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在空钢管中填充混凝土可以避免或延缓钢管过早地发生局部屈曲，并有效地提高构件的延性，从而增强构件的抗震性能。本文在对圆钢管混凝土构件弯矩-曲率关系分析的基础上，分析了圆钢管混凝土压弯构件P-△滞回关系曲线，理论计算结果得到国内外大量试验结果的验证。基于理论分析模型，分析了各参数，如构件轴压比、长细比、截面含钢率和材料强度等因素对圆钢管混凝土压弯构件P-△滞回关系曲线的影响。最后，确定了圆钢管混凝土压弯构件P-△恢复力模型和延性系数的简化计算方法。“,”Filling with concrete will eliminate or delay the local bucklingof steel hollow sections, and will increase the ductility of the section significantly. Based on the mechanic model for the analysis of bending moment versus curvature, the hysteresis load versus deflection relations are analyzed in this paper. The theoretical results show good agreement with those of the tests. Influences of several parameters, such as axial compression ratio, slenderness ratio, steel ratio and strength of the materials on the hysteresis behavior of the beam-columns are analyzed. Finally, simplified calculating method for the model of restoring force and the ductility coefficient is suggested.