Journal Published Online: 04 December 2020
Volume 49, Issue 6

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

CODEN: JTEVAB

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, USA
Bernhardt, Butch
Western Wood Preservers Institute, Vancouver, WA, USA
Brooks, Dallin
Western Wood Preservers Institute, Vancouver, WA, USA
Sinha, Arijit
Department of Wood Science and Engineering, Oregon State University, Corvallis, OR, USA
Morrell, Jeffrey J.
National Centre for Timber Durability and Design Life, University of the Sunshine Coast, Mail Station ML8, Brisbane, Australia
Pages: 12
Price: $25.00
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Stock #: JTE20200308
ISSN: 0090-3973
DOI: 10.1520/JTE20200308