异形柱非线性空间杆单元刚度矩阵的推导

Deduction of nonlinear bar-unit stiffness matrix on special-shaped columns

基于一种合理的异形柱截面N—M—φ关系力学模型,用空间杆单元作为基本单元,利用实际刚度法推导出异形柱非线性的单元刚度矩阵,所得到的非线性单元刚度矩阵可应用于钢筋混凝土异形柱的非线性有限元全过程分析。

Based on the reasonable relation of sectional N-M-φ of special shaped columns, using the basic space bar-unit, the nonlinear unit stiffness matrix is deduced by the method of factual stiffness. The stiffness matrix contain the effect on the physical nonlinearity and geometric nonlinearity. The result in the paper was also used in the analysis of the nonlinear finite element whole process for the RC special shaped columns.