The Optimal Maintenance Plan Research Of Reinforced Concrete Bridges That Based On The Probability

Along with the progress of the society,the continuous development of bridge.A growing number of professional study the maintenance of the bridge in operation stage.Because of the various uncertain factors,like variability and randomness and so on,the research of the bridge become complicating.As a result of traditional deterministic analysis methods can not consider the uncertainty of actual parameters,the calculation results deviation from the actual situation.The probability-based optimal maintenance of reinforced concrete bridges of the strategic framework is proposed in this paper by combining structural reliability theory,life-cycle cost analysis and maintenance strategies.In this paper,the optimal annual cost and the dual objective genetic algorithm are used to optimize the component and system respectively,and the optimization of different objective functions is discussed for the Bi objective optimization problem.In this paper,the bridge deck,T beam and bridge system based is used optimized by Bi objective genetic algorithm.The main work of this thesis is the development:(1)Describes the research status at home and abroad,this paper puts forward the research direction and content analysis,the component and system reliability based on probability,and use MATLAB to calculate the concrete component and system reliability probability and failure probability based on Monte Carlo method,discussed the different need to limit the impact of state maintenance.(2)Analysis of the bridge in the whole life cycle cost of the operation period,the bridge maintenance is divided into preventive maintenance and necessary maintenance,the preventive maintenance based on maintenance and condition based maintenance,compares the advantages and disadvantages of different maintenance and application,through the analysis of the event tree,build a bridge maintenance event tree model.(3)Based on the optimal annual cost optimization,the calculation formula is simplified,and the influence of different parameters on the optimal annual cost optimization is discussed.(4)According to the concept of the expected failure probability of the proposed concept is expected to total risk based optimization,calculation formula of total expected risk is established,and the use of gamultiobj function in MATLAB optimization toolbox respectively on the component and system of double objectivegenetic algorithm under different objective functions,and makes a comparative analysis.(5)The three components are composed of five different systems,and the relationship between the optimal solutions of different systems under the optimization of the dual objective genetic algorithm is analyzed and compared.(6)The indirect and direct risk risk caused by single component failure,the risk event tree model calculated formula of indirect and direct risk risk analysis,indirect risk different component failure by only a single component in the same system calculation,and indirect risk in different components of the same system.(7)The Bank of Jiangqiao actual engineering case,in consideration of the actual situation in the case of uncertainties on the bridge deck,the bridge T beam and bridge system reliability and failure probability were calculated respectively,and the Bi objective genetic algorithm under different objective functions should be used in the bridge.The optimal solution in the selection of 4 satisfactory solution is analyzed.