Experimental Study On Lateral Integrity Reinforcement Of Prefabricated Hollow Slab Bridge

China's economic development is rapid and the country is changing with each passing day.In China's highway and urban roads,hollow slab bridges are widely used because of their simple structure and fast construction.Because of the early construction technology and design,many hollow slab bridges have been unable to meet the needs of current development.Under the long-term alternating load and overload load,a large number of diseases appear in hollow slab bridges,especially the stress problem of single slab caused by hinge joint failure.Not only in our country,but also in other countries.Compared with demolishing and rebuilding,reinforcing and rebuilding old bridges can save a lot of manpower and material resources,and the economic benefit is remarkable.Therefore,engineers have carried out a series of studies on the reinforcement and transformation of hollow slab bridges,and proposed external prestressing reinforcement method,bridge deck reinforcement method,strengthening lateral connection reinforcement method and bonding reinforcement method.On the basis of full investigation and study,this paper focuses on the strengthening method of transverse connection in view of the failure of hinge joints.The main contents of this paper are as follows:?Based on the theory of transverse reinforcement of hollow slabs,the finite element model is established by the grillage method.The reinforcement models of different spacing of beams with spans of 10 m,13 m and 16 m are studied respectively.The damage degree of hinge joints is reflected by adjusting the thickness of virtual beams,and the influence lines of transverse distribution of mid-span positions are compared and analyzed.?According to the finite element models with different spans and spacing of beams,the theoretical calculation and comparison of the strength transfer capacity of hinged joints,the overall performance of transverse connections and the vertical deformation of the reinforced hollow slabs are carried out.The reinforcement method of transverse bonding and anchoring steel beams at the bottom of the slabs to improve the overall transverse stiffness is proposed preliminarily.?Combining the above theoretical calculation and analysis,a real bridge model is made,and the experimental method and theoretical calculation are used to verify the comparison.It proves the reliability of the reinforcement technology of transversely bonded anchored steel beams on the bottom of hollow slabs.This method can not affect traffic or minimize the impact on traffic,and has a strong application value.?According to the above analysis,through the reinforcement example of bonded steel beam+ glue filling,the theoretical value of hinge joint integrity obtained by finite element modeling and the data before and after reinforcement by static load experiment are compared and analyzed,which provides practical basis and guidance for the reinforcement application of hollow slab bridge.