Research On Safety Evaluation Method Of Cable-stayed Bridge Based On Long-term Monitoring

In recent years,China's urban transportation network has developed rapidly.As an important basic component of the urban transportation network,bridges have always played a pivotal role in urban extension and social and economic construction.However,in recent years,there have been frequent bridge safety accidents in China.The reason is that the vehicles are overloaded,the supervision is not enough,and the bridge maintenance is not paid attention to.The traditional bridge safety management methods are mainly based on the traditional manual inspection method and rely on the experience of the inspection personnel to judge the results.It is often impossible to discover the structural safety hazards in time,and the judgment results are too dependent on the subjective experience of the inspection personnel.Therefore,it is necessary to make full use of the massive monitoring data collected by the bridge safety monitoring technology to analyze the massive data monitored for a long period of time,and to conduct a safety assessment and grading on the structural safety of the bridge.The analytic hierarchy process is used for the calculation.The safety assessment provides a reasonable plan for the maintenance and repair of the bridge in the later stage.This article takes the bridge structure safety monitoring technology as the technical basis and the safety monitoring data collected by the sensors.In this paper,the main research directions are the analysis and processing of massive safety monitoring data,the reasonable placement of sensors,the identification and processing of distortion data,and the bridge safety assessment method.The actual engineering background is the Hefei City Fanhua Avenue across the Nanfeihe cable-stayed bridge.Study the safety assessment method of cable-stayed bridge based on long-term monitoring.This article first uses the bridge structure analysis software Midas Civil to model and analyze the Nanfeihe Bridge,and combines the structural characteristics of the actual bridge with the calculation results of the structural analysis model to provide a reasonable and effective method for the placement of sensors in the subsequent work.Suggestions.Afterwards,the article lays out the bridge safety monitoring sensors in detail,and puts forward the building component of the software system platform of the bridge safety monitoring method.Among them,the software system platform mainly includes a monitoring module,a reference station module,a data center module(cloud platform),and has functions such as real-time monitoring,data collection and transmission,and securityassessment.Secondly,in this paper,in view of the problems existing in the analysis and processing of the previous massive monitoring data,the data distortion of the monitoring data is identified and processed.Identify and process the distorted data according to the characteristics of different types of monitoring data distortion.The data distortion includes three types: single-point data distortion,continuous distortion of continuous data,and missing data of continuous data.And for three different types of distortion,corresponding identification methods and solutions are proposed.Finally,based on the comprehensive analysis of various monitoring indicators in the overall structure of the bridge,this paper carried out the structural hierarchy division of the Nanfeihe Bridge,and the analytic hierarchy process was adopted in the division of the hierarchy.First of all,the analytic hierarchy model of the bridge safety assessment of Nanfeihe Bridge is first established,and then the corresponding weights of different indicators are determined according to the established analysis model,or the weights of different locations of the same indicator are determined by the limit reserve method.Finally,through the lowest level of rating,starting from the lowest level and grading upward,the grading of the overall structure of the bridge is obtained.After learning the rating,provide and adopt corresponding maintenance methods,so that the bridge structure can be safely and comprehensively maintained.Figure [40] table [10] reference [105]...