Observing Bridge Dynamic Deflection in Green Time by Information Technology

2017 3rd International Conference on Environmental Science and Material Application

生态环境科学;材料科学

Yu, Chengxin^1 ; Zhang, Guojian^2 ; Zhao, Yongqian^1 ; Chen, Mingzhi^1

Business School, Shandong Jianzhu University, Jinan

250101, China^1

School of Environmental Science and Spatial Informatics, China University of Mining and Technology, Xuzhou

221116, China^2

关键词: Bridge deflection;    Bridge dynamics;    Bridge structures;    Control point;    Data support;    Deformation point;    Measurement accuracy;    Tolerance values;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/108/2/022064/pdf
DOI  :  10.1088/1755-1315/108/2/022064

来源: IOP

【 摘 要 】

As traditional surveying methods are limited to observe bridge dynamic deflection; information technology is adopted to observe bridge dynamic deflection in Green time. Information technology used in this study means that we use digital cameras to photograph the bridge in red time as a zero image. Then, a series of successive images are photographed in green time. Deformation point targets are identified and located by Hough transform. With reference to the control points, the deformation values of these deformation points are obtained by differencing the successive images with a zero image, respectively. Results show that the average measurement accuracies of C0 are 0.46 pixels, 0.51 pixels and 0.74 pixels in X, Z and comprehensive direction. The average measurement accuracies of C1 are 0.43 pixels, 0.43 pixels and 0.67 pixels in X, Z and comprehensive direction in these tests. The maximal bridge deflection is 44.16mm, which is less than 75mm (Bridge deflection tolerance value). Information technology in this paper can monitor bridge dynamic deflection and depict deflection trend curves of the bridge in real time. It can provide data support for the site decisions to the bridge structure safety.