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.
Highlights
Because of changing resource conditions, plantation forests are expected to replace natural forests as the main source of timber in the near future
It is important to study the potential use for Japanese cedar plantation wood in future applications
The results show that and beams using exhibited approximately those using onlyshear screws exhibited some undulating andthe stepwise responses, that shearlinear force implying that force between the flanges web glue may cause implying buckling, as well as the behavior, whereas those using only screws exhibited some undulating and stepwise responses, between the flanges and the web may cause buckling, as well as the dislocation of the self-tapping dislocation of the self-tapping screws because of crushing failure of the wood body at the screw implying thatlocations
Summary
Because of changing resource conditions, plantation forests are expected to replace natural forests as the main source of timber in the near future. Japanese cedar (Cryptomeria japonica (L. f.) D. Don) is one of the main plantation species in Taiwan and Japan. Attributing to its fast-growing cycle and favorable processing properties, the processed Japanese cedar products are often used for structural and decorative applications. The plantation area of Japanese cedar in Taiwan is approximately 30,555 ha and the total stock volume is approximately 7.69 million m3 [1], which could be a great resource of domestic timber supply. It is important to study the potential use for Japanese cedar plantation wood in future applications
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