Lateral and Withdrawal Capacity of Fasteners on Hybrid Cross-Laminated Timber Panels
Publication: Journal of Materials in Civil Engineering
Volume 30, Issue 9
Abstract
Cross-laminated timber (CLT) is an orthogonally laminated timber panel product made using dimensional lumber. It is gaining traction in the construction industry, as is evident by the increasing number projects using CLT. Currently, CLT panels are manufactured using single species of wood; however, as the product matures, several combinations of species/grades layups may be used to optimize the properties and achieve economic efficiency. The panels using these different combinations of species and grades are called hybrid CLT. For successful integration as a new panel layup in the CLT market, the performance of different connections using the hybrid layup of panels needs to be evaluated. Because hybrid CLT panels can possibly use materials of different densities into which the fasteners embed, fastener performance needs to be characterized according to the existing density profile. A series of laboratory tests are performed to obtain the performance of two different fastener types (a screw and a nail) on seven different layups to provide quantitative information about the performance of single fasteners used for common connection system. Additionally, the existing analytical models for predicting fastener performance under loading are adjusted to account for potential density profiles in hybrid CLT panel applications, and the results are compared to experimental results. Marked effects of face-layer density on the performance of the fasteners under lateral and withdrawal loading are captured. Neither yield mode nor the strengths of the fasteners are affected significantly. Results suggest that the adjusted models can be used to account for the effect of varying density.
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Acknowledgments
The authors acknowledge the US Department of Agriculture (USDA) and National Institute of Food and Agriculture (NIFA) for providing funding that supported the project under which this study was executed through USDA/NIFA Grants Program 10.200 (Grant No. 2013-34638-21482). In addition, the authors acknowledge many undergraduate students and interns for giving aid throughout the testing programs. to the authors give a special thank you to Blake Larkin, Milo Clauson, Adra Gullidge, Amy McKee, and Jasmin Rainer. The opinions and findings presented are those of the authors and do not reflect any endorsement of the funding agency.
Disclaimer
The adjusted equations were validated by the parameters of the current experiment design. Future studies should include using other densities and fasteners combinations.
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Published In
Journal of Materials in Civil Engineering
Volume 30 • Issue 9 • September 2018
Copyright
©2018 American Society of Civil Engineers.
History
Received: Oct 26, 2017
Accepted: Mar 20, 2018
Published online: Jul 2, 2018
Published in print: Sep 1, 2018
Discussion open until: Dec 2, 2018
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