带暗柱混凝土等肢十字形柱轴压比限值调整系数研究  

Study on adjustment coefficient of limit value of axial compression ratio for R C equi-limb cross-shaped columns with concealed columns

作　　者：蒋智勇[1] 张新培[1] 岳利红[1] 

机构地区：[1]四川大学建筑与环境学院,四川成都610065

出　　处：《世界地震工程》2010年第2期193-200,共8页World Earthquake Engineering

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.

关 键 词：等肢十字形柱 暗柱 轴压比限值 调整系数 

分 类 号：TU202[建筑科学—建筑设计及理论] P315.96[天文地球—地震学]