The Theory Of CFRP Streng Then Concrete Bridge And Reach On Qinghong Bridge Reinforcement

The structure of the bridge is under the function of many kinds of factors of external world, it is sure to destroy to produce with the change of time, thus cause the bearing capacity in the bridge to reduce, slacken the service life of the bridge seriously, threaten the security of the vehicle goes and the pedestrian one, especially the damage of some large-scale bridges brings the enormous economic losses to country. The destruction in various degrees has appeared in most bridges that our country built in early days, so bridge reinforcement has the important status of the science of bridge building in our country. There is many kind in the method strengthened in bridge, such as increasing the sectional law, increasing the law of prestressing force , outside to stick to the law of stencil plate etc. It is a new technology of gluing the strengthening construction of high-performance composite application outside, and CFRP strengthens the concrete bridge structure has many kinds of advantage, so it is very extensive application in the foreign countries.In recent years, bridge strengthening was application in our country, and theoretical research of bridge reinforcement is limited. This text is on the basis of domestic and international strengthening experimental research, to analyze the stress and strain distribute law, and summarize CFRP strengthen tip , strip and destroy, concrete of bridge stress centralized stripping the main destruction form of destroying etc. At the same time, it analyzes the change law of tip stress under the function of vehicle dynamic loads. To derive out the relation between CFRP thickness and curved distance of limit, so it extracts formulate of resisting curved and resisting cut bear, which adopts CFRP slice to strengthen the concrete bridge structure. According to the design method in the article, it can design the actual project, and make the detailed construction scheme. Utilize the element analysis software ADINA to simulate the design method, and it is indicated that the adopted theory and design method can be application in the bridge reinforcement with prestressing concrete beam.