Volume 30, Issue 4 (July 2002)

    Finite-Element Analysis of the Stress Distribution in a Torsion Test of Full-Size, Structural Lumber

    (Received 18 September 2001; accepted 20 March 2002)

    CODEN: JTEOAD

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    Abstract

    Full-size structural lumber under torsion was analyzed using the finite-element method to determine stress distribution. A three-dimensional, homogeneous, orthotropic finite-element model was developed and analyzed using commercially available software, ANSYS®, to increase understanding of stress distribution and failure modes. Analyses revealed that uniform shear stress occurs within the shear span, which begins and ends at a distance of approximately two times the depth plus the grip distance away from each end of the specimen. In addition, finite-element analysis verified that the experimental shear-failure plane that occurs within the shear span is parallel to the grain. Shear slippage is also parallel to the grain, similar to the known shear-failure mode in specimens subjected to transverse loads. Based on results of this study, the torsion test is the best practical method to determine the pure shear strength of full-size, structural lumber.


    Author Information:

    Gupta, R
    Associate professor, Oregon State University, Corvallis, OR

    Heck, LR
    Designer, Degenkolb Engineers, Inc., Portland, OR

    Miller, TH
    Associate professor, Oregon State University, Corvallis, OR


    Stock #: JTE12319J

    ISSN: 0090-3973

    DOI: 10.1520/JTE12319J

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    Author
    Title Finite-Element Analysis of the Stress Distribution in a Torsion Test of Full-Size, Structural Lumber
    Symposium , 0000-00-00
    Committee D07