Research On Static Analysis And Reinforment Design Of Key Part Of Externally Prestressed Concrete Bridge

The deviator is the key segments of the external pre-stressing structure, of which structure and internal force are relatively complex. Therefore the research about stress,structure and reinforcement design of deviator is necessary. The anchorage is another key segments of the external pre-stressing structure,which is the region of high stress. Therefore the research about stress,the variation law of stress and reinforcement design of anchorage is necessary.This paper based on engineering of 12th section of Bai-ma-long high level bridge of the Li-lin high-speed highway in Hun-nan province and the Xin-tan bridge of the south part of the rounding Chong-qing highway. Study the elastic stress about deviator which has multiple strcture used the SOLID45 of ANSYS.Get the stress distribution,extreme value of stress and the worst siteof stress.Then coMPare the stress of different deviator and get the proper structure.When study the stress of anchorage used SOLID45 of ANSYS,account or not the filler plate,the steel angle and the external pre-stressing steel tube.When study the stress of anchorage usd integral type model of SOLID 65 of ANSYS , account the filler plate,the steel angle, the external pre-stressing steel tube and material non-linearity. coMPare the stress of different anchorage and get the rule of stress distribution and the effection of the filler plate,the steel angle, the external pre-stressing steel tube and material non-linearity. Get the rule of evry direct stress of the anchorage by coMParing the direct stress of some route. The strut -and-tie models are used for the reinforcement of the deviator and anchorage ,and give some advices about reinforcement,and get the general law of establishment of strut -and-tie model.Get the stress of bar of the anchorage by establishing the separated type model about anchorage used the SOLID65 of ANSYS ,and get the relation of stress of the bar and stress of concrete which is at the same position and the same orientation.The paper has three innovation points:â‘ Get the variation rule of evry direct stress by generalizing the stress of several route in the anchorage.â‘¡establish the 3-D strut-and-tie model of the anchorage which cross direction and vertical direction is interacted ,and generalize the general law about establishment of strut-and-tie model.â‘¢Get the variation rule of stress of bar in the anchorage by establishing the separated type model.