Strengthened With Carbon Fiber Sheets Simulation Analysis Of Cable-stayed Bridge Pylon

Cable-stayed bridge is composed of the tower, the cables and girder. The box-shaped prestressed concrete section is most frequently used in cable-stayed bridge. The larger cable-stayed bridges span increase, the bigger cable forces cause in anchorage. Besides, stress performance of opening hole in bridge tower will be complicated because the holds weakened the tower section. Moreover, it could endanger the safety of the whole bridge if crack occurred because of improperly design.On the basis of finite element analysis software ANSYS, reinforcement scheme for anchorage zones of Zijin Bridge has been precisely analyzed. The main results of this paper are presented as follows:1. The stress performance of anchorage zones has been analyzed through two-dimension Plane finite element program.2. three-dimension finite element model has been established by using APDL language, which beam element is used to simulate the prestressed steel tendon and temperature reduction method is used to simulate the prestress process. With the comparison of before and after reinforcement, the stress distribution of pylon anchorage zone has been studied under cable force and annular-prestressing tendon.3. The cracking process of anchorage zones has been studied through loading——stress curve by Simulation analysis of cable-stayed bridge tower's anchorage zone strengthened by CFRP sheets,which considers material nonlinearity.4. Finally, the reinforcement scheme has been evaluated after comparing the stress distribution before and after reinforcement.The analysis indicated that the stress distribution of anchorage zones is extremely complex. Instead of preventing the crack in concrete, reinforcing the cable tower by carbon fiber sheet can limit the crack propagation, and it is effective to improving the load-carrying capacity.