Study of Economic and Mechanical Properties of Super-long Span Cable-stayed Bridge with V-shaped Pylon

Abstract:

Two finite element models are established in this paper for super-long span cable-stayed bridges with V-shaped pylon or with conventionally erected pylon. Then, some economic and mechanical properties are given by comparative study method. Constructive materials can be saved from the bridge with V-shaped pylon, compared with the bridge with erected pylon. From the derived formula of material saving of pylon and cables, it gets the optimum when the inclination of V-shaped pylon is half of the inclination of farthest cable, and the pylon materials save 6% while cable materials save 1%. But the advantages of V-shaped pylon cable-stayed bridge are reducing the height of tower and the length of hoisting cable and decreasing the moment of tower root by about 26%. At the same time, the inclination of cables in this structural system is larger, the overall stiffness is increased, so the stability factor is improved. In addition, its state manifests better than conventional bridge under horizontal wind load. At last, it is adapt to the development of cable-stayed bridge towards longer span.