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Conventional and High-Strength Hooked Bars: Detailing Effects
Sperry, Jayne Darwin, David O’Reilly, Matthew Lepage, Andrés Lequesne, Rémy D. Matamoros, Adolfo B. Feldman, Lisa Yasso, Samir Searle, Nathaniel DeRubeis, Michael
Sperry, Jayne
Darwin, David
O’Reilly, Matthew
Lepage, Andrés
Lequesne, Rémy D.
Matamoros, Adolfo B.
Feldman, Lisa
Yasso, Samir
Searle, Nathaniel
DeRubeis, Michael
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Abstract
Findings from a study on the effect of hook bend angle, concrete clear cover, and orientation of confining reinforcement on hook anchorage strength are presented. The range of test parameters was much broader than in previous studies. Bar stress at anchorage failure ranged from 33,000 to 137,400 psi (228 to 947 MPa) and concrete compressive strengths ranged from 4300 to 16,500 psi (30 to 114 MPa). Anchorage strength of hooked bars was insensitive to bend angle (90 or 180 degrees) and side cover (between 2.5 and 3.5 in. [65 and 90 mm]). Confining reinforcement was found to increase anchorage strength for 180-degree hooked bars regardless of orientation (parallel or perpendicular to the embedment length). For 90-degree hooked bars, reinforcement oriented parallel to the embedment length had a greater effect on anchorage strength than reinforcement oriented perpendicular to the embedment length.
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Date
2018-01-01
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Publisher
American Concrete Institute
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Research Projects
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Keywords
anchorage, beam-column joints, bond, development length, high-strength concrete, high-strength steel, hook bend angle, reinforced concrete, side cover
Citation
Sperry, J. Darwin, D. O'Reilly, M. Lepage, A. Lequesne, R. D., Matamoros, A. Feldman, L. Yasso, S. Searle, N. DeRubeis, M. & Ajaam, A. (2018). Conventional and High-Strength Steel Hooked Bars: Detailing Effects. ACI Structural Journal, 115(1), 248-258.