Material Variability and Repetitive Member Factors for the Allowable Properties of Engineered Wood Products

    Volume 37, Issue 6 (November 2009)

    ISSN: 0090-3973

    CODEN: JTEOAD

    Published Online: 24 July 2009

    Page Count: 9


    Verrill, Steve
    Mathematical Statistician, U.S. Dept. of Agriculture Forest Products Laboratory, Madison, WI

    Kretschmann, David E.
    Research General Engineer, U.S. Dept. of Agriculture Forest Products Laboratory, Madison, WI

    (Received 1 July 2008; accepted 10 June 2009)

    Abstract

    It has been argued that repetitive member allowable property adjustments should be larger for high-variability materials than for low-variability materials. We report analytic calculations and simulations that suggest that the order of such adjustments should be reversed, that is, given the manner in which allowable properties are currently calculated, as the coefficient of variation of the strength distribution of individual elements increases, the upward repetitive member adjustments (if any) of assemblies constructed from these elements should decrease.


    Paper ID: JTE101924

    DOI: 10.1520/JTE101924

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    Author
    Title Material Variability and Repetitive Member Factors for the Allowable Properties of Engineered Wood Products
    Symposium , 0000-00-00
    Committee D07