Mechanical Analysis Of Self-anchored Suspension Bridge

At present, self-anchored suspension bridge is developing quickly. However, there are not many papers that study the mechanical characteristics of self-anchored suspension bridge.According to the construction characteristics of the self-anchored suspension bridge, use rigid support continuous girder modeling stiffening girder and catenary element simulating the main cable. Based on the force equilibrium at each node of the main cable and compatibility of deformation, the main cable shape and the unstressed length of main cable are calculated iteratively utilizing the function between the element projections and cable force components at the ends of the catenary element.Stiffening girder, tower and suspenders are simulated with plane beam elements. Set the parameters of catenary element on the basis of analysis result of main cable shape and the principle that the unstressed length of main cable between suspenders is constant. Giving thoughtful consideration for sheave shoving, movement of tangent points between main cable and the sheaves and the action of temporary supports, non-linear finite element method for forward analysis of construction is presented according to the actual working procedure. Based on the proper analysis model, optimization of suspenders drawing and adjusting of construction divergency are discussed.Simplified deflection differential equation of self-anchored suspension bridge is deduced through deflection theory. Substituent beam method and non-linear finite element method are utilized to calculate internal force and displacements of the self-anchored suspension bridge under live load, compare the result of the two methods and discuss tine precise of deflection theory.