哑铃形截面钢管混凝土轴压中长柱稳定性研究  

Study on stability of concrete-filled dumbbell-shaped steel tubular middle long columns under axial load

作　　者：罗雅婷[1] 丁发兴[1] 龚永智[1] 余志武[1] 

机构地区：[1]中南大学土木工程学院,湖南长沙410075

出　　处：《建筑结构学报》2013年第S1期301-305,共5页Journal of Building Structures

基　　金：国家科技支撑计划项目(2011BAJ09B02);长江学者和创新团队发展计划项目(IRT1296);新世纪优秀人才支持计划项目(NCET-11-0508)

摘　　要：为建立反映更多参数影响的哑铃形截面钢管混凝土轴压中长柱稳定承载力计算式,运用ABAQUS建立哑铃形截面钢管混凝土轴压中长柱三维有限元分析模型,采用合理的材料本构关系,在试验验证的基础上,通过参数分析,探讨长细比、混凝土强度、钢材屈服强度和截面含钢率对哑铃形截面钢管混凝土轴压中长柱稳定系数的影响,分析结果表明:长细比、截面含钢率对哑铃形截面钢管混凝土轴压中长柱稳定系数影响较大,而混凝土强度和钢材屈服强度的影响不大。通过回归分析,建立考虑长细比和含钢率影响的哑铃形截面钢管混凝土轴压中长柱稳定承载力计算式,其结果与有限元分析结果和试验结果符合较好。In order to establish the calculating formula of stability capacity which can reflect the influences of more parameters of concrete-filled dumbbell-shaped steel tubular middle long columns under axial load,ABAQUS was used to establish the 3D finite element analysis model and to analyze the behavior of concrete-filled dumbbell-shaped steel tubular middle long columns under axial load.Based on the appropriate constitutive models and the experimental verification,parametric analysis was conducted to investigate the influences of the slenderness ratio,concrete strength,yield of steel strength and steel ratio on stability coefficient of concrete-filled dumbbell-shaped steel tubular middle long columns under axial load.The results show that the stability coefficient is obviously influenced by slenderness ratio and steel ratio,and hardly influenced by concrete strength and yield of steel strength.Based on regression analysis,a calculating formula of stability capacity suitable for concrete-filled dumbbell-shaped steel tubular middle long columns under axially loaded was suggested.The finite element analysis and experimental results are in good agreement.

关 键 词：圆钢管混凝土 哑铃形截面 轴压长柱 有限元分析 稳定系数 

分 类 号：TU398.9[建筑科学—结构工程]