三维激光扫描灰度信息在结构变形场计算中的应用

发布时间：2018-04-27 17:55

本文选题：激光扫描 + 灰度　；参考：《建筑结构学报》2017年03期

【摘要】：非接触测量技术是结构测量领域的最新进展之一,这类测量方法无需在被测对象上安装传感器,因而在结构试验以及土木工程现场实测中具有一定的优势。三维激光扫描作为一种非接触测量新技术,可以直接获取目标物表面点密集的三维坐标和灰度值,受测试环境干扰小,因而在土木工程领域的应用日益受到关注。在激光扫描技术的基础上,提出一种同名点的匹配方法,以提高变形场计算的精度。这种方法利用激光扫描的灰度信息,对扫描得到的点云坐标和灰度数据进行像素化处理,然后用相关系数法确定同名点并计算位移场。通过一钢梁试验对该方法进行验证,将结果与导杆位移计以及有限元分析的结果作了比对,结果显示该方法可以提高同名点识别的精度,进而提高结构变形计算的准确性,且可以同时获得构件包括平面内和平面外的变形。
[Abstract]:Non-contact measurement technology is one of the latest developments in the field of structural measurement. This kind of measurement method does not need to install sensors on the object under test, so it has certain advantages in structural test and field measurement of civil engineering. As a new non-contact measurement technique, 3D laser scanning can directly obtain the 3D coordinate and gray value of the object surface, which is less disturbed by the testing environment, so the application of 3D laser scanning in civil engineering has been paid more and more attention. On the basis of laser scanning technique, a matching method of points of the same name is proposed to improve the accuracy of deformation field calculation. Based on the grayscale information of laser scanning, the point cloud coordinates and grayscale data obtained from laser scanning are processed by pixel processing, and then the points of the same name are determined by correlation coefficient method and the displacement field is calculated. The method is verified by a steel beam test, and the results are compared with the results of the guide rod displacement meter and the finite element analysis. The results show that the method can improve the accuracy of the identification of the same name points and further improve the accuracy of the deformation calculation of the structure. At the same time, the deformation of the component can be obtained, both in and out of the plane.
【作者单位】：同济大学土木工程防灾国家重点实验室;成都理工大学地质灾害防治与地质环境保护国家重点实验室;
【基金】：国家自然科学基金项目(51208382) 上海科委国际合作项目(16510711300) 地质灾害防治与地质环境保护国家重点实验室开放基金项目(SKLGP2016K006)
【分类号】：TU317

【相似文献】