Numerical analysis of moisture induced strains and stresses in glued-laminated timber

Huč, Sabina (avtor), Svensson, Staffan (avtor), Hozjan, Tomaž (avtor)

Changes in relative humidity of the ambient air, RH (%), cause wetting and drying of wood material, which results in non-uniform moisture contents or moisture gradients, and consequently in moisture-induced stresses and strains in the glued-laminated timber (glulam) members. The aim of the present paper is to perform a hygro-mechanical analysis to predict the mechanical behavior of glulam specimens exposed to two RH regimes, causing wetting from 50% to 90% RH and drying from 90% to 50% RH, and compare the numerical to the experimental results. The aims are also to quantitatively analyze the influence of characteristic material parameters required in the multi-Fickian moisture transport model and the mechanical model on moisture-induced strains and stresses in glulam specimens and to determine the possibility of cracking of the material by analyzing the maximum tensile stresses perpendicular to the grain. Accurate numerical predictions of moisture contents and moisture-induced strains are obtained in the glulam specimens during wetting and drying as compared to the experimental results. The influence of a particular characteristic material parameter on moisture-induced strains and stresses is characterized as significant, but not crucial when a rough numerical estimation of the mechanical behavior of the glulam beam exposed to RH changes is required.

• Jezik: Angleški jezik
• Ključne besede: mechanical model, mechano-sorption, multi-Fickian moisture transport model, rheology, tensile stress perpendicular to the grain, wood
• Vrsta gradiva: Znanstveno delo
• Tipologija: 1.01 - Izvirni znanstveni članek
• Organizacija: FGG - Fakulteta za gradbeništvo in geodezijo
• Status publikacije: V tisku
• Različica publikacije: Objavljena publikacija
• Založnik: De Gruyter
• Leto izida: 2019
• Št. strani: Str. 1-13
• PID: 20.500.12556/RUL-114508
• UDK: 624.04
• ISSN pri članku: 0018-3830
• DOI: 10.1515/hf-2019-0025
• COBISS.SI-ID: 8965217
• Datum objave v RUL: 03.03.2020

Gradivo je del revije

• Naslov: Holzforschung
• Skrajšan naslov: Holzforschung
• Založnik: Technischer Verlag Herbert Cram
• ISSN: 0018-3830
• COBISS.SI-ID: 9817605

Licence

• Licenca: CC BY-NC-ND 4.0, Creative Commons Priznanje avtorstva-Nekomercialno-Brez predelav 4.0 Mednarodna
• Povezava: http://creativecommons.org/licenses/by-nc-nd/4.0/deed.sl
• Opis: Najbolj omejujoča licenca Creative Commons. Uporabniki lahko prenesejo in delijo delo v nekomercialne namene in ga ne smejo uporabiti za nobene druge namene.
• Začetek licenciranja: 03.03.2020

Sekundarni jezik

• Jezik: Angleški jezik
• Ključne besede: mehanski model, mehano-sorptivni učinek, multi-Fckian model prenosa vlage, reologija, natezne napetosti pravokotno na vlakna, les