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Open AccessArticle

Long-Term Behavior of RC Beams Strengthened with Hybrid Composite Beam

1
School of Architecture, Kyungpook National University, Daegu, 41566, Korea
2
School of Architecture, Yeung Nam University, Gyeongsan 38541, Korea
*
Author to whom correspondence should be addressed.
Appl. Sci. 2019, 9(9), 1734; https://doi.org/10.3390/app9091734
Received: 20 February 2019 / Revised: 5 April 2019 / Accepted: 23 April 2019 / Published: 26 April 2019
(This article belongs to the Special Issue Fiber-Reinforced Concrete)
This paper describes the results of long-term tests on reinforced concrete (RC) beams strengthened with hybrid composite beam (HCB) under two different sustained loads. Test specimens were fabricated to reflect the most common RC beam size used in school buildings in South Korea. The specimens had dimensions of 400 mm (width) × 600 mm (depth) × 6000 mm (length), and were tested with or without external strengthening by a hybrid composite beam (HCB). Test results showed that strengthening the RC beams with HCB not only reduced the instantaneous deflection but was also effective in decreasing long-term deflection. In this study, time-dependent factors were investigated using a modified version of the American Concrete Institute (ACI) equation. Time-dependent factors of HCB-strengthened RC beams found in the present work differed from those of other investigations due to various experimental conditions. In the present study, we found that the ACI equation may not provide a reasonable estimation of the long-term behavior of HCB-strengthened RC beams. View Full-Text
Keywords: hybrid composite beam; long-term behavior; time-dependent factor; RC beam; strengthening hybrid composite beam; long-term behavior; time-dependent factor; RC beam; strengthening
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MDPI and ACS Style

Kim, I.-H.; Lee, H.-J.; Kang, J.-W.; Choi, Y. Long-Term Behavior of RC Beams Strengthened with Hybrid Composite Beam. Appl. Sci. 2019, 9, 1734.

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