Effect of drilled holes on the bending strength of large dimension Douglas-Fir lumber
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.
Civil and Environmental Engineering | Civil Engineering | Environmental Engineering | Environmental Health and Protection | Environmental Monitoring | Environmental Sciences | Natural Resources Management and Policy
Use Find in Your Library, contact the author, or interlibrary loan to garner a copy of the item. Publisher policy does not allow archiving the final published version. If a post-print (author's peer-reviewed manuscript) is allowed and available, or publisher policy changes, the item will be deposited.
Falk, R. H.,
Plume, G. R.,
Fridley, K. J.
Effect of drilled holes on the bending strength of large dimension Douglas-Fir lumber.
Forest Products Journal, 53(5),