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Title: Effect of drilled holes on the bending strength of large dimension Douglas-fir lumber

Source: Forest products journal. Vol. 53, no. 5 (May 2003)

Author(s)Falk, R.H.; DeVisser, D.; Plume, G.R.; Fridley, K.J.

Publication Year: 2003  View PDF »

Related Publications: view

Category: Journal Articles

Abstract: In this study, experimental bending tests were performed on nominal 4-by 8-inch (actual 89-mm by 191-mm)lumber members to determine how a notch and holes drilled in the wide face affect edge wise bending strength. Holes were drilled at the midspan in three locations relative to the edge. The results appear to justify an allowable hole one-half the allowable knot size that is currently permitted for cedar in No. 1 Beams & Stringer grade. Furthermore, the data indicate that hole location may be as important as hole size. A1-inch (25.4-mm)hole had about the same effect on strength as a 1-3/4-inch (44-mm) hole when the holes were 1 inch (25.4 mm)from the tension edge.

Keywords: Drilled holes, bending strength, Douglas-fir, lumber, strength

File size: 210 kb(s)

This publication is also viewable on Treesearch:  view
RITS Product ID: 13327
Current FPL Scientist associated with this product
Falk, Robert H.
Research General Engineer
  

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