Research On Health Monitoring System And Damage Identification Of Long-span Cable-stayed Bridge

As China’s economic strength rapidly develops,the number and scale of bridges built throughout the country continue to grow.However,due to weakened performance of bridges themselves or other accidental factors,bridge damage or even collapse can occur.Therefore,in order to ensure safe operation of bridges,large and above bridges often install bridge health monitoring systems,filling the gap of manual inspections.The health monitoring system can automatically monitor the structural condition of the bridge in realtime,and it is important to use the data collected by the system to conduct safety assessments of bridges.This article relies on the Jialing River Bridge in Hongyan Village,Chongqing,and introduces the establishment of a finite element model,the design of a sensor layout plan,and the specific functions of a sensor cloud subsystem.Additionally,using wavelet analysis and time series models,the current state of the cable-stayed bridge is identified for damage recognition.The specific research content is as follows:1 、 An overview summarizes the research status of bridge health monitoring and bridge structure damage recognition,and introduces the basic principles of wavelet analysis and time series analysis,the damage recognition index based on the AR model residual is introduced.2 、 Establishing the finite element model of the cable-stayed bridge,through static and dynamic analysis of the finite element model under various loads,determines the key monitoring parts that affect the safe operation of the bridge,and guides the layout of sensors for various types of parameters.3、Based on the results of the finite element static and dynamic analysis and the design requirements of the bridge health monitoring system,a sensor layout plan that meets the actual monitoring objectives is designed.Various functions of the sensor cloud subsystem are explained,including data collection,processing,management,and health evaluation.Users can view various parameters of the bridge through the network at any time.The sensor layout plan and the sensor cloud subsystem together form the bridge health monitoring system,which can provide actual measurement data for damage recognition.4 、.Through simulation and verification of the finite element model of the cable-stayed bridge,it is shown that the damage recognition index based on the AR model residual can be used to identify the damage of the bridge structure.After denoising the actual measurement data using wavelet analysis,the damage recognition index based on the AR model residual is used for damage recognition.