개선된 마디형상 철근의 부착성능에 대한 횡구속 효과

다국어 초록 (Multilingual Abstract)

High strength reinforcements were recently developed as the needs for high strength structural materials in building structure arose, and these were caused the increase of concerns about the bond properties of reinforcement. This paper reports the works about the beam splice tests which test variables were rib shape, confinement by the stirrups and concrete compressive strength. Total 8 simple beam type specimens which had the lap splice in the middle span zone were tested, and each specimen designed to occur the bond failure in the splice area of the beam before the tensile reinforcements yielded. Test data was analyzed to define the influence of the 3 variables in the viewpoint of bond strength, and compared with present local design code requirements and existing research results. Test results indicated that high relative rib area and the improvement of rib shape can increase the bond strength, and the confinement effect by placing the stirrups can increase the bond strength up to 8～36%. Local structural design code requirements for development and splice length of the reinforcement excessively underestimate the bond strength, and the proposed equation of ACI 408 committee rather agreed with the test results.

목차 (Table of Contents)

• Abstract
• 1. 서론
• 2. 정착 및 이음길이 설계기준 분석
• 3. 실험 계획 및 방법
• 4. 부착강도 비교
• 5. 횡구속 철근 영향에 따른 부착강도 분석
• 6. 결론
• 참고문헌

참고문헌 (Reference)

1 정영수, "콘크리트구조설계기준 해설" 한국콘크리트학회 203-234, 2007

2 홍건호, "철근 마디 형상에 따른 RC 휨부재의 부착강도 평가" 한국콘크리트학회 23 (23): 393-400, 2011

3 홍건호, "높은 마디면적 고강도 철근의 부착강도에 관한 실험적 연구" 한국콘크리트학회 17 (17): 375-384, 2005

4 Darwin, D., "Splice strength of high relative rib area reinforcing bars" 95-106, 1996

5 ACI Committee 408, "Splice and development length of high relative rib area reinforcing bars in tension and commentary"

6 Darwin, D., "Development length criteria for conventional and high relative rib area reinforcing bars" 347-358, 1996

7 Hamad, B. S., "Bond strength improvement of reinforcing bars with specially designed rib geometries" 3-13, 1995

8 Orangun, C. O., "A reevaluation of test data on development length and splices" 114-122, 1977