Open Access

ARTICLE

Nail Holding Performance of Self-Tapping Screws on Masson Pine and Chinese Fir Dimension Lumbers

by De Li^1,#, Bengang Zhang^1,#, Yuan Tu¹, Guoming Xiao¹, Meifen Tian², Xiaoxue Xu¹, Xiao Zhong¹, Qiaoyan Zhang³, Zhigang Wu^1,*, Jiankun Liang^4,*

1 College of Forestry, Guizhou University, Guiyang, 550025, China
2 Forestry Science and Technology Promotion Station, Xifeng County Bureau of Natural Resources, Guiyang, 551100, China
3 Forest Park Management Section, Zhazuo State-Owned Forest Farm, Guiyang, 550299, China
4 College of Civil Engineering, Kaili University, Qiandongnan, 556011, China

* Corresponding Authors: Zhigang Wu. Email: ; Jiankun Liang. Email:
# De Li and Bengang Zhang have contributed equally to this work

Journal of Renewable Materials 2023, 11(10), 3725-3738. https://doi.org/10.32604/jrm.2023.027895

Received 20 November 2022; Accepted 04 January 2023; Issue published 10 August 2023

Abstract

Screw connection is a type most commonly applied to timber structures. As important commercial tree species in China, Masson pine and Chinese fir have the potential to prepare wood structures. In this study, the effects of the diameter of the self-tapping screw and the guiding bores on the nail holding performance on different sections of Masson pine and Chinese fir dimension lumbers were mainly explored. The results showed that: (1) The nail holding strength of the tangential section was the maximum, followed by that of the radial section, and that of the cross section was the minimum. (2) The nail holding strength of Masson pine was higher than that of Chinese fir. (3) The nail holding strength grew with the increase in the diameter of self-tapping screws, but a large diameter would lead to plastic cracking of the timber, thus further affecting the nail holding strength. Masson pine and Chinese fir reached the maximum nail holding strength when the diameter of self-tapping screws was 3.5 mm. (4) Under a large diameter of screws, prefabricated guiding bores could mitigate timber cracking and improve its nail holding strength. (5) Prefabricated guiding bores were more necessary for the screw connection of Masson pine. The results obtained could provide a scientific basis for the screw connection design of Masson pine and Chinese fir timber structures.

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Keywords

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