基于三维激光扫描技术的桥塔挠度测量

Pylon Deflection Monitoring Based on Terrestrial Laser Scanning

现有的单点式挠度测量需要安装目标点,由于点数少,难以全面给出大型物体的变形。地面三维激光扫描技术采用了无接触式的测量方式,可以在短时间内获取物体表面高精度和高密度的三维坐标。将该技术应用到桥塔挠度监测方面,针对桥塔特点,提取桥塔棱线处的点云,通过去噪、拟合等处理方法,获取在不同荷载情况下整体桥塔的挠度变化,并进行对比分析。试验证明了该方法在桥塔挠度测量中的可行性。

The existent deflection survey about single-pointmode cannot describe the whole deformation of large object because there are only a few points.Terrestrial laser scanning technology can obtain vast amounts of 3Dcoordinates on the object surface with high-precision and high-speed.This paper applies it in the pylon deflection monitoring.Against the characteristics of pylon,the point cloud near the ridge lines is extracted.By de-noising and data fitting process,the deflection change of the pylon under different loadings is achieved,compared and analyzed.The feasibility of this method in pylon deflection measurement is verified through experiment.