Risk Analysis And Safety Evaluation And Risk Control Research Of Existing Beam Bridge

With the development of the bridge construction,the risk of the bridges have been gradually paid much attention during the operation.At present,there are few researches on the risk during bridge operation.With the increase of bridge risk and accident during operation,it is a key problem that to strengthen the risk management mechanism of bridge during operation,and to propose effective measures to solve the risk problem.Combined with the existing bridge in Yunnan province,this paper is mainly aimed at researching the evaluation of the operational security risk of the bridge in service.This paper gives the related concepts and the basic ides of operational security risk evaluation of the bridge in service.,and also introduces the research contents during the risk assessment.On the base of these efforts,the index system of the operational security risk evaluation of the existing bridge is established.By using a research approach mixing AHP and GRA together,this paper analyzes the safety condition of the existing bridge.First of all,by handling the AHP,the index weights of every risk factor are determinated,and then,correlation analysis are got between the obtained reference data sequence and comparing data sequence by using GRA,The maximum correlation value corresponding standard security level is the safety of the bridge level.Finally,the finite element model is established for the most risk risk factor.Taking Haidan bridge in Yunnan province as an example,the security level of Haidan bridge is evaluated by using a risk assessment model which is established through mixing AHP and GRA together,and to compare the theory with the actual situation,it is proved that the comprehensive method is reasonable and effective,and it can also provide credentials for bridge safety management.Through the risk assessment model,the influences of every risk factors to impact security during the operation of the existing bridge are clear,and then,this paper proposes some relevant risk control measures for the relatively large impact factor.On the one hand,this paper presentes a comprehensive approach for the operational security risk evaluation of the bridge in service,on the other hand,this paper provides some credentials for bridge workers by using this comprehensive evaluation method which can ensure the safe operation of the bridge,this method has important significance for bridge risk assessment.