基于三维扫描点云数据的模型桥形变获取  

Acquisition of Model Bridge Deformation Based on Three-dimensional Scanning Point Cloud Data

作　　者：冯麟 周志祥 唐亮[1] 张鑫[1] 于辉 FENG Lin;ZHOU Zhixiang;TANG Liang;ZHANG Xin;YU Hui(School of Civil Engineering,Chongqing Jiaotong University,Chongqing 400074,China;State Key Laboratory of Mountain Bridge and Tunnel Engineering,Chongqing 400074,China;College of Civil and Transportation Engineering,Shenzhen University,Shenzhen 518060,Guangdong,China)

机构地区：[1]重庆交通大学土木工程学院,重庆400074 [2]山区桥梁及隧道工程国家重点实验,重庆400074 [3]深圳大学土木与交通工程学院,广东深圳518060

出　　处：《实验室研究与探索》2021年第8期5-8,18,共5页Research and Exploration In Laboratory

基　　金：国家自然科学青年基金项目(51708068);国家自然科学基金项目(51778094);重庆交通大学研究生教育创新基金项目(2020S0006)。

摘　　要：为了利用三维激光扫描点云数据实时获取桥面形变值,针对一座有机玻璃模型桥依次开展了无损及有损工况下不同等级荷载的试验研究。利用徕卡Nova Ms50三维激光扫描仪获取不同工况下模型桥点云数据后,结合K近邻自适应双边滤波算法与Geomagic Qualify中的3D叠差功能获取了试验桥桥面挠度云图。结果表明:基于三维激光扫描点云数据基本可实现桥面所有点的形变测量,对应形变测量值可表征多种荷载工况下结构挠度变化,相较于传统位移测量技术,该方法测量最大误差为13.3%,基本满足工程测量要求,从而为桥梁结构的形变值获取提供了一种新途径。In order to obtain the real-time deformation value of bridge deck by using 3D laser scanning point cloud data,an experimental study on a plexiglass model bridge under different levels of loads under non-destructive and damage conditions was carried out successively.After obtaining the point cloud data of the model bridge under different conditions by using the Nova Ms503D laser scanner in Leica,the bridge deck deflection nephogram of the test bridge was obtained by combining the K-nearest neighbor adaptive bilateral filtering algorithm and the 3D stacking function in Geomagic Qualify.The results show that the deformation measurement of all points of the bridge deck can be basically realized based on the 3D laser scanning point cloud data,and the corresponding deformation measurement value can characterize the structural deflection change under various load conditions.Compared with the traditional displacement measurement technology,the maximum error of this method is 13.3%,which basically meets the requirement of engineering measurement,thus providing a new way for obtaining the deformation value of bridge structure.

关 键 词：三维激光扫描 点云数据 K近邻 双边滤波 模型桥 形变值 

分 类 号：TU317[建筑科学—结构工程]