Study on monitoring method of long-span bridge deformation based on three-dimensional laser scanning
The three-dimensional laser scanning technology has been applied to the 3D reconstruction of structures in its development,and three-dimensional point cloud has become an important basic data of structural deformation monitoring.Measuring the three dimensions of a target surface,the ground-based three-dimensional laser scanning system can display the spatial form of a structural surface and record the coordinate information of the point location in the form of array point cloud.It overcomes the shortcomings of the traditional single point measurement method,such as limited number of sampling points and small coverage area,and quickly measures the whole of the observed object with high precision.In this paper,the ground three-dimensional laser scanning technique is applied to overall deformation monitoring of long-span bridges.Our research target is a long-span steel truss arch bridge with the main span of 432m,whose high-temperature deformation is monitored by using the three-dimensional laser scanning technique.Under the condition of daily temperature difference of 9 oC,the three dimensions of the bridge is scanned by laser twice,and the collected data is processed.A new deformation measurement method for bridge NURBS surface based on 3D point cloud data is proposed,and the overall deformation measurement result of the bridge is obtained.According to the data comparison results of the precision level and the total station,the deformation measurement values obtained by the three-dimensional laser scanning system and the data processing method proposed in this paper have good accuracy and reliability.This method can obtain point-line-plane overall deformation monitoring results of the bridge.Compared with the traditional single point deformation monitoring,our method has an extra demonstration of linear deformation and overall deformation characteristics,and has good prospect in engineering application.
3D Laser Scanning Deformation Monitoring Point Cloud Precision NURBS Surfaces
Chu Xi Zhou Zhixiang Deng Guojun Tang Liang
Department of State Key Laboratory Breeding Base of Mountain Bridge Tunnel Engineering,Chongqing Jiaotong University,Chongqing,China
国际会议
The 7th World Conference on Structural Control and Monitoring(7WCSCM)(第七届结构控制与监测世界大会)
青岛
英文
2313-2326
2018-07-22（万方平台首次上网日期，不代表论文的发表时间）