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Computers and Concrete Volume 38, Number 3, September 2026 , pages 527-549 DOI: https://doi.org/10.12989/cac.2026.38.3.06 |
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Analytical model for tensile strength reduction of corroded reinforcing bars |
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Tae-Hoon Kim, Choon-Seok Bang, Yun-Suk Kang, Leehyeon Kim, Chang-Ho Sun, Ick-Hyun Kim
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| Abstract | ||
| This study investigated reinforcing bar corrosion, which affects the durability and structural safety of deteriorated reinforced concrete structures owing to aging, and the reduction in tensile strength among the mechanical property changes caused by it. Reinforcing bar corrosion leads to cross-sectional, material strength, and bond strength losses, impacting the mechanical properties, failure modes, and seismic performance of all members. To understand this, the expected corrosion of reinforcing bar specimens was estimated based on the amount of charge passing through the proposed circuit over a certain period, according to Faraday's law. The developed quantification method could be used to experimentally predict the corrosion characteristics of the reinforcing bar. Based on the results of monotonic tensile tests on 210 accelerated corroded reinforcing bar specimens, an appropriate reduction formula for the mechanical property of tensile strength loss was proposed. The validity of this formula was verified through the application of a validated nonlinear finite element analysis to deteriorated solid reinforced concrete column specimens—such as those subjected to aging—and by comparing and analyzing the experimental results. | ||
| Key Words | ||
| Faraday's law; nonlinear finite element analysis; reduction formula; reinforcing bar corrosion; tensile strength | ||
| Address | ||
| Tae-Hoon Kim, Choon-Seok Bang, Yun-Suk Kang, Leehyeon Kim: Track & Civil Infrastructure Division, Korea Railroad Research Institute, 176, Cheoldobangmulgwan-ro, Uiwang-si, Gyeonggi-do, 16105, Republic of Korea Chang-Ho Sun, Ick-Hyun Kim: Department of Civil and Environmental Engineering, University of Ulsan, 93, Daehak-ro, Nam-gu, Ulsan-si, 44610, Republic of Korea | ||