Coupling Risk Assessment Of Safety Accidents In Long-span Bridge Construction Projects

Large span bridge engineering project investment scale is huge,the construction period is long,the project participants are numerous,once the engineering accident occurs,economic and human losses are huge.Therefore,in order to better carry out the bridge engineering project safety accident risk management,it is necessary to carry out the coupling assessment of risk events,as well as the coupling assessment of risk factors.Based on the large span bridge construction project engineering accidents and risk factors identification,risk assessment model of construction accidents to build two aspects,comprehensive use of case analysis,literature study method,Delphi method,the expert scoring method and modeling method and other research methods,build the large span bridge engineering project risk factors index system and evaluation model.The main achievements and conclusions are as follows:(1)Six core risk events are identified by case analysis method,literature research method and Delphi expert consultation method,and an engineering accident risk index system for long-span bridge engineering projects is established.The index system includes 5 first-level indexes,16second-level indexes and 123 third-level indexes.(2)By using expert scoring method,fault tree analysis method,complex network theory and depth-first algorithm,a risk assessment model for engineering accidents of long-span bridge engineering projects is established,and the risk level of risk events is evaluated.Risk prevention and control strategies based on target immunity are proposed.Finally,combined with the Mingzhu Bay Bridge project,the risk assessment model is empirically analyzed.Compared with the results of the model,the validity and practicability of the model are proved.(3)The dynamic risk assessment model integrated with a variety of methods and software is conducive to enrich the bridge engineering risk management theory and make up for the deficiency of static risk analysis in the traditional method.According to the complex characteristics of nodes in the risk assessment network,the prevention and control suggestions of risk factors are provided,and the risk level of risk events is calculated according to the risk assessment network,which is beneficial to improve the management level of bridge engineering projects,adjust the investment level of project resources,and reduce the probability of bridge engineering accidents.There are 23 figures,26 tables,and 107 references.