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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 formula to calculate the stability of dumbbell-shaped concrete filled steel tubular columns under axial load, a three-dimensional finite element model of dumbbell-shaped concrete-filled square steel tubular columns subjected to axial compression was established by using ABAQUS. The reasonable material constitutive relation Based on the experimental verification, the influence of slenderness ratio, concrete strength, yield strength of steel and cross-section steel content on the stability coefficient of dumbbell-shaped concrete filled CFST long columns are discussed through parametric analysis. The results show that: The ratio of steel and steel has a great effect on the stability coefficient of dumbbell-shaped concrete-filled CFST long columns, but the concrete strength and the yield strength of steel have little effect. By regression analysis, the formula for calculating the stability bearing capacity of dumbbell-shaped concrete-filled CFST long columns considering the slenderness ratio and the steel content ratio is established. The results are in good agreement with the finite element analysis and experimental results.