Curvature Monitoring of Beams Using Digital Image Correlation
Publication: Journal of Bridge Engineering
Volume 19, Issue 3
Abstract
A method for measuring longitudinal strains with the height at a section, and thus the curvature, using a technique based on digital image correlation (DIC), is presented. The background to this technique is introduced as well as previous work in this area. The accuracy of DIC under ideal conditions is established using artificially generated images that represent beams with various curvatures. The practical accuracy of DIC is established by comparing the strains measured using DIC to those predicted by elastic theory and measured using strain gauges for a steel beam. The correlation between these results is found to be excellent. DIC is then used to measure curvatures in RC beams and these results are compared with analytically predicted results with good agreement. The choice of an appropriate gauge length for RC is discussed and is shown to be one of the significant advantages of using DIC as opposed to strain gauges in both laboratory testing and field monitoring of bridge structures.
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Acknowledgments
The authors acknowledge the Natural Science and Engineering Research Council of Canada for their support of this research. The authors also thank Danielle DeRosa, Adam Hoag, Keelin Scully, Neil Porter, and Paul Thrasher for their assistance with the experimental program.
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Published In
Journal of Bridge Engineering
Volume 19 • Issue 3 • March 2014
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Dec 3, 2012
Accepted: Jul 22, 2013
Published online: Jul 24, 2013
Published in print: Mar 1, 2014
Discussion open until: May 3, 2014
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