根据实验获得核心混凝土的应力应变关系及国产建筑钢材弹塑性阶段的切线模量计算公式,从而提出按切线模量理论确定钢管混凝土轴压构件的稳定承载力.它和钢号、混凝土标号及含钢率等因素有关.同时还导出了强度稳定的界限长细比及考虑紧箍力影响的最大长细比λ_o及λ_p.根据推荐的计算公式作出了稳定系数ρ曲线.经和大和量的实验结果相比,证明了推荐公式的正确性,可供设计时使用. The stress-strain relationship of the core concrete and the calculation formula of the tangent modulus of the domestic steel during the elasto-plastic phase were obtained according to the experiment, and the stability bearing capacity of the concrete filled steel tube axial members was determined according to the tangential modulus theory. Factors such as steel rate are also relevant. At the same time, the ratio of strength to stability and the maximum slenderness ratio, λ_o and λ_p, are taken into account. The stability coefficient ρ curve, the sum of the sum and the sum, and the sum of the values ​​are given according to the recommended formula. Compared with the results, the correctness of the recommended formula is proved and it can be used when designing.