Reinforcement Effect Analysis And Evaluation Of Girder Bridge Based On FEM Method

At present our country transportation industry developing rapidly, but general situationview, Chinese eastern, central to western region’s new construction gradually reduce, thebridge maintenance, repair, reinforcement and reconstruction project is becoming mainstreamin the next10to20years. From our country’s construction and operation situation, there willbe a large number of bridges more or less appear different diseases, as long as there is socialbenefit and economic benefits, are worthy of reinforcement. Actually those engineering ofbridges’ strengthening are more and more, but the research of bridges’ reinforcement designand calculation still lags behind relatively.In this paper, the bridge reinforcement method such as enlarging section method, stickyfiber method, paste steel and hybrid strengthening method is described in detail, and usingsoftware MacAfee to evaluate the effect of reinforcement. It simulates the performance ofpriestesses concrete T beams，studying the strengthening effect of five types of measures，such as carbon fiber adhesion method，steel plate adhesion method, section-enlarging methodand steel plate carbon fiber plus section-enlarging method. It analyzes their strengtheningeffects，including ultimate flexural capacity，deflection，rigidity，ductility and creakpropagation，and summarizes their advantages and disadvantages. The study indicates that，section enlargement plus steel plate adhesion has the best effect in increasing the flexuralcapacity and rigidity，restraining the development of cracks，but it may reduce the durabilityof the beam. whereas carbon fiber adhesion method and steel plate adhesion method canimprove ductility of T-beams，for beams with great depths，carbon fiber adhesion methodhardly has effete，hence must be used carefully in practice.