Study On The Evaluation Method Of Real-time Monitoring And Artificial Detection Of Medium And Small Bridge

At present,small and medium-sized bridges are mainly based on traditional artificial detection.It is difficult to judge the bridge accurately.The small and medium-sized bridges with state monitoring system are mainly monitored by key positions.The monitoring contents are not perfect and the evaluation methods are relatively lack of,for their own shortcomings,how to combine the two on the bridge to accurately assess the status of the current academic research is a very important issue.In this paper,based on the MATLAB software to compile the relevant procedures,the state monitoring data pretreatment and analysis,to achieve the engineering example of monitoring data temperature,shrinkage creep and vehicle load effect separation,in order to excavate the dead load situation bridge structure response information.According to the manual inspection data,the results of the monitoring data analysis are verified,and the operation status of the bridge is evaluated.The main contents of this paper are as follows:(1)Firstly,the background,development status and existing bridge evaluation theory of bridge condition monitoring are briefly introduced.The theory of real-time monitoring data preprocessing and analysis method is expounded.(2)Brief introduction of the requirements,program design principles,monitoring the location selection and monitoring content to the small and medium-sized bridge condition monitoring system;This article relies on the project to monitor the project in the monitoring of each piece of paper placed a strain sensor,two beams arranged Deflection sensor,three beams arranged a crack monitoring sensor,each sensor comes with temperature monitoring,monitoring the monitoring period in the normal operation of the system.(3)The data pretreatment and analysis method are used to deal with the strain and deflection monitoring data,and the information of strain and deflection under zero live load is obtained,and the characteristic information is analyzed and statistically analyzed.The results show that the deflection of the main beam of the bridge is stable at the theoretical value of 1/60 ~ 1/40,and there is no obvious change trend.The strain of the two beams is negative,Value of 1/60 ~ 1/8,and there are varying degrees of slow down the trend.(4)Analysis of crack monitoring data,the maximum width of cracks does not exceed the limits given by the specification,the relationship between the width of cracks and the existence of temperature and inclination,and the variation of crack width is very small under constant load and live load.(5)Compared with the monitoring time before and after the manual inspection data,the bridge in the two tests in the disease results roughly the same,the bridge did not occur significant damage;according to the bridge linear analysis results,crack monitoring data on the deflection,strain monitoring data analysis results to verify and monitor.The test results are in good agreement with the results of the monitoring data analysis.(6)Based on the AHP method in the conservation specification,the bridge is rated according to the monitoring data and the manual inspection data.The overall technical condition index BCI = 86.95,the technical condition level is B grade and the good condition;in the current bridge operation condition,The stiffness and crack width of the bridge can meet the current bearing conditions,but the trend of increasing cracks should be given enough attention and take measures to repair.