Exploring of PST-TBPM in Monitoring Bridge Dynamic Deflection in Vibration

2017 3rd International Conference on Environmental Science and Material Application

生态环境科学;材料科学

Zhang, Guojian^1 ; Liu, Shengzhen^2 ; Zhao, Tonglong^3 ; Yu, Chengxin^4

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

221116, China^1

First Geodetic Surveying Team of the National Geographic Information Bureau, Xi'an

710054, China^2

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

250101, China^3

Business School, Shandong Jianzhu University, Jinan

250101, China^4

关键词: Bridge dynamics;    Deformation trend;    Digital photography;    Maximal deflection;    Measurement accuracy;    Parallax methods;    Reference systems;    Scale transformation;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/108/2/022045/pdf
DOI  :  10.1088/1755-1315/108/2/022045

来源: IOP

【 摘 要 】

This study adopts digital photography to monitor bridge dynamic deflection in vibration. Digital photography used in this study is based on PST-TBPM (photographing scale transformation-time baseline parallax method). Firstly, a digital camera is used to monitor the bridge in static as a zero image. Then, the digital camera is used to monitor the bridge in vibration every three seconds as the successive images. Based on the reference system, PST-TBPM is used to calculate the images to obtain the bridge dynamic deflection in vibration. Results show that the average measurement accuracies are 0.615 pixels and 0.79 pixels in X and Z direction. The maximal deflection of the bridge is 7.14 pixels. PST-TBPM is valid in solving the problem-the photographing direction not perpendicular to the bridge. Digital photography used in this study can assess the bridge health through monitoring the bridge dynamic deflection in vibration. The deformation trend curves depicted over time also can warn the possible dangers.