This paper applies the 3D ground laser scanning technique to monitor the high-temperature deformation of a long-span steel truss arch bridge, whose main span is 432m in length. Under the daily temperature difference of 9ºC, the three dimensions of the bridge was scanned twice by laser, and the collected data was pre-processed for further analysis. After that, a new deformation measurement method for the non-uniform rational basis spline (NURBS) surface was put forward based on 3D point cloud data, and adopted to measure the overall deformation of the said bridge. The measured results were compared to those captured by the precision level and the total station, indicating that the proposed 3D laser scanning system and data processing method enjoy good accuracy and reliability. Compared with the traditional single-point deformation monitoring methods, our method can record the linear deformation and present the overall deformation features. The proposed method boasts good prospects in engineering application.
deformation monitoring, ground-based 3D, laser scanning, nurbs surfaces, point cloud precision
This paper was supported by the National Nature Science Foundation of China (51778094, 51708068).
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