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

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

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.

• Language: English
• Keywords: mechanical model, mechano-sorption, multi-Fickian moisture transport model, rheology, tensile stress perpendicular to the grain, wood
• Work type: Scientific work
• Typology: 1.01 - Original Scientific Article
• Organization: FGG - Faculty of Civil and Geodetic Engineering
• Publication status: In print
• Publication version: Version of Record
• Publisher: De Gruyter
• Year: 2019
• Number of pages: Str. 1-13
• PID: 20.500.12556/RUL-114508
• UDC: 624.04
• ISSN on article: 0018-3830
• DOI: 10.1515/hf-2019-0025
• COBISS.SI-ID: 8965217
• Publication date in RUL: 03.03.2020

Record is a part of a journal

• Title: Holzforschung
• Shortened title: Holzforschung
• Publisher: Technischer Verlag Herbert Cram
• ISSN: 0018-3830
• COBISS.SI-ID: 9817605

Licences

• License: CC BY-NC-ND 4.0, Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
• Link: http://creativecommons.org/licenses/by-nc-nd/4.0/
• Description: The most restrictive Creative Commons license. This only allows people to download and share the work for no commercial gain and for no other purposes.
• Licensing start date: 03.03.2020

Secondary language

• Language: English
• Keywords: mehanski model, mehano-sorptivni učinek, multi-Fckian model prenosa vlage, reologija, natezne napetosti pravokotno na vlakna, les