轴力和双向受弯作用下短钢管混凝土梁柱的非线性分析

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。

Nonlinear Analysis of Short Concrete-Filled Steel Tubular Beam-Columns Under Axial Load and Biaxial Bending

This paper presents a nonlinear fiber element analysis method for determining the axial load-moment strength interaction diagrams for short concrete-filled steel tubular (CFST) beam-columns under axial load and biaxial bending. Nonlinear constitutive models for confined concrete and structural steel are considered in the fiber element analysis. Efficient secant algorithms are developed to iterate the depth and orientation of the neutral axis in a composite section to satisfy equilibrium conditions. The accu...