Aydin DEMIR, Cenk DEMIRKIR, Ismail AYDIN

THE EFFECTS OF WOOD SPECIES, NAIL SIZE, GRAIN DIRECTION AND LAYER NUMBERS ON LATERAL NAIL STRENGTH OF STRUCTURAL PLYWOOD PANELS

In the use of solid wood and wood-based composite materials in wooden structures, metal elements such as nails, screws and bolts are used as fasteners. The strength of the connection points depends on many factors. In this study, it was aimed to determine effects of wood species, nail size, grain direction and layer numbers on lateral nail strength of structural plywood panels. Scots pine, black pine and spruce were used as wood species for structural plywood production. Five and seven-ply plywood panels, 10 mm and 14 mm thick, were manufactured by using phenol formaldehyde glue resin. Lateral nail strength test was performed according to ASTM D1761. The specimens were oriented so that the load was applied parallel and perpendicular to the grain of the main axis of plywood panel during the test. Also, nail size was chosen as 6d and 8d for test. As a result of the study, it was seen that the Scots pine plywood gave the highest lateral nail strength values among other wood species. Lateral nail strength values of seven-ply plywood was found higher than five-ply plywood. Lateral nail strength value of the samples using 8d nails was found to be higher than those using 6d nails. Also, it was determined the lateral nail strength values in perpendicular to grain were higher than those in parallel to grain.

Keywords:

Lateral nail strength, structural plywood nail size, grain direction, layer numbers,

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[1] Bal B. C., (2017). Screw and nail holding properties of plywood panels reinforced with glass fiber fabric, Cerne, 23, 1, 11-18.
[2] Bal B.C. and Bektas I., (2014). Some mechanical Properties of Plywood Produced from Eucalyptus, Beech, and Poplar Veneer, Maderas. Ciencia y tecnología, 16(1), 99-108.
[3] Nagase K., Kobayashi K. and Yasumura M., (2018). Estimation of failure lifetime in plywood-to-timber joints with nails and screws under cyclic loading, Journal of Wood Science, 64, 5, 612-624.
[4] Nanami N., Shibusawa T., Sato M., Arima T. and Kawai M., (2000). Durability assessment of wood-framed walls and mechanical properties of plywood in use, in Proceedings of the World Conference on Timber Engineering”, British Columbia, University of British Columbia.
[5] Demir A., Demirkir C. and Aydin I., (2019). The Effect of Some Technological Properties of Plywood Panels on Seismic Resistant Performance of Wooden Shear Wall, Sigma, 10, 1, 37-45.
[6] Rammer D. R., (2010). Fastenings. Wood handbook: wood as an engineering material: chapter 8. Centennial ed. General technical report FPL; GTR-190. Madison, WI: US Dept. of Agriculture, Forest Service, Forest Products Laboratory, p. 8.1-8.28., 190, 8-1.
[7] McCormick T.P., (2005). Seismic retrofit training for building contractors & ınspectors. Shear walls. Publisher: Timothy P. McCormick, ISBN: N\A, edition 2005.
[8] Bott J.W., (2005). Horizontal Stiffness of Wood Diaphragms. Master of Science in Civil Engineering. Virginia Polytechnic Institute and State University. Blacksburg, Virginia.
[9] Demirkir C. and Colakoglu G., (2015). The effect of grain direction on lateral nail strength and thermal conductivity of structural plywood panels. Maderas. Ciencia y tecnología, 17, 3, 469-478.
[10] EN 323, (1993). Wood-based panels. Determination of density. European Standard, Belgium.
[11] American Society for Testing and Materials. ASTM, (2006). Standard Test Methods for Mechanical Fasteners in Wood, ASTM D 1761-06, West Conshohocken, United States.
[12] Pirvu C., (2008). Structural Performance of Wood Diaphragms with Thick Panels. Canadian Forest Service No. 13, Final report. FPInnovations Forintek, March.
[13] Bal B.C. and Bektaş I., (2013). Flexural Properties of Plywood Produced From Beech, Poplar and Eucalyptus Veneers. Kastamonu Univ., Journal of Forestry Faculty, 13, 2, 175-181.
[14] Demirkir C., (2012). Using Possibilities of Pine Species in Turkey for Structural Plywood Manufacturing. PhD Thesis, Karadeniz Technical University Natural Sciences, Trabzon, Turkey.
[15] Bozkurt A.Y. and Erdin N., (1992). Wood Anatomy. İstanbul University Forestry Faculty Publisher, 415.
[16] Erdil Y. Z. Zhang J. and Eckelman C. A., (2002). Holding strength of screws in plywood and oriented strandboard, Forest Products Journal, 52, 6, 55–62.
[17] Wu Q., (1999). Screw-Holding Capacity of Two Furniture-Grade Plywoods, Composites and Manufactured Products. Forest Prod. J., 49, 4.
[18] Stieda C.K.A., (1990). The Lateral Resistance of Nailed Plywood to Wood Connections, Project No: 54-43D-216, Forestry Canada No: 26B.
[19] Winistorfer S.G. and Soltis L.A., (1994). Lateral and Withdrawal Strength of Nail Connections for Manufacturing Housing. J. Struct. Eng.-ASCE, 120, 12, 3577-3594.
[20] APA The Engineered Wood Association. (2007). The Engineered Wood Association. Voluntary Product Standard. PS 1-07 Structural Plywood with Typical APA Trademarks, Form No: H860, February.
[21] Bal, B. C., (2016). Some technological properties of laminated veneer lumber produced with fast-growing Poplar and Eucalyptus, Maderas. Ciencia y tecnología, 18, 3, 413-424.
[22] Hunt R.D. and Bryant A.H., (1984). Nailed Joints for timber Structures Proceeding of Pacific Timber Engineering Conference, Auckland, New Zealand, May. pp. 616-621.
[23] ISO 16670, (2003). Timber structures - Joints made with mechanical fasteners - Quasi-static reversed cyclic test method, Switzerland.
[24] Ekwueme C.G. and Hart G.C., (2000). Non-Linear Analysis of Light-Framed Wood Buildings. 12WCEE: 12th World Conference on Earthquake Engineering, p:1-8.[online]< http://www.iitk.ac.in/nicee/wcee/ article/2279.pdf.
[25] National Forest Products Association, (2012). National design specifications for wood construction, Washington, DC.
[26] APA The Engineered Wood Association. (2001). Diaphragm and Shearwalls, Form No. L350G/ Revised September 2001/0400.
[27] APA The Engineered Wood Association. (2007). Diaphragm and Shearwalls, Design /Construction Guide Form No. L350A. Revised October 2007.