数字摄影技术监测桥梁震动变形的研究

Research of bridge vibration deformation monitoring with digital close-range photogrammetry

针对传统测量方法的缺陷,采用数字摄影技术对震动状态下的桥梁进行变形监测。首先选择人工标志,布设控制点和变形监测点,其次用消除了畸变差的数码相机在动荷载的作用下,对桥梁进行瞬间的抓拍,得到一系列荷载的照片,最后用编制的三维时间基线视差法软件进行数据的处理和图形的显示。结果表明,该技术操作方便,精度高,能同时对多个观测点进行观测并获取桥梁的瞬间变形值,监测精度达到3/1 000。

We apply digital photogrammetry to deformation observation of bridge vibration.for the negatives of traditional measurement methods. We initially chose artificial marks, and deployed control points and deformation monitoring points. We then instantly captured the bridge and acquired the photos of a series of loads with a distortion eliminated digital camera under moving loads, We eventually performed data processing and graphics display with a 3D time baseline parallax method software. Results show that the approach is convenient and highly precise. It can also observe multiple points instantaneously and acquire bridge instantaneous deformation value with the accuracy of 3/1 000.