Risk Assessment on the Effect of Weather Factors on Civil Engineering Facilities in a Metro System

In recent years, the global climate change has triggered higher occurrence rate of natural disaster， the failure of civil infrastructure function has caused enormous social and economic loss, which reminds people to recognize the importance of risk assessment on civil engineering facilities. This paper takes safety risk assessment of influence of weather factors on urban metro transit facilities by using the methods of FTA, AHP and fuzzy evaluation theory, provides risk assessment index system, calculates the relationship between weights of three weather factors, and establishes a Risk evaluation model based on AHP-Fuzzy Synthetic Evaluation with an example of the section between Beiyuan station and Wangjingxi station in line 13 in Beijing. The results are useful to identify security risks in urban metro transit facilities system, and to improve it.