Study On The Group Assessment Of Highway Bridge Construction Safety Risk Based On Fuzzy Catastrophe Theory

In recent years,the scale of China’s highway bridge construction has shown an increasing trend,and has made world-renowned achievements.However,it is accompanied by a high level of construction safety accidents,threatening the safety of on-site workers,causing a lot of economic losses,and also bringing serious social impacts.Therefore,carrying out research on the assessment of highway bridge construction safety risk is an important topic to realize the concept of safety production policy in China.The thesis takes highway bridge construction safety risks as the research object,and based on the literature materials,code provisions and typical accident analysis,the following main research results are obtained.(1)Based on the characteristics of highway bridge construction and the conception of construction safety risks,the path of highway bridge construction safety risk formation is proposed.(2)The checklist of highway bridge construction safety risks was established based on text mining method by collecting highway bridge construction safety risk literature,code provisions and typical accidents through relevant databases and networks.On the basis of screening risk checklist by Delphi method,combined with “4M1E” and hierarchical analysis method,the highway bridge construction safety risk system is established.(3)In order to scientifically evaluate the highway bridge construction safety risk,the risk factor evaluation process and method were established by using interval fuzzy number and group decision theory.On the basis of the above,the catastrophe structure of highway bridge construction safety risk is analyzed by the catastrophe theory,and a comprehensive assessment model of highway bridge construction safety risks and the corresponding risk level interval are established.(4)According to different risk levels of acceptable criteria,the risk prevention measures matching the highway bridge construction safety risk factors are summarized.Through case studies,the feasibility of the system and model built in this paper is verified,the corresponding risk prevention measures is proposed and the effects of risk prevention measures is briefly analyzed.The thesis has established the process and method of high bridge construction safety risk identification and evaluation,carried out relevant exploration for effective control of bridge construction safety risk,and enriched the study on the highway bridge construction safety risk management,which can be used as a reference for highway bridge construction safety risk identification,evaluation and prevention decision-making.