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    Author(s): Steve Verrill; David E. Kretschmann
    Date: 2009
    Source: Journal of testing and evaluation. Vol. 37, no. 6 (2009): p. 1-9. Paper ID JTE101924.
    Publication Series: Miscellaneous Publication
    PDF: Download Publication  (308.26 KB)


    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.

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    Verrill, Steve; Kretschmann, David E. 2009. Material variability and repetitive member factors for the allowable properties of engineered wood products. Journal of testing and evaluation. Vol. 37, no. 6 (2009): p. 1-9. Paper ID JTE101924.


    Engineered wood, mechanical properties, lumber, elasticity, mathematical statistics, bending, reliability, computer simulation, loads, probability measures, simulation methods, strength, stiffness, coefficients of variation, COV, statistical analysis, bending strength, D5055 standard, repetitive member factors

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