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  1. Effect of drilled holes on the bending strength of large dimension Douglas-fir lumber

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    Author(s): R.H. Falk; D. DeVisser; G.R. Plume; K.J. Fridley
    Date: 2003
    Source: Forest products journal. Vol. 53, no. 5 (May 2003)
    Publication Series: Miscellaneous Publication
    PDF: Download Publication  (210 KB)

    Description

    In this study, experimental bending tests were performed on nominal 4-by 8-inch (actual 89-mm by 191-mm)lumber members to determine how a notch and holes drilled in the wide face affect edge wise bending strength. Holes were drilled at the midspan in three locations relative to the edge. The results appear to justify an allowable hole one-half the allowable knot size that is currently permitted for cedar in No. 1 Beams & Stringer grade. Furthermore, the data indicate that hole location may be as important as hole size. A1-inch (25.4-mm)hole had about the same effect on strength as a 1-3/4-inch (44-mm) hole when the holes were 1 inch (25.4 mm)from the tension edge.

    Publication Notes

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    • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.

    Citation

    Falk, R.H.; DeVisser, D.; Plume, G.R.; Fridley, K.J. 2003. Effect of drilled holes on the bending strength of large dimension Douglas-fir lumber. Forest products journal. Vol. 53, no. 5 (May 2003)

    Keywords

    Drilled holes, bending strength, Douglas-fir, lumber, strength

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