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Article

Uniaxial Static Stress Estimation for Concrete Structures Using Digital Image Correlation

1
School of Urban and Environmental Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Korea
2
Department of Civil Engineering, University of Seoul, Seoul 02504, Korea
*
Author to whom correspondence should be addressed.
Sensors 2019, 19(2), 319; https://doi.org/10.3390/s19020319
Received: 28 November 2018 / Revised: 7 January 2019 / Accepted: 9 January 2019 / Published: 15 January 2019
(This article belongs to the Special Issue Bridge Structural Health Monitoring and Damage Identification)
This paper proposes a static stress estimation method for concrete structures, using the stress relaxation method (SRM) in conjunction with digital image correlation (DIC). The proposed method initially requires a small hole to be drilled in the concrete surface to induce stress relaxation around the hole and, consequently, a displacement field. DIC measures this displacement field by comparing digital images taken before and after the hole-drilling. The stress level in the concrete structure is then determined by solving an optimization problem, designed to minimize the difference between the displacement fields from DIC and the one from a numerical model. Compared to the pointwise measurements by strain gauges, the full-field displacement obtained by DIC provides a larger amount of data, leading to a more accurate estimation. Our theoretical results were experimentally validated using concrete specimens, demonstrating the efficacy of the proposed method. View Full-Text
Keywords: concrete; digital image correlation; stress relaxation method concrete; digital image correlation; stress relaxation method
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MDPI and ACS Style

Lee, J.; Kim, E.J.; Gwon, S.; Cho, S.; Sim, S.-H. Uniaxial Static Stress Estimation for Concrete Structures Using Digital Image Correlation. Sensors 2019, 19, 319. https://doi.org/10.3390/s19020319

AMA Style

Lee J, Kim EJ, Gwon S, Cho S, Sim S-H. Uniaxial Static Stress Estimation for Concrete Structures Using Digital Image Correlation. Sensors. 2019; 19(2):319. https://doi.org/10.3390/s19020319

Chicago/Turabian Style

Lee, Junhwa, Eun J. Kim, Seongwoo Gwon, Soojin Cho, and Sung-Han Sim. 2019. "Uniaxial Static Stress Estimation for Concrete Structures Using Digital Image Correlation" Sensors 19, no. 2: 319. https://doi.org/10.3390/s19020319

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