基于NURBS曲面叠差分析的桥面变形监测方法
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摘要
将车载三维激光技术引入到桥梁整体变形监测中,以主跨432 m的特大跨钢桁架上承式拱桥为背景,采用三维激光扫描技术对其进行温度变形研究,并对采集的数据进行处理。对基于车载三维激光扫描点云数据的NURBS曲面提出了一种新的变形测量方法,得到整个桥面的变形测量结果,再与水准仪的测量结果进行比较。结果表明,基于NURBS曲面的分析处理方法获得的变形测量值具有良好的精度和可靠性。该方法与现有的单点监测相比,弥补了其缺乏线性变形以及整体变形特性不足,有较好的应用前景。
Vehicle 3 D laser technology is introduced into the overall deformation monitoring of the bridge. Taking the super long span steel truss overhead arch bridge with a main span of 432 meters as the background,3D laser scanning technology is applied to study the temperature deformation. At different temperatures,the 3D laser scanning is carried out on the vehicle,and the data collected are processed. For the NURBS surface obtained by 3D laser scanning point cloud data,a new method is presented to measure the deformation of whole bridge,and then the measurement results are compared with the data of level instrument. The results show that deformation measurement analysis method based on NURBS surface value has high accuracy and good reliability. Compared with the existing single point monitoring method,this method makes up for its lack of linear deformation and the lack of overall deformation characteristics,and has a good application prospect.
Vehicle 3 D laser technology is introduced into the overall deformation monitoring of the bridge. Taking the super long span steel truss overhead arch bridge with a main span of 432 meters as the background,3D laser scanning technology is applied to study the temperature deformation. At different temperatures,the 3D laser scanning is carried out on the vehicle,and the data collected are processed. For the NURBS surface obtained by 3D laser scanning point cloud data,a new method is presented to measure the deformation of whole bridge,and then the measurement results are compared with the data of level instrument. The results show that deformation measurement analysis method based on NURBS surface value has high accuracy and good reliability. Compared with the existing single point monitoring method,this method makes up for its lack of linear deformation and the lack of overall deformation characteristics,and has a good application prospect.
引文
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[3]陈弘奕,胡晓斌,李崇瑞.地面三维激光扫描技术在变形监测中的应用[J].测绘通报,2014(12):74-77.
[4]何原荣,郑渊茂,潘火平,等.基于点云数据的复杂建筑体真三维建模与应用[J].遥感技术与应用,2016,31(6):1091-1099.
[5]李珵,卢小平,朱宁宁.三维激光扫描隧道断面形变监测精度验证[J].测绘通报,2013(S1):69-72.
[6]刘增良,周庆,韩友美,等.车载激光扫描在城市大型立交桥三维建模中的应用[J].北京测绘,2016(4):4.
[7]王红霞.三维激光扫描技术在桥梁监测中的应用[D].兰州:兰州理工大学,2012.
[8] Riveiro B,Morer P,Arias P,et al. Terrestrial laser scanning and limit analysis of masonry arch bridges[J]. Construction&Building Materials,2011,25(4):1726-1735.
[9] Soni A,Robson S,Gleeson B. Structural monitoring for the rail industry using conventional survey, laser scanning and photogrammetry[J]. Applied Geomatics,2015,7(2):123-138.
[10]陈红权,郭威.三维激光扫描技术在桥梁形变监测中的应用[J].现代测绘,2016(1):36-39.
[11] Nassar S. Improving the Inertial Navigation System(INS)Error Model for INS and INS/DGPS Applications(Doctorate Dissertation)[D]. Calgary:University of Calgary,2003.
[12]陈鑫,王李管.采空区单站激光等距扫描与高效三维重建方法[J].中国矿业大学学报,2016,45(4):836-842.
[13] Bergstr9m P. Evaluation of NURBS Surfaces for Regular Structured Parameter Values[J]. Journal of Computing&Information Science in Engineering,2016,15(1):011005.
[14]刘春明,方漪.寻找三维散乱数据点拓扑结构的一种算法[J].青岛大学学报(工程技术版),2003(3):20-24.
[15]黄承亮.激光扫描技术下桥梁变形监测方法的研究[J].测绘通报,2015(S0):206-209.
[16]姜腾蛟,唐亮,周志祥,等.近景摄影三维重建在结构试验中的应用[J].实验室研究与探索,2016,35(12):93-95.