Assessment of Bridge Construction Safety Risk based on Improved Cloud Model

Abstract

In order to solve the problems of fuzziness and randomness of assessment in bridge construction safety risk, the method of bridge construction safety risk assessment based on cloud model and uncertain analytic hierarchy process was put forward. Firstly, the characteristics of bridge construction were analyzed, and combining with engineering practice, the index system of construction safety risk assessment was established. Secondly,standard cloud model for bridge construction safety risk assessment was proposed through improved cloud model generation algorithm, and fuzzy value of index weight were converted into accurate value by uncertain analytic hierarchy process and set pair analysis method. Finally, the comprehensive evaluation cloud map was obtained through forward cloud generator based on the weight and safety evaluation information of each construction safety risk index, and compared with the evaluation grade standard cloud, so as to determine the safety risk grade of bridge construction. The feasibility and effectiveness of the proposed method was verified through application of Wujiagang Yangtze river bridge in Yichang. The results show that the safety risk level is "IV grade" , and it is necessary to take some risk management measures to reduce the risk.