The fiber reinforced polymer (FRP) strengthening is significantly effective for enhancing the performances of concrete to the high strain rate loadings. However, the FRP retrofitted concrete members show different behaviors comparing to quasi-static cases. This study presents experimental observation on behaviors of meso-scale concrete members retrofitted with FRP sheets under low-velocity drop-weight impact loadings. Concrete specimens with the dimensions of 100×100×400 mm were fabricated and various FRP sheets were attached. The specimens with a reinforced bottom surface and the doubly reinforced specimens showed much higher energy absorptions. Also, reinforced concrete (RC) members were cast and reinforced with CFRP sheets. The FRP flexural and shear strengthening RC beams has weakness in the spalling failure because the impact load concentrated the concrete face which is not strengthened with FRP sheets.

ABSTRACT
 1. 서 론
 2. FRP 시트 보강 콘크리트 시편의 휨 거동
 3. FRP 시트 보강 RC 보의 충격저항 거동
 4. 결 론
 참고 문헌

• 민경환(고려대학교 건축사회환경공학부) | Min Kyung-Hwan
• 류두열(고려대학교 건축사회환경공학부) | Yoo Doo-Youl
• 이진영(고려대학교 건축사회환경공학부) | Lee Jin-Young
• 김미혜(고려대학교 건축사회환경공학부) | Kim Mi-Hye
• 윤영수(고려대학교 건축사회환경공학부) | Yoon Young-Soo