外方内圆钢管混凝土轴压承载力计算方法  

Calculation Method of Axial Bearing Capacity of Concrete-filled Square Steel Tubular Columns Reinforced by Inner Circular Steel Tube

作　　者：张志权[1] 赵胜民 张玉芬[1] 吴涛[1] 

机构地区：[1]长安大学建筑工程学院,陕西西安710061 [2]陕西省第八建筑工程公司,陕西西安710068

出　　处：《建筑科学与工程学报》2009年第2期63-67,共5页Journal of Architecture and Civil Engineering

基　　金：国家自然科学基金项目(50608004);陕西省自然科学基础研究计划项目(SJ08E214)

摘　　要：考虑内外钢管对核心混凝土的双层约束作用以及钢管因环向受拉导致纵向应力降低的影响,对内圆钢管增强方钢管混凝土组合柱的核心混凝土和内外薄壁钢管的轴向极限应力分别进行了理论分析。利用双剪统一强度理论和薄壁圆筒理论计算了钢管的轴压承载力及混凝土在三向受压状态下的轴压承载力,并通过分析内圆钢管径厚比和直径的变化对组合柱轴压承载力的影响,将内圆钢管增强方钢管混凝土的承载力与试验中纯方钢管混凝土柱进行了比较。结果表明:所得组合柱的轴压承载力与文献的试验结果吻合较好;内圆钢管对方钢管混凝土柱的增强作用主要体现在有效增强对核心混凝土的约束作用,大大提高了组合柱的力学性能。With consideration of the double confinement and the decrease of longitudinal stress because of the hoop tension, the ultimate stress of the inner and outer steel tube as well as the inner concrete under axial ultimate stress state were analyzed respectively. The bearing capacity of steel tube was calculated by using the twin shear unified strength theory and the theory of thinwall cylinder, and the axial bearing capacity of concrete under three-direction compression was also got. Through analyzing that the axial bearing capacity of compound column was influenced by diameter-to-thickness ratio and diameter of inner circular steel tube, a comparison was conducted between the results of the bearing capacity of the concrete-filled square steel tubular columns and that reinforced by the inner circular steel tube. The results show that the axial bearing capacities of the compound column under axial compression agree well with the experimental results of reference. Strength contribution of the inner circular steel tube is that provides particular reinforcement for the inner concrete, so that the concrete-confined square steel tubular column reinforced by inner circular steel tube is greatly improved in mechanics behavior.

关 键 词：内圆钢管 方钢管混凝土柱 轴压 极限承载力 径厚比 

分 类 号：TU312[建筑科学—结构工程]