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Flexural Performance of Built-Up Beams Made with Plantation Wood

1
School of Forestry and Resource Conservation, National Taiwan University, #1, Sec. 4, Roosevelt Rd., Taipei 10617, Taiwan
2
Department of Forestry, National Chung Hsing University, 145 Xingda Rd., South Dist., Taichung City 402, Taiwan
*
Authors to whom correspondence should be addressed.
Forests 2019, 10(8), 647; https://doi.org/10.3390/f10080647
Received: 30 May 2019 / Revised: 22 July 2019 / Accepted: 25 July 2019 / Published: 1 August 2019
(This article belongs to the Special Issue Wood Productions and Renewable Materials)
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Abstract

In this study, Japanese cedar (Cryptomeria japonica (L. f.) D. Don) harvested from a plantation in Taiwan was used to develop built-up beams using self-tapping screws as metal connectors and resorcinol formaldehyde resin as glue to assemble components based on various assembly configurations. Results showed that adding glue provided flexural rigidity, whereas assembly using self-tapping screws resulted in built-up beams with high ductility but relatively low flexural bearing capacity. Beams used glue exhibited approximately linear behavior, whereas those using only screws exhibited some undulating and stepwise responses, implying that shear force between the flanges and the web may cause buckling as well as the dislocation of the self-tapping screws. When using components of similar grades, adding another web can improve the performance. Furthermore, the grades of flanges can strongly influence the flexural load-bearing capacity. In addition, a smaller spacing between the screws can improve the flexural load-bearing performance, but also cause wooden components to crack. Typical bending failure modes were observed in the developed built-up beams, indicating tension failure of the bottom flange as well as slippage between flanges and the web due to horizontal shear, which also caused buckling deformations in the screws. View Full-Text
Keywords: built-up beams; Japanese cedar; Cryptomeria japonica; self-tapping screws; plantation wood; resorcinol formaldehyde resin built-up beams; Japanese cedar; Cryptomeria japonica; self-tapping screws; plantation wood; resorcinol formaldehyde resin
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Chien, T.-P.; Yang, T.-H.; Chang, F.-C. Flexural Performance of Built-Up Beams Made with Plantation Wood. Forests 2019, 10, 647.

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