본 논문은 콘크리트 구조물 보강공법 중 하나인 CFRP 표면매립 긴장보강의 거동을 분석하였다. 이를 위해 CFRP 긴장재 및 긴장시스템을 개발하고 손상후 보강거동 및 충전재 유무에 따른 비부착 보강거동을 고찰하였다. 실험결과, 비부착 실험 체의 보강효과는 무보강 실험체보다 38% 증가하지만, 부착 실험체보다 17% 감소하였다. 손상된 콘크리트를 보강한 경우는 건전한 콘크리트의 보강효과와 유사했다. 정착장치와 부착된 CFRP 긴장재는 안정된 보강효과를 보였다.

Carbon fiber reinforced polymer (CFRP) strengthens concrete structures due to its corrosion resistance. Various structural strengthening methods have been developed and applied to strengthen deteriorated reinforced concrete structures, such as externally bonded reinforcements (EBRs) and near surface mounted (NSM) systems. However, both EBR and NSM reinforcement demonstrate premature failure. Recent research has attempted to prestress NSM reinforcement, but this requires a special prestressing system and various strengthening behaviors without filler. Therefore, this study develops a CFRP tendon and prestressing system for NSM reinforcement and investigates the strengthening effect considering the unbonded performance without filler and the damaged concrete. The test results reveal that the unbonding of the CFRP tendon improves the strengthening effect by 38%; however, it remains 17% less strong than the bonded specimen. The strengthening effect of the damaged concrete is similar to that of the general strengthened specimen. The use of a CFRP tendon with filler and anchorage system appears to improve stable strengthening behavior.

Abstract
1. 서 론
2. 보강성능 실험
    2.1 실험 변수
    2.2 CFRP 긴장재
    2.3 실험체 제작 및 보강
    2.4 실험 개요 및 계측계획
3. 실험결과
    3.1 파괴 및 균열 결과
    3.2 CFRP 긴장재 비부착 거동 분석
    3.3 모재 콘크리트 손상 거동 분석
    3.4 CFRP 긴장재 변형률
4. 결 론
REFERENCES
국문초록

• 정우태(한국건설기술연구원) | Jung Woo-Tai (Department of Infrastructure Safety Research) Corresponding author
• 박종섭(한국건설기술연구원) | Park Jong-Sup (Department of Infrastructure Safety Research)
• 강재윤(한국건설기술연구원) | Kang Jae-Yoon (Department of Infrastructure Safety Research)
• 박희범(한국건설기술연구원) | Park Hee Beom (Department of Infrastructure Safety Research)
• 김상현(한국건설기술연구원) | Kim Sang-Hyun (Department of Infrastructure Safety Research)