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内配异心及多层钢管可以改善普通钢管混凝土柱的受力性能,在满足轴压承载力的同时可减小外钢管壁厚。根据极限平衡理论,推导得到内配异心及多层钢管混凝土柱的轴压承载力计算式,结果表明:轴压承载力和套箍系数呈线性关系;采用ABAQUS有限元分析软件模拟内配异心及多层钢管混凝土柱的轴压受力,根据统一理论提出内配异心及多层钢管混凝土柱承载力统一公式,并将该式计算结果和ABAQUS分析结果对比,二者吻合较好。该统一公式可以用来计算内配异心及多层钢管混凝土柱的轴压承载力。
The inner and outer tubes with different thickness and thickness can improve the stress performance of ordinary CFST columns, and can reduce the wall thickness of outer steel tubes while satisfying the bearing capacity of axial compressive strength. According to the theory of limit equilibrium, the formula for calculating the axial compressive bearing capacity of concrete filled steel tubes with eccentric and multi-storey CFST columns is deduced. The results show that the axial compressive bearing capacity has a linear relationship with the hoop coefficient. By using ABAQUS finite element analysis software, According to the unified theory, the uniform formula for the bearing capacity of the eccentric and multi-story CFST columns is proposed. The calculated results are in good agreement with the ABAQUS analysis results. The uniform formula can be used to calculate the axial compressive load capacity of the concentric and multi-story CFST columns.