Nonlinear Analysis Of Large Span Cable Structure Using A Tow-Node Curved Element

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 function. Assuming the cable to be ideal flexible , in terms of nonlinear theory elastically, the expression of correlation between the axial strain and stress is established. By means of the virtual displacement principle and the Lagrange 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.