空间折索单元的切线刚度矩阵

Tangent Stiffness Matrix of Spatial Fold-cable-element

预应力空间网格结构是一种新型的结构形式 ,对该结构进行非线性分析计算时 ,需要采用空间索单元的切线刚度矩阵 .通过对于预应力索单元的分析研究 ,推导了具有初始应力的空间折索单元的单元切线刚度矩阵的计算公式 ,并且建立了可用于预应力空间网格结构非线性有限元分析的非线性方程组 .所推导的公式均具有良好的规律性 。

The prestressed lattice structure is a new type of structural form.The tangent stiffness matrix of the spatial cable element would be introduced in the process of nonlinear analysis in the calculation of this type of structure.In this paper,the element tangent stiffness matrix of spatial fold cable element under initial stress condition and nonlinear simultaneous equations for finite element method which can be used in nonlinear analysis and calculation of prestressed lattice structures are developed by studying the prestressed cable element.All of the formulas are orderly and easy to be coded in computer programs.