Assessment Of The Risk During The Operation Of The Bridge Based On The Method Of The Analytic Hierarchy Process And Fuzzy Mathematics

Since our country enter the21st century,the national economy has significantly increased, modern traffic engineering construction enterprise development, The level of the bridge construction also promotes high grade. Bridge construction difficulty increasing, the application of new technology constantly, the span is also increasing. A series of bridges attendant problems surfaced, Where the risk assessment of existing bridges are more and more concerned by experts and public. As the throat of the traffic bridge, by the large number of existing bridges with the natural environment erosion and traffic volume, increasing traffic loads, its security is affected in different degrees.Built Bridges, especially conduct the risk assessment of long-span Bridges, as to how to bridge the theoretical foundation of the economic and reasonable maintenance, to ensure the safety of bridge during operation with cannot be underestimated.For the increasingly frequent incidents of bridges as well as economic and security issues closely related thereto, requires a combination of China’s actual situation, the bridge at different times of risk to make more scientific evaluation, in order to develop a reasonable coping strategies, and take more effective measures, improve safety during construction and operation of the bridge.AHP is widely used in the evaluation of fuzzy concept, this paper focuses on the feasibility of AHP as a method of assessment of the risk during the operation of the bridge. Firstly analyzes AHP, fuzzy mathematics, gray theory method, combining these three methods to form a method for analyzing fuzzy information. The method used in the risk assessment during the operation of the bridge, assessment of the results obtained have some validity, science, which can be more accurate assessment of the risk level during the bridge operator. Then take some measures against the risk coefficient of high risk factors listed bridge reinforcement to ensure bridge safety in operation.This paper takes Xinjiang Guozigou Bridge as an example, By using the AHP, fuzzy mathematics and grey theory, establish the risk evaluation model, the operation risk grade of the bridge evaluation, the actual situation contrast, verify the validity and practicability of the evaluation method.Through the Xinjiang Bridge Guozigou risk assessment modeling analysis, finally we can draw the influence degree of each risk factor to the security of the bridge during the operation, then take out some reinforcement programs against the risk coefficient of high risk factors.And the assessment methods for the reinforcement program provides a theoretical basis, and the evaluation method can also be applied to future similar risk assessment, which also have certain practical significance.