The Numerical Analysis On Bending Behavior Of External Prestressing Reinforced Simply Supported Bridge

External prestressing technique which is one important branch of post-tensioned prestressmg system takes great part of reinforcing bridge. External prestressing technique is a method of reinforcing concrete which hauls prestressing reinforcing steel, fixes prestressing reinforcing steel bar onto the steel anchor box to import(introduce) a man-made numerical value of distributing inner stress in need and changes the stress of concrete in order to partly or fully counteract the stress which is begeted by outer load.It belongs to initiative reinforcing method.This article's background is the Pu Gou bridge of Liaoyang in Liaoning Province which was strengthened by external prestressing technique to upgrade the load grade. The finite element models of nonlinear analysis of external prestressing concrete bridge is finished by the finite element analytical software of ANSYS. Also nonlinear effects of material, geometry and boundary conditions are taken into account in these models.For analyzing the resisting-bend behaviors of inforced T beam bridge contrast against the initial bridge uninforced and evaluating enforcing impact, datas produded by finite element models is contrasted with a great number of measureed datas. The effectiveness of the location of steel anchor box and deviaror, effective prestressing force, the area of prestressing tendon and the position of load on the behaviors and the ultimate loading capacity of T-beam bridge have been fully discussed.Results of analysis indicate external prestressing technique can improve the behaviors of the T-beam bridge and increase the ultimate loading capacity of bridge.The actual prestressing and area of prestressing reinforcing steel bar have great influence on bridge.With the actual prestressing and area increasing, the ultimate loading capacity of bridge will also be argumented.The height of the deviator can change the offsetting of bridge.If the height is heightened,the carrying capacity of bridge is also argumented.The setting location of prestressing reinforcing steel bar impacts the ultimate loading capacity of bridge.