia,et al.Ductility and limited value of axial compression ratio of equi-limb specially shaped columns[C]//WANG Yiqun(editor).Theory and Application of Special-shaped Columns.Beijing:Intellectual Property Press,2006:32-41.
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