Research On Bearing Capacity And Durability Of Existing RC Bridge Based On Performance Deterioration Of Reinforcement

Reinforced concrete bridges are widely used. Recently With the increase of dangerous and old bridge in our country, there is a serious problem which many bridge researchers face with: how to estimate technology state of existing bridge structure and make reliability evaluation methods by scientific detective and test ways to provide scientific basis for rehabilitation of dangerous and old bridge.In this paper, base on considering the factors as steel-bar corrosion,bond strength decay which influence the structure bearing capacity. introducing each damage evolvement rate into the structure resistance expression of flexural capacity and shear capacity, constructing the resistance expression base on variable ingredient of time and accordingly. By construct limit state equation, the evaluation and forecast of existing bridge capacity and durability is come ture.In accordance with the study process, use the accelerated corrosion method of galvanostatic to corrode the bars and prestress wires. Analyse the tests data to obtain the relationship between Corrosion rate and the effect factors, and give the relationship of the accelerated corrosion test and the actual situation. Take this factor into the Calculation of the carrying capacity of concrete bridge, and give the corresponding computational formulas, afford the evaluation parameters of the existing bridges.A practical bridge's superstructure is assessed in this paper and the result bear out this method is convenient and feasible. And point out the deficiency and development direction of this method. The paper offers a certain reference for the bearing capacity and durability study of reinforced concrete bridges in the future.