Studies On Fuzzy Classification Method To Priority Inspect And Evaluate The Bearing Capacity Of Bridge

By 2010, over 658,100 bridges have been built in china. Subjected to the increasing changes of environment, aggravation of the traffic,inadequacy of maintenance and inspection and defect of construction and design, existing bridges have appeared different degrees of injury. In order to ensure the continuity and safety of traffic, we need to evaluate the health condition of existing bridges, the carrying capacity of the bridge need to be ranked to reasonably allocate funds consumed on maintenance, repair and reinforcement of bridges.Based on the regular bridge inspection data, this paper proposed the fuzzy classification method to evaluate the carrying capacity of the bridge. According to the mechanical characteristics of the bridge, used the analytic hierarchy process to build the multi-level evaluation model of bridge carrying capacity,and introduced the conception of series components, parallel components redundancy components. Combination with expertise and existing research results, proposed the evaluation criteria of component damage, established the judgement matrix after consulting experts, establish a weight collection of influencing factors. In order to take different component damage levels into account, this paper introduced the variable weights principle, used variable weight fuzzy comprehensive evaluation method to evaluate the carrying capacity of bridges, carried out the fuzzy evaluation rules of series system to evaluate series components, converted the evaluation results from grade membership vector to centesimal grade to determine bridge carrying capacity ranking.Finally,this paper used Highway Bridge Maintenance Specification and variable weight fuzzy comprehensive evaluation method to carry out evaluation and compared the results with that of load test.