Research And Application Of Bridge Reinforcement And Reconstruction Technology

The reinforcement and reconstruction technology of existing bridges is always a problem researched and discussed both internationally and domestically.With the development of the new material and technology,embedding steel bar in the cement and paste carbon fiber technique have become new reinforcement methods for structures.The article aims at large scale reinforced concrete construction members whose sectional dimensions are limited.Through researching the theory and method of pasting carbon fiber on the sides of beam to reinforcing its bend and shear strength,the theoretical calculating formula of bend and shear bearing capacity by pasting carbon fiber to strengthen reinforced concrete beams is put forward.By means of researching analog test in lab,analyzing reinforcing effects under many kinds of paste model and comparing with theoretical calculating results,the stress-strain condition of concrete,steel bar and carbon fiber,and the improvement degree of bearing capacity of structure before and after reinforcement are summarized.Finally the bend resistance and shear design method of pasting carbon fiber to reinforce bridge are put forward,and tally with actual project requirement.On the basis of above design theory and method,this article is established in Reinforcement Project of Ruyi Large Bridge of Huhhot Airport Road and combines reinforcement examples,Such as Wuertegou Large Bridge in Wuhai City,Buridu Large Bridge in Erdos City and so on.By using simple and applied method which conforms to reality,the slab(girder) and bent cap of bridge are embedded steel bar and pasted carbon fiber respectively to carry out bend resistance and shear reinforcement design.Dead load examinations before and after reinforcement are implemented,and static strain,static displacement and crack of structure are tested,thus the whole reinforcement effect of bridge structure will be assessed to provide theoretic basis and design method that can be abided by for the reinforcement and reconstruction of small and medium scale bridge. Meanwhile,construction technology and technical requirement during reinforcement are definitely prescribed,and a perfected system of design and construction for bridge reinforcement and reconstruction are formed.With the reinforcement property of embedding steel bar and paste carbon fiber having been further researched and known step by step,they will certainly be developed and applied widely in bridge reinforcement area.