Safety risk coupling analysis of cable-stayed bridge main girder construction based on complex network and immunization strategy
The construction of the main girder of a cable-stayed bridge is a complex system behavior,and there may be multiple evolutionary paths of risk accidents during the construction process,which has put forward higher requirements for its construction safety risk management.Since the research on risk coupling for bridge construction is relatively weak,this paper proposes a risk coupling analysis method based on complex networks by fully considering the transfer and evolutionary behavior among risk factors.Firstly,according to the bridge construction specification and engineering practice experience,the primary safety risk factors were identified by decomposing the construction operation procedure of the main girder of the cable-stayed bridge,and then the secondary safety risk factors were obtained by analyzing the risk-causing status of each of them.Then,based on complex network theory,the coupled network model of main girder construction safety risk was constructed with the help of an adjacency matrix to characterize the association and causal relationship between risk factors,and the characteristic indicators were studied and analyzed to derive the risk evolution characteristics.Finally,the network efficiency evaluation was introduced and MATLAB software was used to simulate the network with different immunity strategies,including single node immunity,random immunity,and deliberate immunity.The results show that:there is a close correlation between various risk points in the network and between risk points and risk events;the effect of deliberate immunization is significantly better than random immunization;risk factors such as operator operating skills,operator safety awareness,and object strikes play a key role in the network;the safety risk of operator quality is the primary safety risk factor with the greatest degree of influence on the construction of the main girder;taking the immunization results into account,priority should be given to preventing and controlling the risk points represented by the key nodes of the network,to effectively improve construction safety.
safety engineeringmain girder construction of cable-stayed bridgecomplex networkrisk couplingimmune simulation
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