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Conventional and High-Strength Hooked Bars—Part 2: Data Analysis
Sperry, Jayne Darwin, David O’Reilly, Matthew Lequesne, Rémy D. Yasso, Samir Feldman, Lisa Lepage, Andrés
Sperry, Jayne
Darwin, David
O’Reilly, Matthew
Lequesne, Rémy D.
Yasso, Samir
Feldman, Lisa
Lepage, Andrés
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Abstract
Empirical equations are developed to characterize the anchorage strength of hooked bars. The equations are based on tests of 245 simulated beam-column joint specimens with two hooked bars: 146 with confining reinforcement and 99 without. Bar stresses at failure for specimens used in the analysis ranged from 30,800 to 144,100 psi (212 to 994 MPa), and concrete compressive strengths ranged from 2570 to 16,200 psi (17.7 to 112 MPa). For the specimens analyzed, hooked bar anchorage strength was proportional to concrete compressive strength raised to the 0.29 power. For confining reinforcement parallel to and located within eight or 10 bar diameters of the straight portion of the hooked bar, the contribution to anchorage strength was proportional to the area of confining reinforcement; for confining reinforcement perpendicular to the straight portion of the bar, more legs of the confining reinforcement contributed to anchor strength, but each leg made a smaller contribution.
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Date
2017-01-01
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American Concrete Institute
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Darwin_2017.pdf
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Keywords
Anchorage, Beam-column joints, Bond and development, Highstrength concrete, High-strength steel, Hooks, Reinforcement
Citation
Sperry, J., Darwin, D., O'Reilly, M., Lequesne, R.D.,Yasso, S., Matamoros, A., Feldman, L.R.,and Lepage, A., "Conventional and High-Strength Hooked Bars - Part 2: Data Analysis," ACI Structural Journal, Vol. 114, No. 1, January-February 2017, pp. 267-314.