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Would you like to add information to this article? Interested in writing or submitting an article? Have a question about this article? 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. 2003 This article is in PDF format (file size: 214 kb). To download this article, right click on the link immediately below and choose "save target as". To view the article, left click the link immediately below. (Download the latest Acrobat Reader if required.) Effect of drilled holes on the bending strength of large dimension Douglas-fir lumber   (2003) 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. Author: Falk, R.H.; DeVisser, D.; Plume, G.R.; Fridley, K.J. Source: Forest products journal. Vol. 53, no. 5 (May 2003) Citation: Falk, R.H.; DeVisser, D.; Plume, G.R.; Fridley, K.J.  2003.  Effect of drilled holes on the bending strength of large dimension Douglas-fir lumber  Forest products journal. Vol. 53, no. 5 (May 2003). Have you reviewed the related Knowledge Base areas below? KnowledgeBase: FPL (Forest Products Laboratory) KnowledgeBase: Forestry KnowledgeBase: FPL (Forest Products Laboratory) Would you like to add information to this article? ... Click Here If you have a question regarding a Knowledge Base article, your best chance at uncovering an answer is to search the entire Knowledge Base for related articles or to post your question at the appropriate WOODWEB Forum. Before posting your message, be sure to review our Forum Guidelines. Questions entered in the Knowledge Base Article comment form will not generate responses! A list of WOODWEB Forums can be found at WOODWEB's Site Map. When you post your question at the Forum, be sure to include references to the Knowledge Base article that inspired your question. The more information you provide with your question, the better your chances are of receiving responses. Return to beginning of article. Refer a Friend || Read This Important Information || Site Map || Privacy Policy Letters, questions or comments? E-Mail us and let us know what you think. Be sure to review our Frequently Asked Questions page. Contact us to discuss advertising or to report problems with this site. To report a problem, send an e-mail to our Webmaster Copyright © 1996-2008 - WOODWEB ® Inc. All rights reserved. No part of this publication may be reproduced in any manner without permission of the Editor. Review WOODWEB's Copyright Policy. The editors, writers, and staff at WOODWEB try to promote safe practices. What is safe for one woodworker under certain conditions may not be safe for others in different circumstances. Readers should undertake the use of materials and methods discussed at WOODWEB after considerate evaluation, and at their own risk. WOODWEB, Inc. RR4 Box 265A Montrose, PA 18801 Contact WOODWEB