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根据考虑强化的弹塑性钢材本构关系和约束核心混凝土本构关系,对圆形截面钢管混凝土构件进行截面划分,采用条带法计算了圆形截面钢管混凝土构件的弯矩-曲率关系曲线,分析结果表明,截面中性轴位置主要和套箍系数有关,通过对不同参数试件的分析计算,拟合得出截面中性轴位置的计算方法;对极限状态下钢管和混凝土的应力分布进行简化,基于截面内力平衡理论推导出圆钢管混凝土构件的抗弯承载力计算公式,并与试验结果进行对比,公式计算结果和试验结果吻合较好,计算结果总体上偏于安全,该公式可以有效计算圆钢管混凝土构件的抗弯承载力.“,”According to considering strengthening elastoplastic constitutive relationship of steel and the constitutive relationship of in-core concrete considering confining effect, the moment-curvature curves of concrete filled circular steel tube (CFCST) subjected to bending load are acquired by the strip method. The analysis results show that the neutral axis position of cross-section is mainly related to the confinement index. Through the analysis of the specimen with different parameters, the method for calculating the position of neutral axis is obtained by fitting. Based on the ultimate-state equilibrium and to simplify stress distribution of concrete and steel, the theory formulas on calculating moment bearing capacity of CFCST are derived; and then the results are compared with test data. The calculation results are safe on the whole, showing that the equation could effectively estimate the bearing capacity of CFCST subjected to bending load.