Abstract:The initial equilibrium state analysis is proposed for the self-anchored suspension bridge with spatial cables, through integral analysis of cable-hanger system and tower-beam system. The main study focuses on the coupling characteristic of spatial cable-hanger system and self-equilibrium characteristic of self-anchored system. A simplified model is established in which spatial cable-hanger is simplified as parabola in vertical plane and segmental lines in horizontal plane, and simplified analytical formulas are deduced by the minimum potential energy principle. Steffens-Newton algorithm is employed to solve actual cable-hanger coupling model，and FEA method is incorporated to establish numerical iterative method for entire equilibrium state. The program SASB-IESA is written. A numerical example is solved with the two proposed methods respectively, and their applicability is pointed out based on the comparison of their result accuracy.
