STATIC BEHAVIOR OF LONG-SPAN RC CABLE-STAYED BRIDGE WITH FRP CABLES

Based on previous studies of thousand-meter scale cable-stayed bridge with FRP cables, the design method of cables and the static behavior of FRP long-span RC cable-stayed bridge are further investigated in this paper, which focuses on the limitation of insufficient use of FRP cables and potential extension of their applicable spans. The static and fatigue properties of FRP cables were first experimental studied, based on which design method aiming at high-efficiency use was proposed. A three-dimensional finite element simulation was adopted to study the static behavior of RC cable-stayed bridge with different FRP cable including carbon FRP (CFRP), basalt FRP (BFRP), hybrid basalt and carbon FRP (B/CFRP) and basalt and steel-wire FRP (B/SFRP). The major results show that (1) hybrid design of FRP can enhance the integrated behavior of FRP and obtain mechanical behavior required by cable-stayed bridge; (2) the design stress of FRP cable determined by fatigue strength benefits improving of the utilization efficiency and overcoming the limitation of strength and stiffness equivalent design methods; (3) compared to RC cable stayed bridge with steel cables, cable-stayed bridges with FRP cables exhibit sufficient stiffness under the state of serviceability and cause slight influence to the structural behavior of main girder.