| Journal: | Maderas : ciencia y tecnología |
| Database: | |
| System number: | 000534533 |
| ISSN: | 0718-221X |
| Authors: | O'Ceallaigh, Conan1 Sikora, Karol2 McPolin, Daniel3 Harte, Annette M.1 |
| Institutions: | 1National University of Ireland Galway College of Engineering & Informatics & Ryan Institute, Galway. Ireland 2University of Wollongong in Dubai Faculty of Engineering and Information Sciences, Dubai. UAE 3Queen’s University Belfast School of Planning Architecture and Civil Engineering, Belfast. UK |
| Year: | 2019 |
| Volumen: | 21 |
| Number: | 1 |
| Pages: | 45-64 |
| Country: | Chile |
| Language: | Inglés |
| English abstract | The use of fast-grown timber in the manufacture of engineered wood products is increasing; however, the fast growth rate results in a low-density timber that is susceptible to significant swelling and shrinkage deformations under changing moisture content. The current study focuses on the characterisation of the moisture diffusion and swelling/shrinkage of fast-grown Sitka spruce and the prediction of the moisture-induced strain development in Sitka spruce glulam beams under variable humidity cycles. Moisture content evolution and swelling/shrinkage coefficients were measured and the longitudinal swelling/shrinkage was found to be significantly greater than for slow-grown timber. Sitka spruce glued-laminated beams were subjected to controlled relative humidity cycling for 52 weeks and the moisture distribution and moisture-induced strains were measured continuously. Coupled moisture-displacement numerical models, incorporating the experimentally measured material parameters were developed. The effect of the glue-line was found to have an insignificant effect on moisture transport, however, the material orientation greatly influenced the predicted moisture-induced strain. Accurately mapping the material orientation produced significantly better predictions of the experimental results over the 52-week period. |
| Keyword: | Adsorption, Desorption, Finite element analysis, Glued laminated timber, Long-term moisture transport, Moisture diffusion. |
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