Minimum Joint Depth for Moment Frames with High-Strength Materials
Issue Date
2023-01-01Author
Lee, Hung-Jen
Lequesne, Rémy D.
Lepage, Andrés
Lin, Jian-Xing
Wang, Jui-Chen
Yin, S. Y.-L.
Publisher
American Concrete Institute
Type
Article
Article Version
Scholarly/refereed, publisher version
Rights
Copyright © 2023, American Concrete Institute. All rights reserved, including the making of copies unless permission is obtained from the copyright proprietors. Pertinent discussion including author’s closure, if any, will be published ten months from this journal’s date if the discussion is received within four months of the paper’s print publication.
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Show full item recordAbstract
This paper reports results from four large-scale interior beam column connections without transverse beams or slabs tested under reversed cyclic displacements. The specimens, which included the first of interior beam-column connections constructed with Grade 100 (690) reinforcement with bar deformations similar to those available in U.S. practice, had Grade 60 or 100 (420 or 690) bars, 4 or 10 ksi (28 or 69 MPa) concrete, and varied column depthto-beam bar diameter ratios. The specimens all exhibited strengths greater than the nominal strength, retained at least 80% of their strength to drift ratios exceeding 5%, and exceeded ACI 374 acceptance criteria at a 3% drift ratio for components of special moment frames, demonstrating that well-detailed joints constructed with high-strength materials behave satisfactorily. The data add evidence that joints constructed with high-strength concrete exhibit less bond decay, and recommendations are made for accounting for this effect in design. Results from the specimen constructed with normal-strength materials, considered in the context of prior tests, suggest a need to increase the minimum joint depth for special moment frames. Considerable improvement in behavior associated with reduced bond damage within the joint is obtained from a 20% increase in the minimum column depth-to-beam bar diameter ratio required in ACI 318-19.
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Citation
H.-J. Lee, R. D. Lequesne, A. Lepage, J.-X. Lin, J.-C. Wang, and S. Y.-L. Yin. Minimum Joint Depth for Moment Frames with High- Strength Materials. ACI Structural Journal. Vol. 120, Iss 1, (Jan 2023): 225-239. https://doi.org/10.14359/51737141
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