Nail-holding Capacity of Guiding Bore Hole Diameter in P. massoniana and C. lanceolata Dimension Lumber

Abstract

The nail-holding performance of two major commercial wood species in southern China, P. massoniana (Masson pine) and C. lanceolata (Chinese fir), were investigated in this paper. Nail-holding strength tests on the two kinds of wood were conducted using self-tapping screws and round steel nails, respectively, with the focus on analyzing the impact law of guiding bore diameter on nail-holding performance. Without the guiding hole, the nail-holding force of both kinds of nails was poor. When the guiding hole diameter increased moderately, the nail-holding force showed an upward trend. Nevertheless, if the guiding hole diameter was too large, the nail-holding force would drop sharply. The nail-holding force of self-tapping screws peaked when the guiding hole diameter was 2.0 mm, and that of round steel nails reached the maximum when the guiding hole diameter was 2.5 mm. In addition, there were remarkable differences in the nail-holding force performance of P. massoniana and C. lanceolata wood under different guiding hole diameters, and their load-displacement curve characteristics also varied. Reasonable design of the diameter of the guiding hole can significantly enhance the nail-holding performance of wood, ensuring the stability and reliability of wood structure connections.