激光测量法在大跨径桥梁静态检测中的应用.pdf

第十一届全国实验力学学术会议 大连 2005 激光测量法在大跨径桥梁静态检测中的应用 廖东斌，顾成军，姜益军，黄跃平，董萼良 （东南大学 工程力学系，南京210096） 摘 要 ：本文主要研究激光测量大跨径桥梁挠度和转角的测量法。激光测量法利用激光良好的 方向性,将桥梁测点的位移（挠度和转角）,转化为激光光斑中心的位置改变。通过高像素数码 相机记录光斑图像，并用相关软件转化为灰度图像，利用灰度重心法和数字图像相关技术处理 灰度图像，获得桥梁测点位移。数字图像相关技术的应用使挠度测量精度较高。通过在润扬大 桥的现场测试表明，激光测量法测量精度较高,对测试环境要求低，测试时间短，测试成本低。 用激光作为位移信息载体,实现了远距离测量,在保证较高测量精度的基础上实现了大范围的挠 度测量。该方法可推广应用于大跨径桥梁的实测中。 关键词：激光；数码相机；挠度与转角测量；数字图像相关 Application of Laser Measurement in Large Span Bridge Stacis Survey (Dongbin Liao, Chengjun Gu, Yijun Jiang, Yueping Huang, ELDong) (Department of Mechanics,Southeast University,Nanjing 210096,China) Abstract: This study aims at deflection and slope measurement based on laser in large span bridge. The measurement based on laser applies fine direction of laser and transforms deflection and slope into displacement change of laser speckle center. After recording laser speckle image by high pixel digital camera, avert laser speckle image to gray image. Gray center of gravity method and digital image correlation method apply to treatment of gray image in order to acquire survey displacement .As the analysis of laser speckle image adopt on digital image correlation method , the measure precision of deflection and slope is upper. The test results in the Runyang Bridge demonstrate that the laser measurement has high measure precision, and has lower test environment demand, and need a little test time and lower cost price. laser as displacement information carrier can realize distant distance survey and large range deflection measurement on precondition of high precision. The meth