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Founded in 1904 and headquartered in Farmington Hills, Michigan, USA, the American Concrete Institute is a leading authority and resource worldwide for the development, dissemination, and adoption of its consensus-based standards, technical resources, educational programs, and proven expertise for individuals and organizations involved in concrete design, construction, and materials, who share a commitment to pursuing the best use of concrete.
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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: A Study of Hooked Bar Anchorages in Beam-Column Joints
Author(s): Jose L. G. Marques and James O. Jirsa
Publication: Journal Proceedings
Appears on pages(s): 198-209
Keywords: anchorage (structural);beam-column frames;beams (supports);hooked reinforcement; joints (junctions);freinforced concrete;structural engineering.
Abstract: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 comforming to ACI 318-71 specifications were used throughout. Based on oberservations of the test specimens, current ACI 318-71 Code specifications are studied and design recomendations for hooked bar anchorages proposed. Comparisions of the design recommendations with the measured results indicate 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 sufficant.
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