Analysis of bridge deflection deformation based on ground three-dimensional laser scanning

doi:10.13474/j.cnki.11-2246.2022.0148

Abstract

Abstract: Traditional methods of bridge deformation monitoring usually depend on deformation data of several independent points, which has the problems of low automation degree, low efficiency and limitations. In this article, an accurate method for bridge deflection is proposed. This method accurately registers the point cloud data of the bridge obtained by the ground 3D laser scanner. On the basis of obtaining reliable point cloud data, the bridge alignment is obtained by using the sliding window method, and the deflection of the bridge are obtained by using the difference analysis of two periods of data. Taking a continuous rigid frame bridge with a span of (40 m+65 m+40 m) as the experimental object, it is found that there are deflection deformations with a minimum value of 8 mm, a maximum value of 17.5 mm and an average value of 14.9 mm. Results prove that the method is simple and practical, with strict theory, high computational efficiency. It has important reference significance for the deep application of 3D laser scanning technology in the field of deformation monitoring.

Key words: bridge health monitoring, deflection, ground three-dimensional laser scanning, point cloud, sliding window

CLC Number:

P258

ZHAO Lidu, XIANG Zhongfu, ZHOU Yin, MA Xiaping, ZHANG Shuangcheng, SI Mengyuan, CHEN Maolin, HU Chuan, PAN Jianping. Analysis of bridge deflection deformation based on ground three-dimensional laser scanning[J]. Bulletin of Surveying and Mapping, 2022, 0(5): 95-100.

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