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构件截面非线性分析是进行结构抗震性能分析的重要基础,针对方钢管混凝土构件中钢管的三向受力特点,提出了一种适于计算方钢管混凝土压弯构件弯矩-曲率骨架曲线的钢材本构模型,模型中考虑了钢材的环向拉力作用;并应用提出的钢材模型和已有的混凝土模型编制了纤维模型数值计算程序;分析了含钢率、轴压比、混凝土强度和钢材强度对方钢管混凝土压弯构件截面弯矩-曲率曲线的影响。通过对构件屈服弯矩、极限弯矩的分析,提出了一种方钢管混凝土压弯构件的三线性骨架曲线,该曲线可用于工程中方钢管混凝土框架结构的动力学分析。
Nonlinear analysis of member cross-section is an important foundation for seismic behavior analysis of structural members. Aiming at the characteristics of three-direction force of steel tube in CFST, a new type of steel suitable for calculating moment-curvature curve of concrete-filled CFST members Constitutive model, the model takes the circumferential tensile force of the steel into consideration; and the numerical calculation program of the fiber model is established by using the proposed steel model and the existing concrete model; the analysis of the steel ratio, axial compression ratio, concrete strength and steel strength Effect of Curved Moment - Curvature Curve of Sectional Concrete Filled Steel Tube Bending Members. Based on the analysis of yielding moment and ultimate bending moment of members, a trilinear skeleton curve of concrete-filled square steel tube (CFST) is proposed, which can be used to analyze the dynamic behavior of CFST frame in China.