Calculation Of Stress And Deformation Of Beam Structures Strengthened With Prestressed CFL

The technology of reinforcement with Fiber Reinforced Plastics(FRP) is the structural strengthening of domestic and international hot spot. Use of FRP reinforcement on the beam directly, the high strength of FRP can not be fully utilized. The prestress technology is able to effectively solve this problem. Direct tension method and inverted arch method are commonly used in prestressed method. Recently, there is little related researches about inverted arch method, In view of this situation, this paper research on using externally prestressed tendon method and lift-up method to calculate the stress and deformation of flanged beam and box girder. The main research content and conclusions are as follows:1. Interfacial stress analysis of strengthening steel-concrete composite beams with FRP. Compared and analyzed the direct tension method and inverted arch method. By using theory and finite-element method to calculate the strengthening beam, the results indicate that: stress concentration in the plate end, but the inverted arch method make less Interfacial stress than the direct tension method.2. Calculation of the stress and deformation of PC flanged beam. Made the calculation of the flanged beam and the flanged beam strengthened. By using externally prestressed tendon method and lift-up method to calculate the stress and deformation of flanged beam, the results indicate that:by using externally prestressed tendon method, CFL can get the necessary prestressing, the bearing capacity of beams strengthened achieved the design value of B Class.3. Calculation of the stress and deformation of PC box girder. By using externally prestressed tendon method and lift-up method to calculate the stress and deformation of box girder, the results indicate that: By using externally prestressed tendon method, CFL can get the necessary prestressing, the bearing capacity of beams strengthened achieved the design value of B Class.4. Calculation of the stress and deformation of PC flanged beam and PC box girder with CFL prestressing, the results indicate that: By using externally prestressed tendon method, CFL can get more prestressing than the lift-up method . By using externally prestressed tendon method need more load than the lift-up method.