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    Diagonally Reinforced Concrete Coupling Beams: Effects of Axial Restraint

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    2021 Poudel, Ameen, Lequesne, Lepage; Diagonally Reinforced Concrete Coupling Beams Effects of Axial Restraint.pdf (2.799Mb)
    Issue Date
    2021-11
    Author
    Poudel, Ashwin
    Ameen, Shahedreen
    Lequesne, Rémy D.
    Lepage, Andrés
    Publisher
    American Concrete Institute
    Type
    Technical Report
    Rights
    Copyright © 2021, 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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    Abstract
    Two pairs of nominally identical large-scale coupling beam specimens were tested under reversed cyclic displacements. Within each pair, one specimen was free to elongate and the other had resistance to elongation during testing. The specimens had clear span-to-overall-depth ratios of 1.9, a nominal concrete compressive strength of 6000 psi (42 MPa), Grade 60 or 120 (420 or 830) diagonal bars, and nominal shear stresses near the ACI Building Code (ACI 318) limit of 10√fc′ psi (0.83√fc′ MPa). Passive axial restraint resulted in beam axial forces and was correlated with higher coupling beam strength, lower chord rotation capacity, earlier diagonal bar buckling, and greater damage. The importance of these effects increased with the magnitude of the induced axial force. The ACI equation for coupling beam nominal strength (based on the area, yield stress, and inclination of diagonal bars) underestimated beam strength by up to 80%, whereas estimates based on flexural strength were substantially more accurate and allowed consideration of axial force effects.
    URI
    http://hdl.handle.net/1808/32695
    DOI
    https://doi.org/10.14359/51732991
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    • Civil, Environmental & Architectural Engineering Scholarly Works [117]
    Citation
    Poudel, A., Ameen, S., Lequesne, R.D., Lepage, A., (2021). "Diagonally Reinforced Concrete Coupling Beams: Effects of Axial Restraint". ACI Structural Journal, vol. 118, no. 6. pp. 293-303. DOI: 10.14359/51732991

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    Contact KU ScholarWorks
    785-864-8983
    KU Libraries
    1425 Jayhawk Blvd
    Lawrence, KS 66045
    785-864-8983

    KU Libraries
    1425 Jayhawk Blvd
    Lawrence, KS 66045
    Image Credits
     

     

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