Volume 26, Issue 5 (September 1998)

    Qualitative Assessment of Failure in Bolted Connections: Tsai-Wu Criterion

    (Received 8 April 1997; accepted 5 March 1998)

    CODEN: JTEOAD

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    Abstract

    In a companion paper, a characterization is presented of stress fields in a single-shear bolted connection subjected to tension loading. Numerous stress contours are presented that illustrate the magnitude of the parallel-to-grain compression and shear stresses, as well as the perpendicular-to-grain tension stresses. In addition, regions of potential failure in the selected specimens are identified based on a maximum stress failure criterion.

    The work presented in this paper represents additional efforts to identify the effect of stress interactions on the strength of the previously mentioned connections. The Tsai-Wu criterion, quantified by its failure index, is used as the tool to identify stress interactions between the aforementioned stress components. Connection geometries similar to those discussed in the companion paper [end distance/bolt diameter (ed)=4; and length of bolt in main member/bolt diameter (aspect ratio) (ld)=2,5,and7] are studied. In addition, several other geometries are discussed that illustrate the effects of changing aspect ratio and end distance.

    A number of significant findings are reached in this study. As is the case in the companion study, all connections with (ld)=2 have nearly uniform distributions of the Tsai-Wu failure index (FI) through the specimen thickness. No significant pin bending is associated with this geometry. Connections with ld>4 have a failure mode (interpreted from the numerical model) that includes substantial pin bending due to steel yielding, wood crushing, and localized cracking.


    Author Information:

    Patton-Mallory, M
    Assistant director, USDA,

    Pellicane, PJ
    Professor of wood engineeringprofessor of mechanical engineering, Colorado State University, Fort,

    Smith, FW
    Professor of wood engineeringprofessor of mechanical engineering, Colorado State University, Fort,


    Stock #: JTE12694J

    ISSN: 0090-3973

    DOI: 10.1520/JTE12694J

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    Author
    Title Qualitative Assessment of Failure in Bolted Connections: Tsai-Wu Criterion
    Symposium , 0000-00-00
    Committee D07