Twenty-two specimens simulating typical exterior beam-column joints in a structure were tested to evaluate the capacity of anchored beam reinforcement subjected to varying degrees of confinement at the joint. The effects of column axial load, vertical column reinforcement, side concrete cover, and lateral reinforcement through the joint on the performance of standard hooked bars were studied. The tests were conducted using either #7 or #11 beam bars anchored in the columns. Standard 90 or 180 deg hooks conforming to AC1 318-71 specifications were used throughout. Based on observarions of the test specimens, current AC1 318-71 Code specifications are studied and design recommendations for hooked bar anchorages proposed. Comparison of the proposed design recommendations with the measured results indicated that higher stresses could be allowed for hooked anchorages provided that confinement in the form of cover or ties and straight lead embedment before the hook were sufficient.

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  • Corporate Authors:

    American Concrete Institute

    P.O. Box 19150, Redford Station, 22400 Seven Mile Road
    Detroit, MI  United States  48219
  • Authors:
    • Margues, JLG
    • Jirsa, James O
  • Publication Date: 1975-5

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Subject/Index Terms

Filing Info

  • Accession Number: 00098430
  • Record Type: Publication
  • Report/Paper Numbers: Title No. 72-18 Proceeding
  • Files: TRIS
  • Created Date: Sep 30 1975 12:00AM