Research On Construction Safety Risk Evaluation Of Comprehensive Transportation Hub Engineering Based On Bayesian Network

In recent years,with the continuous progress of modern transportation construction,the construction speed of comprehensive transportation hub has been accelerating.As an important node in the transportation network,the comprehensive transportation hub has not only transportation function but also certain urban service function.The state has intensified the construction of comprehensive transport hubs and actively promoted the construction process of comprehensive transport hubs.However,the construction safety of the comprehensive transportation hub project has attracted much attention due to its huge investment scale,complex spatial structure,huge professional information and extremely difficult coordination.Therefore,it is of great significance to establish a scientific and effective construction safety risk assessment model for the construction safety management of comprehensive transportation hub engineering.The main research contents of this thesis are as follows:First,the construction safety risk evaluation index system of comprehensive transportation hub engineering is constructed.Through literature research at home and abroad,construction information collection,BIM construction simulation and similar engineering safety accident case analysis,the preliminary construction safety risk factors are obtained,classified and modified,and the risk decomposition structure model(RBS)is formed.The work decomposition structure model(WBS)is formed by decomposing the partial and sub-project with high risk of integrated transportation hub project.Risk factors were identified based on WBS-RBS method,and construction safety risk evaluation index system was constructed.Secondly,the construction safety risk evaluation model of Bayesian network is constructed.Parameters of each node were obtained by questionnaire,and parameters of each network node were corrected by introducing Noisy-OR-Gate model.Risk factors were identified by WBS-RBS method to construct Bayesian network structure,and Netica software was used to perform Bayesian network model calculation.Finally,an empirical study is carried out through the integrated transportation hub project of Beijing Sub-central Station.The construction safety risk of the project is evaluated by constructing the Bayesian network construction safety risk evaluation model,and then the key factors affecting the construction safety risk are obtained by reverse reasoning,so as to put forward BIM based construction safety risk control measures.This provides a scientific and effective risk evaluation method for the construction safety management of comprehensive transportation hub project.