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Allowable bending stresses of wood for use in portable wood laddersAuthor(s): Fred Werren
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
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DescriptionA 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.
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CitationWerren, 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.
KeywordsSafety, ladders, strength, bending stress, grading, knots, strength of wood, bending
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