Study On Intelligent Safety Risk Assessment Grade And Maintenance Measures Of Medium And Small Span Bridges

In recent years,with the vigorous development of highway and bridge construction in China,the number of Bridges also increases year by year,and the structural safety of more and more in-service Bridges has attracted wide attention.At present,there are many hidden safety hazards in the Bridges in many servers in our country,and their carrying capacity can not meet the requirements.Once the structural stability is damaged,it will cause huge economic losses and casualties.This also reflects the importance of how to efficiently carry out bridge safety risk assessment.Because of the large number of bridge diseases at present in the service period,and most of highway Bridges is given priority to with small and medium span Bridges,some small and medium-sized span bridge as the research sample,this article selects main diseases of the bridge type judgment,building the appraisal model of sample set,building intelligence,the development system and a series of work,the level of risk identification and evaluation of Bridges in service,Provide technical support to maintenance management personnel.The research content of this paper mainly consists of the following four parts:(1)Study on the development status of safety risk assessment for in-service Bridges,and clarify the importance and necessity of safety risk assessment for in-service Bridges.Firstly,the diseases of medium and small span Bridges are summarized,and the causes and mechanisms of common diseases are analyzed,which lays a foundation for the analysis of the causes and maintenance suggestions after the evaluation of the existing Bridges.(2)In the stage of risk identification and sample construction,the fuzzy analytic hierarchy process(AHP)was used to construct the fuzzy evaluation index system of safety risk assessment,calculate and reason disease data and construct the sample data set.The probability distribution and distribution function of common diseases are obtained by means of mathematical method,and the rationality of the constructed sample data is checked.(3)build evaluation model of stage,the first analysis of the convolution neural network and expert system to build the model of inspiration,all fusion based on neural network expert system model building the appraisal model of bridge and curing measures analysis model,based on the model parameter setting and training,improve the accuracy of the models for concrete Bridges safety risk evaluation to provide a reliable assessment tools.Based on the characteristics of the research object,the design principle of the system framework is put forward,and the intelligent system framework of bridge safety risk assessment is set up.Matlab2020A is used to develop the safety risk assessment system,and the system interface is constructed to facilitate man-machine interaction and quickly and accurately obtain the bridge safety risk assessment grade and maintenance measures.(4)project,an application example in this paper,through a highway bridge as an example,through the bridge detection,collect testing data,the data pretreatment,the testing data basic situation,Bridges,and other information input to the development of intelligent security risk assessment system interface,the risk level of the small and medium span Bridges and evaluate the maintenance suggestion,According to the evaluation grade of system output,the corresponding causes of disease formation and maintenance and maintenance measures are given.The purpose of this study is to make a more accurate and efficient judgment on the safety risk level of the bridge and provide reasonable maintenance suggestions with the help of the intelligent system,so as to ensure the normal use of the bridge during the operation period without strong technical support from the maintenance personnel.