Field Deployment and Laboratory Evaluation of 2D Digital Image Correlation for Deflection Sensing in Complex Environments
Publication: Journal of Bridge Engineering
Volume 24, Issue 4
Abstract
This study explored the application of two-dimensional digital image correlation (2D-DIC) for measuring deflections of in-service bridges. Within the emerging area of image-based structural health monitoring, this work builds from previous efforts to deploy vision-based sensing techniques for describing the operational behavior of structures. Whereas the literature includes deflection measurement systems using cameras mounted on fixed ground near the bridge span at maximum distances of approximately 300 m, this work proposes an innovative setup that enables deflection measurement in remote, offshore, and complex environments. This paper first describes a laboratory study aimed at evaluating the system performance and identifying the sources of measurement error, thus determining the level of confidence in the results and the range of applicability. The laboratory study demonstrated that the setup, designed using an inexpensive consumer-grade imaging system, had an average error consistently less than 0.2 mm (0.0075 in.). In addition, the system was deployed during a field test on a high-profile bridge structure nearly 1 mile offshore. The test program and results are presented to assess the logistics and performance of the system during load testing. Results from the study indicate the feasibility of the proposed setup for measuring deflections without a fixed ground reference.
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Acknowledgments
The authors acknowledge the Virginia Department of Transportation (VDOT) for providing access and logistical support for executing the field test. The contents of this paper reflect the views of the authors, but not necessarily the official views of the VDOT. A team of researchers from Virginia Tech, including Dr. Carin Roberts-Wollmann, Dr. Matthew Hebdon, James Riley, and Ezra Edwin, also contributed significantly to the collaborative field testing, which will be the subject of future publications. The authors thank undergraduate students Dequante McKoy and Ahmed Osman for their help with the experiments and data processing, Dr. Andrei Ramniceanu and Dr. Abdollah Bagheri for their help during the field test, and Keegan Gumbs for contributions to the laboratory study.
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Information & Authors
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Published In
Journal of Bridge Engineering
Volume 24 • Issue 4 • April 2019
Copyright
© 2019 American Society of Civil Engineers.
History
Received: Apr 5, 2018
Accepted: Sep 24, 2018
Published online: Jan 23, 2019
Published in print: Apr 1, 2019
Discussion open until: Jun 23, 2019
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