Monitoring Dynamic Deflection Deformation of a Bridge by Digital Photography

2018 5th International Conference on Advanced Composite Materials and Manufacturing Engineering

Wu, Liyuan^1 ; Zhao, Tonglong^1 ; Yu, Chengxin^2

Colledge of Surveying and Geo-informatics, Shandong Jianzhu University, Jinan

250101, China^1

Shandong Jianzhu University, Jinan

250101, China^2

关键词: Bridge deflection;    Deformation point;    Digital photogrammetry;    Digital photography;    Dynamic deflections;    Maximum deflection;    Photographic scale;    Reference points;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/394/3/032090/pdf
DOI  :  10.1088/1757-899X/394/3/032090

来源: IOP

【 摘 要 】

In order to make up the deficiency for traditional surveying method in monitoring bridge dynamic deformation in real time, in this paper, we propose the method of IM-PST (image matching-photographic scale transformation) method based on digital photogrammetry: the observation stations (cameras) were set at appropriate location. The reference plane formed by the reference points, were 2.6-meters away from the camera and deformation points were set on the bridge. In real time the bridge deflections were obtained through transforming the pixel changes on the image plane of deformation points based on the IM-PST method. Results show that the maximum deflection of the bridge is 3.472mm and 4.980mm in the upward and downward respectively. And both of them are within the allowable deflection of the bridge (L/1000, L is the bridge span). Thus, the Caiyuan Bridge is in good operation.The IM-PST system can make a safety warning for the bridge in real time and provide data support to repair the bridge.