Study On Risk Management Of Construction Period To Expressway Bridge

With the accelerated process of urbanization in China,the projects of bridge construction also developing rapidly in our country.For a city,the bridge as a city municipal facilities play a crucial role to ease traffic congestion and facilitate the public travel.However,with the construction of bridges project have launched,more and more accidents occurred in the construction process,and resulted in significant property losses,casualties and the social impact is very bad.Therefore,it is necessary to carry out the risk assessment of the bridge construction period to reduce the probability of accidents.In this paper,the risk assessment of bridge construction period under complex environmental conditions is studied.The following studies are carried out:1.This paper analyzes the theory of risk assessment of bridge construction period,summarizes its concept,characteristics and principles,and explains the classification of risk factors during bridge construction period from the aspects of bridge structure,construction and environmental conditions.2.This paper analyzes the risk assessment methods which is applicable to the construction of bridge engineering,focuses on the analytic hierarchy process(AHP)and the accelerated genetic algorithm(AGA),and points out the shortcomings of these two methods.For example,the AHP method is complicated and computationally large,AGA method is convergence slow and poor accuracy and so on.Finally,this paper presents a risk assessment model for bridge construction period combined with AGA,AHP and fuzzy mathematics theory.To minimize the interference of the human subjective factors throughout the risk assessment process,so that the assessment results are more scientific and accurate,and minimize the probability of risk accidents.3.In this paper,we will evaluate the risk of the A project use the assessment model which we proposed.The evaluation results are of high scientificity and accuracy,which indicates that the proposed model in this paper can carry out scientific and reasonable risk assessment of the bridge construction period,and provide the correct risk reference basis for the participants.The method has high practicability.