基于极限平衡理论的复式钢管混凝土轴心受压承载力计算方法

Calculation method of axial compressive bearing capacity for composite-sectioned concrete filled steel tubular columns based on the limit equilibrium theory

根据极限平衡理论,将其研究成果运用到复式钢管混凝土柱轴心受压承载力的计算中,同时分析复式钢管混凝土柱轴心受压的破坏机理。通过分析复式钢管混凝土各部分的应力状态和屈服条件,建立截面的力学平衡方程,提出计算复式钢管混凝土柱轴心受压承载力的简化模型。模型中采用内钢管对其管内混凝土提供约束,外钢管对混凝土不提供约束,只承担轴心受压承载力的假定,将计算结果与文献中外方内圆钢管截面试件轴心受压承载力试验值进行对比分析,吻合较好,验证该方法的合理性和有效性,为复式钢管混凝土柱轴心受压承载力的计算和优化设计提供理论依据。

According to the limit equilibrium theory with concrete filled steel tube,the paper introduces the method for calculating the strength of the composite concrete filled steel tubes under axial compression,and failure mechanism of the composite concrete steel tubes concrete is analyzed. Mechanical equilibrium equation of section is established based on the state of stress and yield condition,and simplified model of calculating the bearing capacity is presented. Assuming that the internal tube provides lateral confinement to the core concrete,and the external tube provides the compressive strength only,the calculated results of the proposed method agree with the experimental ones reported in other paper,and then the rationality and validity of the method is validated,the theoretical basis for optimal design and calculating the bearing capacity is provided for the composite concrete filled steel tubes.