Research On Safety Risk Assessment Of Cable-stayed Bridge Construction Based On Two-dimensional Cloud Mode

The rapid development of infrastructure in China has been accompanied by an increase in the number of road bridges.The construction process is fraught with uncertain risks that lead to delays in construction schedules,construction accidents and even serious casualties.Therefore,in this paper,the Menggu Nujiang cable-stayed bridge mega project is taken as the basis of the research,the safety risks of cable-stayed bridges are analyzed,an identification matrix is built based on the work stages and work risks,built an index system to evaluate the safety of rope bridges based on the identification and review of factors,and combined the C-OWA and CRITIC method to determine the subjective and objective weights,and then used a combination of game theory to determine the weights for the final determination of the weights.Final determination of weights.In combination with the theory of two-dimensional cloud model,a risk assessment model for the structural safety of cable-stayed bridges was constructed and verified in the Menggu Nujiang Bridge Special Project.In this paper,the theoretical knowledge is analyzed,existing research results are compared and analyzed,key risk factors from existing literature as well as project information are collected,and risk determination methods and steps are developed.Initial risk indicators were identified based on five aspects: technical factors,personnel factors,construction techniques,management factors,and environmental factors.The selection of the indicators was completed by calculating the cumulative contribution factor,sensitivity and independence of the indicators.Secondly,the objective and subjective weights were determined using the C-OWA operator weighting method and the CRITIC method,and the complex weights were obtained after optimization analysis of the weights using game theory.Using a twodimensional cloud model,the overall risk assessment model was constructed from two perspectives,risk probability and risk loss.After real calculations,it was proved that the safety risk of the cable-stayed bridge structure is level III,which is a medium risk and corresponds to the actual situation.Finally,appropriate countermeasures to the possible risks were proposed.Starting from the five aspects of technology,personnel,construction process,management and environment,reasoned opinions were presented as the theoretical basis for the subsequent safety risk assessment of the cable-stayed bridge structure,which has more practical significance.