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建立数值程序,对钢管混凝土框架进行非线性分析。通过采用轴力和弯矩共同作用下梁柱结构稳定求解中的稳定函数,考虑几何非线性。通过追踪沿杆件长度方向选定的横截面上的纤维单轴应力-应变关系,描述横截面上及杆件长度方向的塑性发展。由于位移控制方法具有数值稳定性和有效性,基于此,采用增量迭代法,求解非线性平衡方程。通过与试验和已有求解结果的比较,验证了本方法的准确性。对于钢管混凝土结构的非线性分析,数值分析是有效的。
The numerical procedure is established and the nonlinear analysis of CFST frame is carried out. Through the use of the axial force and bending moment, the stability function of the beam-column structure is solved stably and the geometrical nonlinearity is taken into account. The plastic development in the cross-section and in the length of the bar is described by tracking the uniaxial stress-strain relationship of the fibers along a selected cross-section along the length of the bar. Because of the numerical stability and validity of the displacement control method, an incremental iteration method is used to solve the nonlinear equilibrium equation. The accuracy of this method is verified by comparison with the experimental results and the existing ones. For the nonlinear analysis of CFST structure, numerical analysis is effective.