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    Volume 49, Issue 6 (December 2020)

    Modeling Effects of Incising on Flexural Properties of Green Douglas Fir and Western Hemlock Lumber

    (Received 13 May 2020; accepted 16 July 2020)

    Published Online: 04 December 2020

    CODEN: JTEVAB

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    Abstract

    Incising is required in Canadian and US national standards for the treatment of many timber species, especially those from western North America. Incising increases the amount of end-grain exposed to fluid flow, but it also decreases the cross-sectional area and, thus, has the potential to affect mechanical properties. Models have been developed to predict the effects of incising on flexural properties, but correlative data for engineering design adjustment factor(s) for incised and preservative treated lumber and timber are lacking. Current engineering design adjustment factors are primarily based on nominal 2x (38-mm, 1.5-in)-thick lumber tests. In 2018, this fact was recognized and the new design standard allowed for theoretical models to be used for larger materials where appropriate test data were not currently available. This article reports the results of mechanical tests evaluating the effects of incising on flexural properties of nominal 3x and 4x (64- and 89-mm)-thick by 184-mm (7.25-in)-wide Douglas fir and western hemlock lumber. It uses these data to develop potential engineering design adjustment factor(s) for incised nominal 2x (64- and 89-mm)-thick lumber and discusses theoretical modeling to predict those factors.

    Author Information:

    Winandy, Jerrold E.
    Department of Bioproducts and Bioscience Engineering, Kaufert Laboratory, University of Minnesota, St. Paul, MN

    Bernhardt, Butch
    Western Wood Preservers Institute, Vancouver, WA

    Brooks, Dallin
    Western Wood Preservers Institute, Vancouver, WA

    Sinha, Arijit
    Department of Wood Science and Engineering, Oregon State University, Corvallis, OR

    Morrell, Jeffrey J.
    National Centre for Timber Durability and Design Life, University of the Sunshine Coast, Mail Station ML8, Brisbane,


    Stock #: JTE20200308

    ISSN:0090-3973

    DOI: 10.1520/JTE20200308

    Author
    Title Modeling Effects of Incising on Flexural Properties of Green Douglas Fir and Western Hemlock Lumber
    Symposium ,
    Committee D07