In this study, experimental research was carried out to improve the seismic performance of reinforced concrete exterior beam-column joint regions using replacing recycled coarse aggregate with hybrid fiber (steel fiber+PVA fiber) in existing reinforced concrete building. Therefore it was constructed and tested seven specimens retrofitting the beam-column joint regions using such retrofitting materials.
Specimens, designed by retrofitting the beam-column joint regions of reinforced concrete building, were showed the stable failure mode and increase of load-carrying capacity due to the effect of crack control at the times of initial loading and bridge of retrofitting hybrid fiber during testing.
Specimens BCJGPSR series, designed by the retrofitting of replacing recycled coarse aggregate with hybrid fiber in reinforecd beam-column joint regions were increased its maximum load carrying capacity by 1.01~1.04 times and its energy dissipation capacity by 1.06~1.29 times in comparison with standard specimen BCJS. Also, specimen BCJGPSR1 were increased its energy dissipation capacity by 1.33~1.65 times in comparison with specimens BCJS, BCJP and BCJGPR series for a displacement ductility of 9.

1. 서 론
 2. 순환굵은골재 치환과 하이브리드섬유 혼입에 따른철근콘크리트 보-기둥 접합부의 내진성능 실험
  2.1 실험체의 형태 및 변수
  2.2 사용재료 특성
  2.3 실험방법 및 장치
 3. 순환굵은골재 치환과 하이브리드섬유 혼입에 따른철근콘크리트 보-기둥 접합부의 내진성능 평가
  3.1 이력거동 특성
  3.2 파괴형태
  3.3 강도변화 특성
  3.4 강성변화 특성
  3.5 에너지 소산능력
 4. 결 론
 감사의 글
 References

• 하재훈(정회원, 사)건설기술정책연구원 선임연구원, 공학박사) | Jae-Hoon Ha
• 하기주(정회원, 경일대학교 건축공학과 정교수, 공학박사) | Gee-Joo Ha 교신저자
• 신종학(정회원, 경일대학교 건축공학과 명예교수, 공학박사) | Jong-Hak Shin