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提出一种非线性纤维元分析法用于确定在轴力和双向受弯作用下短钢管混凝土梁柱的轴力-弯曲强度的交互图。针对被约束混凝土和结构钢的非线性本构模型对组合截面中性轴深度和方向采用有效正切算法进行迭代,以满足平衡条件。通过纤维单元分析结果与试验数据和现有解决方案的对比,验证了纤维元分析程序的有效性。采用该程序研究含钢量、混凝土抗压强度和钢屈服强度对于轴力-弯曲交互作用和钢管混凝土梁柱的影响。所提议的纤维元分析方法可以直接用于钢管混凝土梁柱的设计及其他组合结构的非线性分析。
A nonlinear fiber element analysis method is proposed to determine the interaction between the axial force and the flexural strength of CFST beam and column subjected to axial force and two-way bending. Aiming at the nonlinear constitutive model of the confined concrete and structural steel, the effective tangent algorithm is used to iterate the depth and direction of the combined section neutral axis to satisfy the equilibrium condition. The validity of the fiber analysis program was verified by comparing the results of the fiber unit analysis with the experimental data and the existing solutions. The procedure was used to study the effect of steel content, compressive strength of concrete and steel yield strength on the interaction of axial force-bending and the concrete-filled steel tubular beam. The proposed fiber element analysis method can be directly applied to the design of CFST beams and nonlinear analysis of other composite structures.