Journal of the Architectural Institute of Korea Structure & Construction (대한건축학회논문집:구조계)

Architectural Institute of Korea (대한건축학회)
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Confinement Effects on the Bond Properties of Reinforcement with Improved Rib-Shape

개선된 마디형상 철근의 부착성능에 대한 횡구속 효과

  • Received : 2011.12.27
  • Published : 2012.02.25
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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.

Keywords

Acknowledgement

Supported by : 호서대학교

References

  1. Darwin, D., Zou, J., Tholen, m. L. and K.ldun, E., Splice strength of high relative rib area reinforcing bars, ACI Structural Journal, Jan.-Feb., 1996, pp. 95-106
  2. Darwin, D., Zou, J., Tholen, m. L. and K.ldun, E., Development length criteria for conventional and high relative rib area reinforcing bars, ACI Structural Journal, May-June, 1996, pp. 347-358
  3. Hamad, B. S., Bond strength improvement of reinforcing bars with specially designed rib geometries, ACI Structural Journal, Jan.-Feb., 1995, pp. 3-13
  4. 홍건호, 김진아, 최완철, 철근 마디 형상에 따른 RC 휨부재의 부착강도 평가, 한국콘크리트학회 논문집, Vol.23, No.3, 2011. 6, pp. 393-400
  5. 한국콘크리트학회, 콘크리트구조설계기준해설, 2007, pp. 203-234
  6. Orangun, C. O., Jirsa, J. O. and Breen, J. E., A reevaluation of test data on development length and splices, ACI Journal, 1977, pp. 114-122
  7. ACI Committee 408, Splice and development length of high relative rib area reinforcing bars in tension and commentary(408.3-01), ACI Manual of Concrete Practice, 2008
  8. 홍건호, 최동욱, 최완철, 홍기섭, 높은 마디면적 고강도 철근의 부착강도에 관한 실험적 연구, 한국콘크리트학회 논문집, Vol.17, No.3, 2005. 6, pp. 375-384