Research On Bridge Group Risk Assessment Method Based On Fuzzy Clustering And Analytic Hierarchy Process

With the rapid development of China’s economy,the traffic volume of China’s big cities has increased dramatically year by year.More and more overpasses,viaducts,cross-line bridges and landscape bridges form the transportation network of big cities.Most of the bridges are everywhere.In an extremely important position.At present,most of the risk assessment of bridge operation period is analyzed by fuzzy analytic hierarchy process.This analysis method only stays in the semi-quantitative and semi-quantitative analysis state,which has great subjectivity and uncertainty.How to accurately and scientifically realize the risk assessment of bridge group operation period is an important problem faced by managers.This paper establishes a new theoretical framework for risk assessment of bridge group operation period.The research contents are as follows:(1)The fuzzy clustering algorithm is applied to the risk assessment of bridge group operation period for the first time to achieve horizontal comparison of bridge groups in a region.All the fuzzy clustering algorithms are matrix quantitative calculations,which solves the shortcomings of semi-quantitative semiquantitative calculation of traditional risk assessment algorithms.(2)Optimize risk source analysis.Field data were collected from the risk sources of 50 bridges in Tianjin,and the possible risks of the bridge were quantified into six indicators,avoiding the subjectivity and uncertainty of the qualitative analysis of risk sources in other risk assessment methods.(3)Combining the fuzzy clustering algorithm with the analytic hierarchy process to make up for the shortcomings of the fuzzy clustering algorithm,not only can realize the classification of the risk during the bridge operation period,but also the quantitative weight analysis.Finally,using fuzzy clustering algorithm and fuzzy analytic hierarchy process to compare the risk assessment of the same 50 bridges,the results show that the fuzzy clustering algorithm has incomparable superiority in the risk assessment of bridge operation period,which perfectly solves the traditional method semi-qualitative half.The disadvantages of quantitative analysis and the inability to compare horizontally.The optimized fuzzy clustering algorithm can also analyze which risk source is the most threatened and calculate the weight of a bridge.The example proves that this weight analysis is more reliable than the fuzzy analytic hierarchy process.