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采用普通T形钢管混凝土柱的核心混凝土等效单轴本构关系,利用纤维模型程序分析了不同参数对T形钢管混凝土单向压弯、双向压弯柱截面强度的影响,参数包括钢材屈服强度、混凝土抗压强度、管壁宽厚比、截面肢宽厚比、加载角度和轴压比等.研究表明:混凝土工作承担系数和加载角度对归一化的轴力与弯矩相关曲线的形状有重要影响;截面肢宽厚比和轴压比对归一化的双弯矩相关曲线的形状有重要影响.基于截面全塑性假设和大量数值结果回归分析,提出了T形钢管混凝土柱纯弯、单向压弯和双向压弯截面强度承载力的简化计算方法,简化方法计算结果与纤维模型分析结果吻合良好,简化方法可为工程设计提供参考.
The equivalent uniaxial constitutive relationship of core concrete of ordinary T-shaped CFST columns is adopted. The influence of different parameters on the uniaxial bending strength and the cross-section strength of T-shaped CFST columns is analyzed by fiber model program. The parameters include the yield strength , Compressive strength of concrete, wall thickness ratio, aspect ratio, loading angle and axial compression ratio etc. The results show that the bearing coefficient and loading angle of concrete are important to normalized shape of axial force and moment-related curve Influence on the shape of the normalized dual-moment curve is obtained.With the assumption of full plasticity of cross-section and the regression analysis of a large number of numerical results, the T-shaped concrete filled steel tubular columns with pure bending, unidirectional The simplified calculation method of the bearing capacity of the bending strength and the bi-directional bending section strength, the calculation results of the simplified method are in good agreement with the fiber model analysis results, and the simplified method can provide references for engineering design.