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    Author(s): Fred Werren
    Date: 1975
    Source: Gen. Tech. Rep. FPL-05. Madison, WI: U.S. Department of Agriculture, Forest Service, Forest Products Laboratory. 6 p.
    Publication Series: General Technical Report (GTR)
    Station: Forest Products Laboratory
    PDF: View PDF  (44 KB)

    Description

    A standard for portable wood ladders has been in effect since 1923, and has been revised several times since then. The most recent publication is "American National Standard Safety Standard for Portable Wood Ladders," A14.1-1975, from American National Standards Institute, Inc. Methods of arriving at allowable stresses for wood ladder parts have never been clearly documented. This report out lines what was done in the latest revision of the standard to calculate allowable fiber stresses for establishing species groupings.

    Publication Notes

    • We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
    • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.

    Citation

    Werren, Fred. 1975. Allowable bending stresses of wood for use in portable wood ladders. Gen. Tech. Rep. FPL-05. Madison, WI: U.S. Department of Agriculture, Forest Service, Forest Products Laboratory. 6 p.

    Keywords

    Safety, ladders, strength, bending stress, grading, knots, strength of wood, bending

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