Research On Durability Evaluation Technology Of Existing Double Arch Bridges

Double arch bridges are the most models of arch bridges built in our country in 1960s. They made a great contribute for the development of our country' shighway and bridge. But, under the overload and heavy traffic for long time, most of the double arch bridges have different durability problems which influence directly the safe service of the bridges. Therefore, it is very important to evaluate these bridges and supply reliable reference to the maintenance and strengthening of bridges.Bridge durability evaluation is the process of using special information and using appropriate analytical method to analyze bridge's durability and making corresponding engineering decision. At first, the paper elaborates the influencing factors and durability detection methods of the factors. According to international and domestic research results and current codes, the durability evaluation model of the existing double arch bridge is set up and the hierarchical structure of durability evaluation indexes system is proposed on the basis of the analytical hierarchy process (AHP). The weight of durability evaluation indexes is determined. The membership functions of evaluation indexes corresponding to evaluation grade are founded. Using durability fuzzy synthesis evaluation, the paper establishes the durability synthesis evaluation technology of double arch bridges. At last, typical engineering example is selected to be evaluated. The evaluation results agree with realistic station which proves this evaluation method is feasible. So, the article has the certain instruction significance for the durability evaluation of homogeneous bridges in the future.