Quasi-Static Strengths and Failure Modes of Tight-Fitting and Round-End Metal-Plate Wooden Truss Joints
Publication: Journal of Structural Engineering
Volume 134, Issue 6
Abstract
An experimental study was conducted to investigate whether existing industry design procedures for tight-fitting metal plate connector truss joints can be applied to the design of joints made with round-end webs. Four joint configurations were tested with a range of connector-plate sizes: 45° with web in tension, 45–45° with one web in compression and the other in tension, 45–90° with the 45° web in compression and the 90° web in tension, and 45° with the web under compression. In total, 87 tight-fitting and 171 round-end joints were tested. As expected the tight-fitting joints were stronger and stiffer than round-end joints. Both the shear strength of the metal plate connector and the teeth pullout strength were smaller in the round-end joints than in the tight-fitting joints. The line contacts between the round-end webs in compression produced greater crushing of the wood, causing buckling of the connector plates, and reducing the ultimate loads on these joints. Design guidelines are suggested for round-end joints.
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Acknowledgments
The research was funded by a grant from Tembec Inc. and the Natural Sciences and Engineering Research Council of Canada. The support of Tembec Inc. and Jager Building Systems is gratefully acknowledged, particularly the contributions of Dr. William Love, Brian Hintz, Marko Merhar, and Adam Gramenz. The experiments were conducted at Engineering Material Research with the expert assistance of Dr. Allan Hull.
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 134 • Issue 6 • June 2008
Pages: 1046 - 1056
Copyright
© 2008 ASCE.
History
Received: Feb 6, 2007
Accepted: Jul 1, 2007
Published online: Jun 1, 2008
Published in print: Jun 2008
Notes
Note. Associate Editor: Rakesh Gupta
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