Test Study On Loss Of Prestress In Prestressed Concrete Continuous Curved Girder Bridge

With the urban road and road transport developing and pre-stressed curved bridge is widely applicable, pre-stressed curved bridge has become an important bridge type in modern road transport. At the same time, the level of theoretical research and engineering technology is high, but there are still a lot of areas need to refine and improve. There are still many issues to be resolved on curved girder bridge, one of them is loss of prestress which is much more typical and outstanding. As the existence of the horizontal curvature, the result of friction loss is different from "standardize". In this paper, prestressed concrete continuous girder bridge is studied by using finite element analysis tool with support project.Firstly this paper summarizes the losse of prestress calculation method on straight and curved bridge girder bridge, and analyzes the structure of curved bridge calculation principles and the practicability of methods; Then background to support project for researching, it proposes indirect method to testing the loss of prestress value, and analyzes the impact factors on difference between the theoretical value calculated according to specifications and test value, including the design parameters, construction deviation, measurement deviation and so on; According to test result this paper rules out partial factors, and the main factor is the curve bridge construction deviation which causes that friction parameter values are different between theory and test; Using finite element analysis software modeling for experimental bridge under different curvature for parameters of sensitivity analysis, it analyzes influence of parameters'variety on the calculation results of the friction loss; Finally, combination of parameter sensitivity analysis and field test result, this paper obtains that the value of friction parameter (k,μ) is relative to the curvature radius of the bridge.