This paper presents experimental results for evaluating bond strength of FRP Hybrid Bars(HYB). In order to confirm the bond strength of HYB, direct bond strength tests were performed on 20 specimens. 20 specimens made of deformed steel bars were also tested for relative comparison. HYB and deformed steel bars were embedded in a concrete block with a size of 200 mm and different attachment lengths were applied depending on the diameter of the reinforcing bars. During the test, load and relative displacement(slip) were measured and the load-displacement behaviors of all specimens were analyzed from the measured results. The maximum bond strength of deformed steel bars were higher than that of HYB regardless of its diameter. However, after the maximum load, the deformed steel bars were more dominant than the HYB in the sudden load reduction tendency.

Abstract
 1. 서 론
 2. 부착 시험 계획 및 방법
  2.1 시험 변수 및 사용 재료 특성
  2.2 부착 시험체 제작
  2.3 시험체 설치 및 계측 계획
 3. 시험 결과 및 토의
  3.1 시험 결과 요약
  3.2 직경별 이형철근과 HYB의 부착 특성 비교
 4. 결 론
 REFERENCES

• 정규산(한국건설기술연구원 노후인프라연구센터 박사후연구원) | Jung Kyu-San (Post-Doctoral Researcher, Korea Institute of Civil Engineering and Building Technology)
• 박기태(한국건설기술연구원 노후인프라연구센터 선임연구위원) | Park Ki-Tae (Senior Research Fellow, Korea Institute of Civil Engineering and Building Technology)
• 유영준(한국건설기술연구원 노후인프라연구센터 연구위원) | You Young-Jun (Researcher Fellow, Korea Institute of Civil Engineering and Building Technology)
• 김병철(한국건설기술연구원 노후인프라연구센터 전임연구원) | Kim Byeong-Cheol (Research Specialist, Korea Institute of Civil Engineering and Building Technology)
• 박준석(한국건설기술연구원 노후인프라연구센터 박사후연구원) | Park, Joon-Seok (Post-Doctoral Researcher, Korea Institute of Civil Engineering and Building Technology) Corresponding author