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.
References
AFPA-AWC (American Forest and Paper Association American Wood Council). 1999. General dowel equations for calculating lateral connection values. Washington, DC: American Forest and Paper Association American Wood Council.
ANSI/APA. 2017. Standard for performance-rated cross-laminated timber. ANSI/APA PRG320. Tacoma, WA: ANSI/APA.
ASTM. 2009. Standard test method for dynamic young’s modulus, shear modulus, and Poisson’s ratio by impulse excitation of vibration. ASTM E1876-09. West Conshohocken, PA: ASTM International.
ASTM. 2017. Standard test method for determining bending yield moment of nails. ASTM F1575-17. West Conshohocken, PA: ASTM International.
Ceccotti, A., M. Follesa, and M. P. Lauri. 2006. “Sofie project: Test results on the lateral resistance of cross-laminated wooden panels.” In Proc., 1st European Conf. on Earthquake Engineering and Seismology. Istanbul, Turkey: European Association of Earthquake Engineering.
Folz, B., and F. B. Filiatrault. 2001. “Cyclic analysis of wood shear walls.” J. Struct. Eng. 127 (4): 433–441. https://doi.org/10.1061/(ASCE)0733-9445(2001)127:4(433).
Foschi, R. O., and J. Longworth. 1975. “Analysis and design of griplam nailed connections.” J. Struct. Div. 101 (ST12): 2537–2555.
FPL (Forest Products Laboratory). 2010. Wood handbook, wood as an engineering material. Madison, WI: USDA Forest Products Laboratory.
Hong, J.-P., and D. Barrett. 2010. “Three-dimensional finite-element modeling of nailed connections in wood.” J. Struct. Eng. 136 (6): 715–722. https://doi.org/10.1061/(ASCE)ST.1943-541X.0000160.
Igor, G. 2013. “Seismic behaviour of cross-laminated timber buildings: Numerical modelling and design provisions.” In COST Action FP1004 Conf. Focus Solid Timber Solutions–European Conference on Cross Laminated Timber (CLT). Bath, UK: Univ. of Bath.
Johansen, K. W. 1949. Theory of timber connections., 249–262. Bern, Switzerland: International Association of Bridge and Structural Engineering.
Kent, S. M., R. Leichti, D. V. Rosowsky, and J. J. Morrell. 2004. “Effects of wood decay by Postia placenta on the lateral capacity of nailed oriented strandboard sheathing and Douglas-fir framing members.” Wood Fiber Sci. 36 (4): 560–572.
Larkin, B. 2017. Effective bonding parameters for hybrid cross-laminated timber (CLT). M.Sc. dissertation, Oregon State Univ.
Mahdavifar, V. 2017. “Cyclic performance of connections used in hybrid cross-laminated timber.” Ph.D. dissertation, Oregon State Univ.
Mahdavifar, V., A. R. Barbosa, L. Muszynski, R. Gupta, and A. Sinha. 2016a. “Hysteretic behaviour of metal connectors for hybrid (high- and low-grade mixed species) cross laminated timber.” In Proc., WCTE 2016—World Conf. on Timber Engineering, Vienna, Austria: Vienna Univ. of Technology.
Mahdavifar, V., A. R. Barbosa, and A. Sinha. 2016b. “Nonlinear layered modelling approach for cross-laminated timber panels subjected to out-of-plane loading.” In Proc., 41st IAHS World Congress Sustainability and Innovation for the Future, Miami: International Association for Housing Science.
Meyer, A. 1957. “Die Tragfaehigkeit von nagelverbindungen bei statischer belastung.” Holz als Roh-und Werkstoff 15 (2): 96–109. https://doi.org/10.1007/BF02609174.
Mohammad, M., B. Douglas, D. R. Rammer, and S. E. Pryor. 2013. “Chapter 5: Connection in cross-laminated timber buildings.” In CLT handbook: Cross laminated timber. 1st ed. Washington, DC: USDA Forest Service Binational Wood Council.
Moller, T. 1950. En ny metod för beräkning av spikförband: New method of estimating the bearing strength of nailed wood connections. Gothenburg, Sweden: Chalmers Univ. of Technology.
Muñoz, W., S. Gagnon, and M. Mohammad. 2010. “Lateral and withdrawal resistance of typical CLT connections.” In Proc., WCTE 2010: World Conf. on Timber Engineering. Trentino, Italy: National Research Council of Italy, Trees and Timber Institute.
NDS (National Design Specification). 2015. National design specification for wood construction. Washington, DC: American Forest and Paper Association.
SAE (Society of Automotive Engineers). 2014. Chemical compositions of SAE carbon steels. SAE J403-201406. Warrendale, PA: SAE International.
Santos, C. L., A. M. De Jesus, J. J. Morais, and J. L. Lousada. 2009. “Quasi-static mechanical behaviour of a double-shear single dowel wood connection.” Constr. Build. Mater. 23 (1): 171–182. https://doi.org/10.1016/j.conbuildmat.2008.01.005.
Seaders, P., R. Gupta, and T. H. Miller. 2009. “Monotonic and cyclic load testing of partially and fully anchored wood-frame shear walls.” Wood Fiber Sci. 41 (2): 145–156.
Shen, Y.-L., J. Schneider, S. Tesfamariam, S. F. Stiemer, and Z.-G. Mu. 2013. “Hysteresis behavior of bracket connection in cross-laminated timber shear walls.” Constr. Build. Mater. 48: 980–991. https://doi.org/10.1016/j.conbuildmat.2013.07.050.
Sinha, A., R. Gupta, and J. A. Nairn. 2011. “Thermal degradation of lateral yield strength of nailed wood connections.” J. Mater. Civ. Eng. 23 (6): 812–822. https://doi.org/10.1061/(ASCE)MT.1943-5533.0000233.
Trayer, G. W. 1932. The bearing strength of wood under bolts. Washington, DC: US Dept. of Agriculture.
Uibel, T., and H. J. Blass. 2006. Load carrying capacity of joints the dowel type fasteners in solid wood panels. In Proc., 39th Meeting of the Working Commission W18-Timber Structures. Florence, Italy: International Council for Research and Innovation in Building and Construction.
Yeh, M., B. Wang, and K. Wu. 2007. “Tensile strength of bolt joints for structural glulam members made of Japanese cedar.” Taiwan J. Sci. 22 (2): 101–111.
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©2018 American Society of Civil Engineers.
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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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