LiDAR非接触测量技术在钢结构轴压稳定试验中的应用

Application of Scanning LiDAR for Steel Column Axial Compression Testing Measurement

激光雷达(LiDAR)作为一种非接触测量技术,在实验室试验和结构现场实测领域有广阔的应用前景。文章利用一套高精度LiDAR系统,基于坐标转换以及点云去噪、拟合技术,获得了钢结构轴压稳定试验中构件变形曲线;并在此基础上,根据力学分析进一步反演了构件应变分布和试验施加的外荷载。试验同时采用常规的位移计、应变片、荷重传感器测量了构件变形、应变、力,与LiDAR测量结果进行了对比。研究表明,基于激光扫描的测量技术可以实现结构构件变形、应变的整体测量,相对于传统单点测量方式具有一定的优势。

Scanning LiDAR, as one of non-contact sensing technologies, has a great potential in structural laboratory and field testing measurement. A commercially available LiDAR scanner was used in this study to obtain the deformation curve of a steel column under axial compression loading. Methods for coordinate transformation, point cloud noise filtering, and curve fitting were developed. Strain distribution and applied force were also derived based on LiDAR measurements. The deformation, strain, and force calculated from the proposed LiDAR-based method were compared with the direct measurements obtained from typical displacement transducers, strain gages, and a loading cell. These contact sensors were mounted on the steel column during lab testing. It is indicated that the proposed technique developed based on LiDAR scan is capable of measuring deformation and strain of a structural member globally and it shows great advantages over traditional contact single-point measurement methods.