Self-Tapping Screws without Pre-Drilling for Brazilian Reflorestation Species

Abstract:

Wood is a renewable source of structural material with high relative strength/weight, low energy production, which kidnaps and stores carbon in its production. The large use of wood is due to its special qualities as raw material for other products manufactured in residential construction or major works such as bridges, has been widely used in roofing for industrial and commercial buildings. Commercially there are limitations on the length of the wood, resulting from the extraction of tree trunks, thus requiring the adoption of binding elements is the use of self-tapping screws efforts required by side and which can be axial, shear, tensile or compression. Whereas in Brazil does not yet exist and the promising future of the product, this research aims to study the behavior of self-tapping screws together with Brazilian reforestation species of Pinus oocarpa and Lyptus (softwood and hardwood). Rothoblaas self-tapping screws had a good penetration in both woods without requiring pre-drilling, the species of Lyptus wood showed the highest values of strength and the inclination of the screws, at 45 degrees showed the best results on either species of wood.

• Periodical: Advanced Materials Research (Volumes 1025-1026)
• Pages: 345-348
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1025-1026.345
• Online since: September 2014
• Authors: Carlito Calil Neto*, André Luis Christoforo, Marília da Silva Bertolini, Francisco Antonio Rocco Lahr, Carlito Calil Junior
• Keywords: Pre-Drilling, Screw, Self-Tapping, Structural Analyses

References

[1] A.L. Christoforo, K.A. Blecha, A.L.C. Carvalho, L.F.S. Resende and F.A.L. Rocco: J. Civil. Eng. Res. Vol. 3 (2013), p.98.

[2] A.L. Christoforo, F.H. Icimoto, C.V. Fernandes, J. Fiorelli, J. Negrao and F.A.L. Rocco: Int. J. Mater. Eng. Vol. 3, No. 4 (2013), p.87.

[3] A.L. Christoforo, G.A. Romanholo, T.H. Panzera, P.H. Borges and F.A. Rocco: Eng. Agr. Jaboticabal. Vol. 31, No. 5 (2011), p.998.

[4] Correia, R. Ricardo and A.A. Dias: Ligações de peças de madeira com parafusos auto- atarraxantes. In: Brazilian Meeting on Wood and Wooden Structures (in Portuguese), 8. (VIII EBRAMEM), Uberlandia, MG (2002).

DOI: 10.11606/d.18.2016.tde-05042016-162903

[5] Brazilian Association of Technical Standards (ABNT) NBR 7190: Projects Timber Structures (in Portuguese). Rio de Janeiro (1997).

[6] BS EN 26891: 1991. Timber structures: Joints made with mechanical fasteners. General principles for the determination of strength and deformation characteristics, British-Adopted European Standard, Madri, p.8 (1991).

DOI: 10.3403/00248652u

[7] BS EN 28970: 1991. Timber structures: Testing of joints made with mechanical fasteners. Requirements for wood density, British-Adopted European Standard, Madrid, p.6 (1991).

DOI: 10.3403/00248640u

[8] American Society of Testing and Materials (ASTM) D1761: Standard Test Methods for Mechanical Fasteners in Wood, West Conshohocken. p.11 (2010).

[9] ISO 261: General purpose metric screw threads - General Plan (1998).

DOI: 10.3403/01677361u

[10] ISO 262: General purpose metric screw threads -Selected sizes for screws, bolts and nuts (1998).

DOI: 10.3403/01677373

[11] NCh 1198: Wood-wood constructions em - calculator, National Institute of Standardization (in Portuguese) – INN – Chile, p.101 (2006).