T Rigid Frame External Prestressing Reinforcement Of Research And Analysis

External prestressing is a kind of no felt prestress. Because of it's strong suit: force approach is clear; the prestress loss can compensate by another drawing; the section of the girder is no weakening; the loss of friction is low etc, which make it used widely in bridge frame. With the economy developing quickly, there are many bridge, which bearing the weight of ability have been declined because of over loading and approaching to fixed number of used year, many bridge are in danger, whereas rebuilding the new bridges will expend mint capital, so it is imperative under the situation. The external prestress is a brief reinforced measure especially to many T-rigidity bridge built in 50-60's.The paper analyse the basic theory about reinforced measure by prestress outside, contemporarily analyse the Zini bridge used finite element, bring forward the rational and safe process on reinforced design. Draw the curve of the flexibility and prestress loss by contrasting the different prestress and corresponding flexibility; Analysing the connection of the temperature grads and end flexibility, the result is that the the temperature grads affect the section stress and end flexibility toothfully, whereas the system temperature affect end flexibility greatly; Analysing the hang girder's status by BRCAD simulating calculate, and draw the support reaction on the condition that QC-20 or GC-100; Managing the method of rigidity beam to loading Niutui ; Analysing the stress of anchor place by finite element, draw the result of entity stress and distortion, know the region about biggish stress, offering credibility result for designing anchor-block. Analyzing Zini can offer a logical method for similar T rigid frame and a loading predigesting means.