The Reasearch On Reinforcement Method Of Heavy Haul Railway Bridge

With the development of the national economy and the increase of railway freight traffic volume, The heavy haul railway will develop towards heavy axle weight and high tracion.The old heavy haul railway bridges are designed by mid-live load in china.with the consideration of the characteristics of heavy haul railway,when live load is increase,whet-her the heavy haul railway bridge need reinforece or not as well as how to reinforce.it is imminent problem must be to solve for researchers.This article select the24m super-low heigh prestressed concrete simple T-shaped beams which plays the function of control as reseach object, and use Midas to ansys original structure.The accuracy of the model is verified by contrasting caculating results to the existing tests as well as engineering data. What’s more, this article also check the carrying capacity and vertical stiffness of the original beam structure under the action of different live load, and it suggested that the beam need reinforce after increasing live load.On the article of the calculating theory of existing reinforcement, this article numerically simulate the24m super-low heigh prestressed concrete T-shaped girder bridge which reinforced by increasing section method、external prestressing method and auxiliary beam method. By calculating the carrying capacity and vertical stiffness under different actions of the live load, this article shows that the carrying capacity and vertical stiffness meet standard requirement. It gives brief introduction on the construction technology and measures.Lastly, this article has evaluation analysis about above three strengthening method according to the effect of original structure、 vertical stiffness and the carrying capacity.this article advice adopting the auxiliary beam method or the external prestressing method to reinforce original beam.This paper has32graphs,28tables and49references.