Nonlinear Analysis Of Cable-stayed Bridge With CFRP Cables

Cable-stayed bridge is a rational, economical and esthetic type of bridge structure. It is one of the chief types for long span bridges. Steel cable is high weight, corruptible and fatigable. But CFRP (Carbon Fiber Reinforced Plastics) cable is high strength, light weight, corrosion free and fatigue resistance. So using CFRP cable will be the essential approach to settle the fatigue and corrosion problems of steel cable, and it is one of approaches to increase the span of cable-stayed bridge. According to the structure nonlinear analysis theory, this dissertation analyzed the mechanical characteristics of cable-stayed bridge with CFRP cables. The paper gives several results as follows:(1) Nonlinear behavior and the load-carrying capacity of cable-stayed bridges are the subjects of this study. Since the general finite element packages are usually not convenient or cannot conveniently handle the special features of cable-stayed bridges, a finite element computation procedure considering both geometrical and material nonlinearities for determining ultimate load-carrying capacity is developed in this paper. The geometrical nonlinearities including cable sag effect, beam-column effect and large displacement effect.(2) Combined with the Badong Yangzi River Bridge in Hubei province, the cable-stayed bridge with steel cables and the cable-stayed bridge with CFRP cables are analyzed. The influence quantity of all nonlinear factors of cable-stayed bridge is analyzed. The difference mechanical characteristic of two type of cable-stayed bridge is compared.(3) Combined with the Xiaonan Bridge in Hubei province, the ultimate load-carrying capacity of cable-stayed with steel cables and cable-stayed bridge with CFRP cables is analyzed. It is demonstrated that the in-plane global safety factor of the Xiaonan Bridge is 3.76. The influence quantity of all nonlinear factors to the ultimate load-carrying capacity of cable-stayed bridge is analyzed. The difference structural response of two type of cable-stayed bridge is compared.