Durability Analysis Of Reinforced Concrete Bridge

Recent engineering ivestigations show that there are more and more desturction cases induced by the durability of reinforced concrete bridge. And corrosion of Steel is very popular, it causes many problems not only ill effect on people's life but also it brings people lose of money. So it is a very important assginment to research of reinforced concrete bridge sturcture durability.Based on the durability of reinforced concrete bridge 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, the present research works of concrete dufability are systematic elaborated. Especially introducing reinforcing bar corrosion in detail. Then it studies the influence of durability damage on the peiformance of reinforced concrete bridges structure. As an exanlple , the primary factors which affect carrying capacity of corroded concrete bridges are considered to include reduction of reinforcement section and yield strength and bonding stress between corroded steel bars and concrete, a method to calculate the bending strength of corroded reinforeed concrete beam is proposed. At last according to characteristic reinforeed concrete bridge and requirement of durability comprehensive evaluation, according to the the combination of fuzzy sets with the analytic hierarchy process, the fuzzy comprehensive evaiuation model for bridge is established, author set up a evaluation of concrete bridge applying fuzzy theory based on the durability damage. According to comparing the actual test result of the bridge with the result of fuzzy evaluation the author proposed , the result is believable, so it is utility.