The Old Bridge Assessment And Maintenance Funds Allocation Optimization Study

From the point of bridges maintenance management in small scope, this paper discussed the assessment of old bridges and properly distribution of bridge maintenance fund that fit in the condition of little bridge quantity, simple bridge type and limited maintenance.This paper researched the theory and steps of comprehensive evaluation on bridges' existing load capacity by the way of fuzzy nearness, and compared this results with which came out by maximum membership degree method. We came to the conclusion that the first one is more accurate and credible than the last one. Then by the use of AHP, it gave the estimation of bridge' s defect condition and comprehensive condition, and established the corresponding models. Applicating the multiple-objective decision-making technique and considering the factors in the process of making bridge maintenance plan, it established the 0-1 multiple-objective linear programming model which could be used for distribution of bridge maintenance fund. With the help of genetic algorithms and GA programs, it worked out the optimum distribution of bridge maintenance fund.Using the example as study object, this paper demonstrated the application of multiple-objective decision-making method on bridge maintenance planning, and with the result, it proved the superiority of fuzzy nearness method on bridge load capacity evaluation and the feasibility of multiple-objective decision-making method on the distribution of bridge maintenance fund.