Study On Calculation Methods In Reinforcing Concrete T-Beam With CFRP

With the development of the Nation's Economies, the traffic amount increases rapidly and the loads of the bridges bearing are more and more aggravating. Considering the factors of design construction and age etc, a lot of bridges have been damaged over the days and their carrying capacity have been get down, going so far as to influence their service and need to be maintained or strengthened in time. Among those methods using to reinforcing RC structures, more and more attention has been paid to the method strengthening RC girders with carbon fiber reinforced polymer(CFRP). It has a bright future for its outstanding performances such as high strength, low weight, corrosion resistance, together with the handy operations comparing to traditional retrofitting methods.Firstly, the dissertation introduces the existing bridge reinforcing methods and the application and the development in the future of carbon fiber reinforced polymer, as well as the principle and the breakage type of reinforcing concrete structures with CFRP. Secondly, relative equations of the design theory on reinforcing concrete structures with CFRP are introduced, and in the meantime, this dissertation calculates the normal section flexural capacity of ZhaoDi bridge after reinforcing with CFRP, with the conclution that the normal section flexural capacity is improved by 28.1%.Finally,through the project example, this dissertation establishes the finite element modes of the ZhaoDi bridge. Both of the simulations including plane bar system and spatial entity that have their advantages and disadvantages would satisfy the reinforcement design requirements. The former is easier to control and the latter whose calculation is difficuilt would simulate the actual stress state of the bridge more veritably. So the stiffness and the carrying capacity of the T-beam should be revised when we calculate with plane bar system. The dissertation advises that the section stiffness should be improved 15% and the carrying capacity should be improved 40%, to simulate the actual reinforcement effect of the T-beam after reinforcement with CFRP.After the load experiment and the analysis and calculation of the bridge, this dissertation gets the conclusion that the carrying capacity of the bridge is greatly improved after the reinforcement with CFRP, whose construction is convenient, rapid and is worthy of extension and utilization.