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运用弹性力学半逆解法求得复式钢管混凝土轴压柱的弹性组合刚度解析解,揭示了复式钢管混凝土轴压柱组合刚度较叠加刚度有所提高的原因。通过对解析解的参数分析发现,增大外管厚径比是提高复式钢管混凝土轴压柱组合刚度的最有效方法,提高混凝土强度等级、内管厚径比和内外管直径比次之,而增大钢管强度对组合刚度无影响。
The analytical solution of the elastic combined stiffness of the double-skin concrete-filled steel tubular column under axial compression was obtained by using the semi-inverse solution of elastic mechanics, which revealed that the combined stiffness of the double-column concrete-filled steel tubular column was higher than that of the superposed stiffness. Through the analysis of the parameters of the analytical solution, it is found that increasing the ratio of the outer diameter to the outer diameter is the most effective way to increase the stiffness of composite columns with axial compression columns. The strength ratio of concrete, the thickness ratio of the inner tube and the diameter of the inner and outer tubes are the second, Increasing the strength of the pipe has no effect on the stiffness of the combination.