Durability Assessment Of Existing Reinforced Concrete Bridges

Reinforced concrete bridges are widely used. However, the durability problem of a large number of concrete bridges is being more and more serious and has been a research hotspot in the civil engineering at the present time.Based on the durability of reinforced concrete bridges and on the full analysis of research results over the world, the thesis makes a more deep-going and systemic study of the durability in three directions of material, element and structure.Firstly, the thesis analyses the factors and damage mechanism of durability; Then it studies the influence of durability damage on the performance of reinforced concrete bridges structure and crack on the durability of reinforced concrete bridges; At last, based on the analytic hierarchy process, it adopts the A -type subordinate function to set up the durability index assessment model of the existing reinforced concrete bridge's superstructure on the basis of fuzzy mathematics. In the thesis, by fixing the weights of the durability index, it well solves the problem that different bridges should adopt different index weights according to damage degree. A practical bridge's superstructure also is assessed in this paper and the assessment result matches the actuality well, so the method is proved to be feasible. The paper offers a certain reference for the durability study of reinforced concrete bridges in the future.