Fiber Optic Sensors and Digital Image Correlation for Measuring Deformations in Reinforced Concrete Beams
Publication: Journal of Bridge Engineering
Volume 23, Issue 3
Abstract
Digital image correlation (DIC) and fiber optic strain sensors (FOSs) are two structural health monitoring (SHM) techniques that are reasonably well developed, but temperature effects remain a difficulty in interpreting the data. In this study, DIC and FOS were used to measure crack widths, deflections, and strains for eight large-scale RC beams tested under static and fatigue loading at room and low temperature. In addition, to evaluate the accuracy and precision of these technologies with temperature variations, calibration tests were conducted to measure the temperature-related strains induced in these systems. The results show that both DIC and FOS were affected by temperature changes, and thus their measurements need to be corrected for temperature when they are used for measuring strains. This study also shows that the DIC technique is capable of measuring crack widths and deflections with high accuracy, and external FOSs can measure strains in concrete in compression with reasonable accuracy. Based on the results of calibration tests, a methodology is proposed to determine the coefficient of thermal expansion (CTE) of the optical fibers to aid in interpreting fiber optic measurements under varying temperature conditions.
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Acknowledgments
The authors thank the Natural Sciences and Engineering Research Council of Canada [Strategic Grant and CREATE Sustainable Engineering in Remote Areas (SERA) programs], Transport Canada, and the Ontario Ministry of Transportation for their financial support of this research. Additionally, the authors are indebted to Andre Brault for recording the fiber data with the FOS analyzer.
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Published In
Journal of Bridge Engineering
Volume 23 • Issue 3 • March 2018
Copyright
© 2017 American Society of Civil Engineers.
History
Received: Feb 22, 2017
Accepted: Aug 30, 2017
Published online: Dec 19, 2017
Published in print: Mar 1, 2018
Discussion open until: May 19, 2018
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