数字近景摄影测量在桥梁变形观测中的应用

The Application of Digital Close-Range Photogrammetry in the Deformation Observation of Bridge

针对传统的变形监测手段的不足,采用数字近景摄影测量对动态桥梁进行瞬间实时变形监测。首先布设人工标志的参考点和变形点,其次用经过直接线性变换法检定的数码相机对动态桥梁进行瞬间的抓拍,获取承载变形信息的照片,最后根据空间时间基线视差法,对采集的数据进行处理,并将结果以图形的形式展现出来。数据表明,利用数字近景摄影测量对动态桥梁结构进行变形监测,易操作,能同时获取多个观测点的瞬间变形信息,成果精度达到3/1 000.对桥梁的变形监测研究具有重要的参考价值。

In the light of the shortcomings of traditional monitoring methods of the de- formation observation, this paper adopts digital close-range photogrammetry for the deform- ation observation of the bridge in the dynamic real-time moments： at the first, laying the ref- erence points and the deformation points with the artificial marks, then, using the digital cameras verified with the direct linear transformation method to capture the dynamic bridge at the moment and obtain the pictures which bears deformation information, at last, accord- ing to the space time baseline parallax method, processing the collected data, and showing out the results graphically. Data shows that： using digital close-range photogrammetry to observe the deformation of the dynamic bridge structure is easy to operate and can also obtain the deformation information of a number of observation points in the blink of an eye, the ac- curacy of the results reached 3/1000. The study has important reference value for the de- formation observation of the bridge.