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순환굵은골재 콘크리트보의 크기효과에 따른 전단거동 평가
김봉필(Kim, Bong-Pil),신우철(Shin, Woo-Cheol),이호경(Lee, Ho-Kyung),백승민(Baek, Seung-Min),김우석(Kim, Woo-Suk),곽윤근(Kwak, Yoon-Keun) 대한건축학회 2017 大韓建築學會論文集 : 構造系 Vol.33 No.10
In this study, we investigated the size effect in accordance with width-to-depth ratio (1.0, 1.5, 2.0, 2.5, and 3.0) of reinforced concrete beams as well as comparison with two types of beams using natural coarse aggregates (NCAs) and recycled coarse aggregates (RCAs). As a test result, while width-to-depth ratio increased from 1.0 to 1.5, shear strengths of specimens using NCAs and RCAs mostly decreased. Also, the overall reduction ratio was similar to that of NCA specimens by 32% and RCA specimens by 31.8%. The ratio of the experimental value to the theoretical value by the design equation for shear in reinforced concrete by KBC, CEP-FIP, JSCE, and AIJ codes etc. is stable from 1.14 to 1.46.
탄소섬유보강재로 보강한 순환골재 콘크리트보의 휨보강효과에 관한 실험적 연구
김우석(Kim, Woo-Suk),박희만(Park, Hee-Man),김봉필(Kim, Bong-Pil),백승민(Baek, Seung-Min),곽윤근(Kwak, Yoon-Keun) 대한건축학회 2014 大韓建築學會論文集 : 構造系 Vol.30 No.7
Recycled coarse aggregates (RCAs) made by construction waste can be used as concrete aggregates. Nevertheless, some studies have indicated that increasing the RCA replacement ratios of the reinforced concrete (RC) structures resulted in a decrease in failure load capacity, in strength degradation, and in severe cracking. In this study, the use of carbon fiber reinforcement polymer (CFRP) sheets and CFRP plates in RC structures was evaluated for their effect in suppressing cracking and in adding strength to the structure. Twelve specimens including five control beams were fabricated, using various recycled coarse aggregate substitution rates, to compare and analyze the CFRP material’s reinforcement effects. All specimens were fabricated with stirrups as simple beams with fixed span to effective depth ratio of 3.88 to 1 (i.e., a/d=3.88). The main variables studied in this investigation are (1) replacement level of recycled coarse aggregates (0, 15, 30 and 50%), (2) tensile reinforcement ratio (0.8, 1.27%), and (3) the incorporation of CFRP sheets and/or CFRP plates.