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Procedures for developing allowable properties for a single species under ASTM D1990 and computer programs useful for the calculationsAuthor(s): James W. Evans; David E. Kretschmann; Victoria L. Herian; David W. Green
Source: Gen. Tech. Rep. FPL-GTR-126. Madison, WI: U.S. Department of Agriculture, Forest Service, Forest Products Laboratory. 42 p.
Publication Series: General Technical Report (GTR)
Station: Forest Products Laboratory
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DescriptionASTM D1990, “Establishing Allowable Properties for Visually Graded Dimension Lumber from In-Grade Tests of Full-Size Specimens,” is the consensus standard used to make submissions of allowable properties for many U.S., Canadian, and foreign species to the Board of Review of the American Lumber Standards Committee. Recently, it has become apparent how difficult it is to perform the calculations for such a submission. Some calculations are clearly specified in the standard; in some cases the standard merely indicates a need to make an adjustment but does not specify how to do so. This report discusses in detail how to develop allowable properties under the standard in a manner that is consistent with current practice. Many calculations in the standard are difficult and errors are easily made, particularly when using a spreadsheet; this report introduces a set of computer programs that perform some of the difficult calculations, thereby reducing the potential for errors. These computer programs can be run over the World Wide Web, or Fortran versions of the programs can be downloaded, compiled, and run on a user’s computer.
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CitationEvans, James W.; Kretschmann, David E.; Herian, Victoria L.; Green, David W. 2001. Procedures for developing allowable properties for a single species under ASTM D1990 and computer programs useful for the calculations. Gen. Tech. Rep. FPL-GTR-126. Madison, WI: U.S. Department of Agriculture, Forest Service, Forest Products Laboratory. 42 p.
KeywordsAllowable properties, computer program, ASTM D1990, moisture adjustment, strength ratios, In-Grade
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