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http://dx.doi.org/10.4334/JKCI.2011.23.3.393

Bond Strength Evaluation of RC Beams on the Rib Shape of Reinforcing Bars  

Hong, Geon-Ho (Dept. of Architectural Engineering, Hoseo University)
Kim, Jin-Ah (Dept. of Architectural Engineering, Hoseo University)
Choi, Oan-Chul (Dept. of Architectural Engineering, Soongsil University)
Publication Information
Journal of the Korea Concrete Institute / v.23, no.3, 2011 , pp. 393-400 More about this Journal
Abstract
The needs for high strength structural materials have recently increased, because construction and cost efficiencies are demanded by the costumers. But, the use of high strength reinforcing bars requires longer development and splice lengths compared to normal strength bars. This restriction may cause reduction in construction efficiency and require more complicated details. The purpose of this paper is to evaluate the bond strength on the rib shape of reinforcing bars to decrease development and splice lengths of high strength reinforcements. Total of 5 simple beam specimens were tested, and the main test variable was a rib shape of reinforcing bars. Test data was analyzed in the viewpoint of bond strength, load-deflection relationship, and crack pattern. Test results indicated that the bond strength of high relative rib area reinforcing bars increased up to 11% compared to normal strength reinforcements. And the improved rib shape reinforcements, which were formed with high and low height rib, increased the bond strength up to 23% even though the relative rib area was same as the high relative rib area reinforcements. Serviceability performances such as deflection number of cracking, and maximum crack width were similar in all specimens, so it is safe to conclude that the improved rib shape reinforcements can be applied to the structural members.
Keywords
rib shape; relative rib area; bond strength; lap splice; crack;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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1 김종수, 김대영, 은성운, 김용남, "고강도 철근(SD500)의 실용화에 대한 연구," 콘크리트 학회지, 15권, 2호, 2003, pp. 86-89.
2 홍건호, 최동욱, 최완철, 홍기섭, "높은마디면적 고강도 철근의 부착강도에 관한 실험적 연구," 콘크리트학회 논문집, 17권, 3호, 2005, pp. 375-384.   과학기술학회마을   DOI   ScienceOn
3 홍건호, 최완철, "이형 철근의 부착강도에 대한 마디 형태의 영향," 콘크리트 학회지, 16권, 4호, 2004, pp.95-99.
4 Darwin, D., Zuo, J., Tholen, M. L., and K.ldun, E., "Development Length Criteria for Conventional and High Relative Rib Area Reinforcing Bars," ACI Structural Journal, Vol. 93, No. 3, 1996, pp. 347-358.
5 김기성, "대형 마디를 갖는 이형 철근의 부착강도 연구," 숭실대학교 건축학과, 석사학위 논문, 2007, pp. 1-13.
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 Jirsa, J. O., Lutz, L. A., and Gergely, P., "Rational for Suggested Development, Splice and Standard Hook Provisions for Deformed Bars in Tension," Concrete Int., Vol. 1, No. 7, 1979, pp. 47-61.
8 한국콘크리트학회, 콘크리트구조설계기준 해설, 기문당, 2007, pp. 205-209.
9 ACI Committee 408, Splice and Development Length of High Relative Rib Area Reinforcing Bars in Tension and Commentary, American Concrete Institute, ACI Manual of Concrete Practice, 2008, pp. 408.3-1-408.3-3.
10 한국콘크리트학회, 콘크리트구조설계기준 해설, 기문당, 2007, pp. 495-503.