Research On Three-dimensional Laser Scanning Technology In Bridge Deformation Monitoring

With the agile development of advanced science and technology, three-dimensional (3D) laser scanning technology, a new laser technology, applied in various fields, is referred to another technological revolution following the GPS technology in the field of engineering application. Bridge deformation monitoring, acting an critical role in structural health monitoring, is one of the effective means to protect bridges in service. Feasibility research on3D laser scanning technology applied in bridge deformation monitoring, and the technology promotion in the field of structural deformation monitoring are of great practical significance. In order to protect property of the state as well as people, improving the operation efficiency of engineering structures is of great significance.In this paper,3D laser scanner-Leica ScanStation2-is used to scan the bridge periodically. It is proposed that based on no initial parameters of feature lines model difference is done so that the continuous quantization deformation is along feature line. Use Cyclone initial processing point cloud data, and extract continuous feature data of the various parts of bridge. The data curve fitting creates a two-dimensional model. A model given as a reference model, difference function of each period is obtained. Using MATLAB to convert difference function to graph in which deformation along bridge with various periods is obvious, contributes to analyzing the deformation status of the overall bridge. And the model formed with the tradition measured historical data was compared with that one. Exploring the feasibility of3D laser scanning technology in the bridge deformation monitoring is effective. The main work and achievements are as follows:(1) Details in the principle, system configuration and application of3D laser scanning technology;(2) Details in current bridge health monitoring techniques, methods and monitoring content;(3) Exploration of data acquisition program for the3D laser scanner, a series of data processing methods and precautions based on Cyclone software;(4) Exploration of data error handling measures, model comparison method and feature data extraction as well as fitting; quantization deformation expression with MATLAB and the analysis of the traditional historical monitoring data;(5) This article aims to an arch bridge structure, the large bridge structures of other types need to further study. The data accuracy in certain circumstances needs to be improved in order to achieve more accurate monitoring and broaden the application areas.