Application And Analysis Of GNSS In Surface Displacement Monitoring Around Bridges

With the increasingly developed traffic construction in China,many Bridges have been built all over the country,especially in mountainous areas,across rivers and across rivers.The consequent problem is the maintenance of so many Bridges.With the development of surveying and mapping science and technology,more and more technologies are used for bridge deformation monitoring.Automatic bridge monitoring is also very important,which can reduce a lot of monitoring workload.With the continuous development of GNSS positioning technology and the improvement of measurement accuracy,many Bridges adopt GNSS technology for deformation monitoring and have been successfully applied.GNSS positioning technology is characterized by high precision,all-weather,high efficiency,multi-function,easy operation and wide application.Therefore,it is widely used in measurement and is often used in control measurement and automatic monitoring tasks.In this paper,the related problems of GNSS applied to the surface displacement around the bridge are studied,aiming at the related deformation monitoring problems of the bridge.In the research process,firstly,the application status of GNSS in bridge deformation monitoring at home and abroad was understood by collecting relevant data and consulting relevant literatures.On this basis,the significance and content of the research were proposed.Then,the paper analyzes the main causes of bridge deformation and the relevant monitoring content of the bridge,and briefly introduces some new technologies and methods of surface displacement around the bridge by referring to the data.Then,combined with GNSS monitoring principle and error analysis,regression analysis was selected to analyze GNSS monitoring results according to the acquired GNSS monitoring data.Then,according to engineering examples,Python is used to realize the preprocessing and regression analysis of GNSS monitoring data.Finally,the results of regression analysis are analyzed to draw research conclusions.The main research conclusions of this paper are as follows:1.GNSS monitoring technology is applied in practical engineering cases.According to THE RESULTS of GNSS monitoring data,GNSS monitoring technology can be applied in the surface displacement around the bridge,and the results are relatively accurate;2.The linear regression,local weighted regression and polynomial regression studied in this paper can be applied to the analysis of GNSS monitoring data;3.Combined with the application of GNSS surface displacement monitoring example of a bridge on Yaxi Expressway in Sichuan.By monadic linear regression and partial weighted regression and cubic polynomial regression comparing with the results of the three methods of regression analysis,found in the cubic polynomial regression data,the optimal fitting effect,locally weighted regression times,monadic linear regression of the worst,just in general can be a good application and can reflect the deformation trend.