The Design Optimization Of The Bridge Based On Risk Analysis

With fast development of bridge construction,bridge construction accidents and operational safety accidents frequently occurred,which put serious threats to the safety and durability of the bridge.How to improve bridge designing,quality of construction,efficiency of management and maintenance is becoming an urgent problem which needs to be solved immediately.In recent years,to analyze and dispose the risks of bridge engineering with the application of risk assessment and the theory of risk management tends to be a creative solution.This thesis takes the bridge Kekeyare and hydropower station bridge G314 line as an example to make bridge engineering life analysis and risk evaluation with the purpose of pursuing countermeasures to safety risks existed in design,construction,and operation of bridge engineering,and optimization of feasible bridge scheme.This thesis will study the following aspects:(1)Risk analysis of bridge structure.Firstly,this method obtains risk resource ratio through applying the expert investigating methods to analyze the risk source exited in the structure scheme of continuous girder bridges and steel structure bridges;Secondly,according to bridge project risk evaluation criteria,the method will evaluate the risk of two kinds of bridge structure with the application of analytic hierarchy process(ahp)in order to obtain risk grading and guidance to bridge structure design.(2)Risk analysis of the construction.First,it explains the basic theory of the bridge construction risk assessment;Second,it investigates and identifies bridge construction risk source;Thirdly,it establishes the system of risk assessment,risk assessment criteria,and hierarchy analysis model and then studies the evaluation content and processes;Finally,it makes the comprehensive analysis of risks exited in construction condition and the construction phases.(3)Risk analysis of operation stage.In this part,it will build a analytical model which includes aspects of bad weather,road safety,durability,and the overload operation etc,to get the project risk level through the analysis;it also evaluates the general bridge operational risk and bridge structure durability.(4)Comprehensive analysis of engineering life cycle risk.On the basis of theory research and application analysis,the paper concludes a comprehensive analysis and evaluation of bridge engineering samples,and formulates the corresponding risk control measures,optimizes design,and provides reference for the implementation of the bridge project.Researching results show that the two bridge engineering project risk level are conditional,and relatively continuous girder bridge is better.But two types of bridges are required further implementation of the preventive measures in order to enhance security.In short,this paper thoroughly studies the expert survey-hierarchical analysis risk assessment theory,in view of the bridge,construction,operation and so on the whole life cycle risk assessment,the establishment of a unified assessment criteria system,respectively,chromatography analysis model is established,and the subject bridge engineering design scheme is optimized,to improve the engineering has strong guiding significance to the construction and operation safety,and the analysis provides certain reference for similar projects.