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Finite element modelling of moisture related and visco-elasticdeformations in inhomogeneous timber beams
Technical University of Denmark, Denmark. (Träbyggnadsteknik)ORCID iD: 0000-0001-5591-1045
Lund University.
2013 (English)In: Engineering structures, ISSN 0141-0296, E-ISSN 1873-7323, Vol. 49, p. 182-189Article in journal (Refereed) Published
Abstract [en]

Wood is a hygro-mechanical, non-isotropic and inhomogeneous material concerning both modulus ofelasticity (MOE) and shrinkage properties. In stress calculations associated with ordinary timber design,these matters are often not dealt with properly. The main reason for this is that stress distributions ininhomogeneous glued laminated members (glulam) and in composite beams exposed to combinedmechanical action and variable climate conditions are extremely difficult to predict by hand. Severalexperimental studies of Norway spruce have shown that the longitudinal modulus of elasticity and thelongitudinal shrinkage coefficient vary considerably from pith to bark. The question is how much thesevariations affect the stress distribution in wooden structures exposed to variable moisture climate. Thepaper presents a finite element implementation of a beam element with the aim of studying how woodencomposites behave during both mechanical and environmental load action. The beam element is exposedto both axial and lateral deformation. The material model employed concerns the elastic, shrinkage, mechano-sorption and visco-elastic behaviour of the wood material. It is used here to simulate the behaviourof several simply-supported and continuous composite beams subjected to both mechanical and environmentalloading to illustrate the advantages this can provide. The results indicate clearly both the inhomogeneityof the material and the variable moisture action occurring to have had a significant effecton the stress distribution within the cross-section of the products that were studied.

Place, publisher, year, edition, pages
Elsevier, 2013. Vol. 49, p. 182-189
Keywords [en]
Wood, Moisture induced stresses, Creep, FEM, Beam element
National Category
Wood Science
Research subject
Technology (byts ev till Engineering), Civil engineering
Identifiers
URN: urn:nbn:se:lnu:diva-40582DOI: 10.1016/j.engstruct.2012.10.019OAI: oai:DiVA.org:lnu-40582DiVA, id: diva2:793353
Available from: 2015-03-06 Created: 2015-03-04 Last updated: 2017-12-04Bibliographically approved

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Ormarsson, Sigurdur

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CiteExportLink to record
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  • apa
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Output format
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