An Experimental Study on Bond Strength of High-Strength Reinforcing Bars with High Relative Rib Area

높은 마디면적 고강도 철근의 부착강도에 관한 실험적 연구

  • Hong Geon-Ho (Dept. of Architectural Engineering, Hoseo University) ;
  • Choi Dong-Uk (Dept. of Architecture, Hankyong National University) ;
  • Choi Oan-Chul (Dept. of Architecture, Engineering, Soong-Sil University) ;
  • Hong Gi-Suop (Dept. of Architecture, Hong-Ik University)
  • Published : 2005.06.01


The effects of bar deformation properties on bond of steel reinforcing bars to concrete are experimentally studied to predict the bond strength. Based on the previous research about high relative rib area, bond strength between reinforcing bars and concrete can be improved by the control of rib height and spacing. But, the equations in Korean code provisions to estimate development and splice length do not include these specifications of reinforcing bars. So the purpose of this paper is to determine the effect of relative rib area to the bond strength. This paper describes 2 kinds of experimental researches. Thirty beam-end specimens were tested to investigate the effects of bar size and relative rib areas ranging from 0.112 to 0.162. And, twelve lap-splice beam specimens were tested to the same variables. Each test results are normalized and compared with the proposed equations of ACI 408 committee. The results show that bond strength is increased as bar size and the relative rib area(Rr) increase. The distribution of flexural cracks and failure aspect do not appear to be affected by $R_r$.


  1. 김종수, 김대영, 은성운, 김용남, '고강도 철근(SD500)의 실용화에 관한 연구', 콘크리트학회지, 2003. 2, pp.86-89
  2. 이재열, 김병국, 홍기섭, 최완철, '반복하중시 철근마디높이에 따른 부착 손상특성', 콘크리트학회논문집, 15권 1호, 2003, pp.17-24
  3. 홍건호, 최완철, '이형철근의 부착강도에 대한 마디형태의 영향', 콘크리트학회지, 16권 4호, 2004, pp.95-99
  4. ACI Committee, 'Splice and Development of High Relative Rib Area Reinforcing Bars in Tension(ACI 408.3-01) and Commentary(ACI 408.3R-01),' ACI, Farmington Hills, 2001, 6pp
  5. Choi, O. C. et al., 'Bond of Epoxy-Coated Rein-forcement to Concrete : Bar Parameter,' ACI Materials Journal, Vol.88, No.2, Mar.-Apr. 1991, pp.207-217
  6. Darwin, D. and Graham, E. K., 'Effect of Deformation Height and Spacing on Bond Strength of Reinforcing Bars,' ACI Structural Journal, Vol.90, No.6, Nov.-Dec. 1993, pp.646-657
  7. Darwin. D. et al., 'Splice Strength Of High Relative Rib Area Reinforcing Bars,' ACI Structural Journal, Vol.93, No.1, Jan.-Feb. 1996, pp.95-107
  8. Tefers, R., 'Cracking of Concrete Cover Along Anchored Deforrred Reinforcing Bars,' Magazine of Concrete Research, Vol.31, No.106 Mar. 1979, pp.3-12
  9. Skorbogatov, S. M. and Edwards. A. D., 'The Influence of Geometry of Deformed Steel Bars on Their Bond Strength in Concrete: Bar Parameters,' ACI Materials Journal, Vol.88, No.2, Mar.-Apr. 1979, pp.207-217

Cited by

  1. Bond Strength Evaluation of RC Beams on the Rib Shape of Reinforcing Bars vol.23, pp.3, 2011,