International Journal of Concrete Structures and Materials

  • 제18권3E호
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  • Pages.151-159
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  • 2006
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  • 1976-0485(pISSN)
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  • 2234-1315(eISSN)
한국콘크리트학회 (Korea Concrete Institute)
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Test of Headed Reinforcement in Pullout II: Deep Embedment

  • Choi, Dong-Uk (Dept. of Architectural Engineering, Hankyong National University)
  • 발행 : 2006.12.31
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초록

A total of 32 pullout tests were performed for the multiple headed bars relatively deeply embedded in reinforced concrete column-like members. The objective was to determine the minimum embedment depth that was necessary to safely design exterior beam-column joints using headed bars. The variables for the experiment were embedment depth of headed bar, center-to-center distance between adjacent heads, and amount of supplementary reinforcement. Regular strength concrete and grade SD420 reinforcing steel were used. The results of the test the indicated that a headed bar embedment depth of $10d_b$ was not sufficient to have relatively closely installed headed bars develop the pullout strength corresponding to the yield strength. All the experimental variables, influenced the pullout strength. The pullout strength increased with increasing embedment depth and head-to-head distance. It also increased with increasing amount of supplementary reinforcement. For a group of closely-spaced headed bars installed in a beam-column joint, it is recommended to use column ties at least 0.6% by volume, 1% or greater amount of column main bars, and an embedment depth of $13d_b$ or greater simultaneously, to guarantee the pullout strength of individual headed bars over 125% of $f_y$ and ductile load-displacement behavior.

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참고문헌

  1. Ghali, A. and Youakim, S. A., 'Headed Studs in Concrete: State of the Art,' ACI Structural Journal, Vol.102, No.5, 2005, pp.657~667
  2. DeVries, R. A., Anchorage of Headed, Reinforcement in Concrete, Ph.D. Dissertation , The Univ. of Texas at Austin, 1996, 293pp
  3. Bashandy, T. R .B., Application of Headed Bars in Concrete Members, Ph.D. Dissertation, The Univ. of Texas at Austin, 1996, 302pp
  4. Thompson, M. K., The Anchorage Behavior of Headed Reinforcement in CCT Nodes and Lap Splices, Ph.D. Dissertation, The Univ. of Texas at Austin, 2002, 501pp
  5. Choi, D. U., Hong, S. G, and Lee, C. Y, 'Test of Headed Reinforcement in Pullout,' KCI Concrete Journal, Vol.14, No.3, 2002, pp.102~ 110
  6. Dilger, W. H. and Ghali, A., 'Double-Head Studs as Ties in Concrete,' ACI Concrete International, 1997, pp.59~66
  7. DeVries, R. A., Jirsa, J.O., and Bashandy, T., 'Anchorage Capacity in Concrete of Headed Reinforcement with Shallow Embedments,' ACI Structural Journal, Vol.96, No.5, 1999, pp.728~736
  8. Thompson, K. H., Ziehl, M. J., Jirsa, J. O., and Breen, J. E., 'CCT Nodes Anchored by Headed Bars-Part I: Behavior of Nodes,' ACI Structural Journal, Vol.102, No.6, 2005, pp.808~815
  9. Wallace, J. W., 'Headed Reinforcement A Viable Option,' ACI Concrete International, 1997, pp.47~53
  10. Wallace, J. W., McConnell, S. W., Gupta, P., and Cote, P.A. 'Use of Headed Reinforcement in Beam-Column Joints Subjected to Earthquake Loads,' ACI Structural Journal, Vol.95, No.5, 1998, pp.590~606
  11. Park, H. K., Yoon, Y. S., and Kim, Y. H., 'The effect of head plate details on the pull-out behaviour of headed bars,' Magazine of Concrete Research, Vol. 55, No.6, 2003, pp.485~496 https://doi.org/10.1680/macr.2003.55.6.485
  12. ASTM A 970/A 970M-98, Standard Specification for Welded or Forged Headed Bars for Concrete Reinforcement, American Society for Testing and Materials, 1998
  13. ASTM A 970/A 970M-04, Standard Specification for Headed Steel Bars for Concrete Reinforcement, American Society for Testing and Materials, 2004
  14. ACI Committee 349, Code Requirements for Nuclear Safety Related Concrete Structures (349-97), American Concrete Institute, 1997
  15. ACI Committee 318, Building Code Requirements for Structural Concrete (318M-05) and Commentary (318RM-05), American Concrete Institute, 2005

피인용 문헌

  1. Joint Shear Behavior Prediction for RC Beam-Column Connections vol.5, pp.1, 2011, https://doi.org/10.4334/IJCSM.2011.5.1.057