Failure patterns of dual headed bars in concrete loaded in tension and compression

  • Authors

    • Ayman A. Abdulhamed Northern Technical University Engineering Technical college/ Mosul
    • Haitham H. Saeed Northern Technical University Engineering Technical college/ Mosul
    2019-04-21
    https://doi.org/10.14419/ijet.v7i4.26838
  • Headed Reinforcement, Development Length, Compression Loading, Failure Pattern, Anchorage, Bond.

  • Headed bars are used as an alternative to hooked bars and reduce steel congestion and fabrication difficulties in reinforced concrete joints. But, according to the ACI 318 code, classical headed bars cannot be used to develop bars when they are subjected to compression loading. The use of dual headed bars can provide a solution to anchorage problems for bars loaded in compression. This paper presents comparison of failure patterns for classical single headed bars and dual headed bars loaded in tension and compression. The results showed that dual headed bars exhibited significant higher anchorage capacity than classical single headed bars loaded in compression. No improvement, or even slightly lower anchorage strength was recorded when dual headed bars were loaded in tension. The failure pattern in compression loading is improved a lot by using dual heads in which end blowout mode of failure is prevented.

     

     

     

  • References

    1. [1] ACI-ASCE Joint Committee 352 (Ed.) Recommendations for Design of Beam-Column Joints in Monolithic Reinforced Concrete Structures; ACI 352R-02; American Concrete Institute: Farmington Hills, MI, USA, 2002.

      [2] ACI Committee 318, 2014, Building Code Requirements for Structural Concrete and Commentary; ACI 318-14; American Concrete Institute: Farmington Hills, MI, USA, 2014, 520 pp.

      [3] R. A. DeVries, “Anchorage of Headed Reinforcement in Concrete,†PhD Dissertation, the University of Texas at Austin, Austin, Texas, Dec. 1996.

      [4] T. R Bashandy, “Application of Headed Bars in Concrete Members,†Ph.D. dissertation, The University of Texas at Austin, Austin, TX, Dec. 1996.

      [5] K. Ghimire, D. Darwin, and M. O’Reilly, “Anchorage of Headed Reinforcing Bars in Concrete,†SM Report No. 127, University of Kansas Center for Research, Inc., Lawrence, KS, Jan. 2018.

      [6] Y. Shao, D. Darwin, M. O’Reilly, R. D. Lequesne, K. Ghimire, and M. Hano, “Anchorage of Conventional and High-Strength Headed Reinforcing Bars,†SM Report No. 117, University of Kansas Center for Research, Inc., Lawrence, KS, Aug 2016.

      [7] M. K. Thompson, M. J. Ziehl, J. O. Jirsa, and J. E. Breen, “CCT Nodes anchored by headed bars—Part 1: Behavior of nodes,†ACI Structural Journal, V. 102, No. 6, Nov.-Dec. 2005, pp. 808-815.

      [8] M. K. Thompson, J. O. Jirsa, and J. E. Breen, “Behavior and capacity of headed reinforcement,†ACI Structural Journal, Vol. 103, No. 4, July-Aug. 2006, pp. 522-530.

      [9] V. Papadopoulos, J. Murcia-Delso, and P.B. Shing, “Development Length for Headed Bars in Slab-Column Joints of RC Slab Bridges,†Report No. SSRP-15/10 Dept. of Civil Engineering, University of California; San Diego, CA, December 2015

      [10] H.J. Lee, and S.Y. Yu, “Cyclic response of exterior beam-column joints with different anchorage methods,†ACI Structural Journal, Vol. 106, No. 3, May-June 2009, pp. 329-339.

      [11] S. W. McConnell, and J. W. Wallace, “Behavior of Reinforced Concrete Beam-Column Knee-Joints Subjected to Reversed Cyclic Loading,†Report No. CU/CEE-95-07, Department of Civil and Environmental Engineering, Clarkson University, June 1995.

      [12] J. L. Wright, and S. L. McCabe, “The Development Length and Anchorage Behavior of Headed Reinforcing Bars,†SM Report No. 44, University of Kansas Center for Research, Inc., Lawrence, Kansas, Sep. 1997.

      [13] S. Chun, and M.S. Bae, "Model for side-face blowout strength of large-diameter headed bars in beam-column Joint". Proceedings of the 2016 Structures Congress, Jeju Island, Korea, 28 August–1 September 2016; p. 6.

      [14] D.-U. Choi, “Test of headed reinforcement in pullout II: Deep Embedment,†International Journal of Concrete Structures and Materials, Vol. 18, No. 3E, Aug. 2006, pp. 151-159. https://doi.org/10.4334/IJCSM.2006.18.3E.151.

      [15] S. C. Chun, S. H. Lee, T. H. Kang, B. Oh, and J. W. Wallace, “Mechanical anchorage in exterior beam-column joints subjected to cyclic loading,†ACI Structural Journal, Vol. 104, No. 1, Jan.-Feb. 2007, pp. 102-112.

      [16] S. C. Chun, and Y.S. Shin, “Cyclic testing of exterior beam-column joints with varying joint aspect ratio,†ACI Structural Journal, Vol. 111, No. 3, May-June 2014, pp. 693-704. https://doi.org/10.14359/51686730.

      [17] P. D. Dhake, H. S. Patil, and Y. D. Patil, “Anchorage behavior and development Length of Headed Bars in Exterior Beam–Column Joints,†Magazine of Concrete Research, Vol. 67, No. 2, Aug. 2015, pp. 53-62. https://doi.org/10.1680/macr.14.00144.

      [18] T. H. Kang, and N. Mitra, "Prediction of performance of exterior beam-column connections with headed bars subject to load reversal". Eng. Struct. 2012, 41, pp. 209–217. https://doi.org/10.1016/j.engstruct.2012.03.036.

      [19] T. H. Kang, W. Kim, and M. Shin, “Cyclic testing for seismic design guide of beam-column joints with closely spaced headed bars,†Journal of Earthquake Engineering, Vol. 16, No. 2, May 2012, pp. 211-230. https://doi.org/10.1080/13632469.2011.610497.

      [20] T. H. Kang, S.-S Ha, and D.-U. Choi, “Bar pullout tests and seismic tests of small headed bars in beam-column joints,†ACI Structural Journal, Vol. 107, No. 1, Jan.-Feb. 2010, pp. 32-42.

  • Downloads

  • How to Cite

    A. Abdulhamed, A., & H. Saeed, H. (2019). Failure patterns of dual headed bars in concrete loaded in tension and compression. International Journal of Engineering & Technology, 7(4), 5783-5789. https://doi.org/10.14419/ijet.v7i4.26838