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Title |
An Experimental Study on Torsional Behavior of Reinforced Concrete Beams Strengthened by GFRP Sheets
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Authors |
최경은(Kyeong-Eun Choi) ; 김민준(Min-Jun Kim) ; 김두산(Doo-San Kim) ; 김형국(Hyeong-Gook Kim) ; 김길희(Kil-Hee Kim) |
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DOI |
https://doi.org/10.4334/JKCI.2022.34.1.033 |
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Keywords |
철근콘크리트; 순수비틀림; 비틀림 내력; GFRP 시트; 섬유 보강 방향 reinforced concrete; pure torsion; torsional strength; GFRP sheet; fiber reinforcing direction |
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Abstract |
In this study, pure torsion tests of reinforced concrete beams strengthened by Glass Fiber Reinforced Polymer (GFRP) sheet were conducted to provide a database for the preparation of structural standards for Fiber Reinforced Polymer (FPR) torsion reinforcement in Korea. The fiber directions of an existing GFRP sheet were used as main variables. As a result of the tests, the maximum torsional strength of the specimens strengthened by GFRP sheets were improved by an average of 50 % compared with that of the unstrengthened specimen. This showed that GFRP reinforcement was fairly effective in improving the torsional strength of RC beams with minor damage. In addition, test results was compared to analytical results from KDS 14 20, fib Bulletin 14, and Taljsten’s model. It was found that while the KDS 14 20 underestimates the test results, the fib Bulletin 14 and Taljsten’s model provide favorable predictions.
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