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고성능 섬유보강 RC 보의 전단강도 설계식 개발에 관한 연구
곽윤근,권철성,이헌석,김우석,Kwak, Yoon-Keun,Kwon, Cheol-Sung,Lee, Heon-Seok,Kim, Woo-Suk 한국섬유공학회 2018 한국섬유공학회지 Vol.55 No.3
This paper deals with the shear strengthening effect of reinforced concrete (RC) beams strengthened with high-performance fiber sheets. There are many kinds of high-performance fibers, the high-performance fibers used in this study are carbon fibers. Fifteen strengthened RC beams, including a control beam, were experimentally evaluated to determine the improvements in shear strength. Test parameters were the strengthening ratios and strengthening methods of carbon fiber sheets (I-S, I-W, U-S, and U-W type). RC beams strengthened with carbon fiber sheets were tested under four-point loads. Considering strengthening ratios and strengthening methods of carbon fiber sheets, shear capacity and failure mode of test specimens were evaluated. The results show that the shear capacity of beams strengthened with carbon fiber sheets are approximately 28.8% in I-S type, 20.5% in I-W type, 26% in U-S type, and 28.70% in U-W type higher than that of the control beam. The results of previous tests by other researchers were reviewed to evaluate the shear strength of RC beams strengthened with carbon fiber sheets. Existing equations for predicting the shear strength of such beams were examined, and a new equation based on empirical observations was proposed. The proposed equation gave accurate estimates for the 84 shear specimens evaluated.
단부구속조건에 따른 탄소섬유시트로 보강된 RC보의 휨보강 효과
김하용,곽윤근,권철성,권우현,김우석,백승민 대한건축학회 2006 大韓建築學會論文集 : 構造系 Vol.22 No.12
This paper deals with the flexural strengthening effect of RC beams strengthened by carbon fiber sheets which is the most commonly used in strengthening materials. Test parameters in this experimental study are strengthened length of carbon fiber sheets (100%-2580㎜, 70%-1790㎜), strengthening methods (B type, U type), the number of carbon fiber sheets (1ply, 2ply) and end restrainted by U type strip (0, 0.5D, 1.0D) of C.F.S. Based on this test results, it is shown that the increase of strength ranged from 22.36% to 67.67% over the strength of control beam. It is also found that the flexural capacity of RC beams strengthened by 100% bond length is almost similar to that of RC beams strengthened by 70% bond length. Additionally, experimental results are compared with theoretical equations available in the literatures and good agreement is observed.