悬索结构大位移分析改进的两节点索单元模型

基于非线性弹性理论，提出了适合悬索结构大位移分析的改进的节点索单元有限元模型，在 移函数的表达式中计及了索元自重垂度的影响，从而克服了目前悬索结构普遍采用的现代了点索元无法直接计及自重垂度影响的缺点。

An Improved Two-node Cable Element for Large Deformation Analysis of Cable Structures

An improved nonlinear finite element method with two-node elements is presented in this paper.The effects of cable initial sag have been considered in the element displacement functions.Assuming the cable to be ideal flexible,in terms of the nonlinear theory elastically,the expression of correlation between the axial strain and stress is established.By means of the virtual displacement principle and the Lagrangian expression of the axial strain,the nonlinear finite element formulation has been derived,and this model has been used to compute cable structures.By comparison with the straight-line and curved cable element methods,the proposed model leads to good precision and can meet the engineering requirements.The model presented in this paper can be applied in the analysis of long-span cable structures,such as cable structures,cable domes,cable stayed towers and so forth.