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Impact of laminate directions on inplane shear stiffness of crosslaminated timber
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.ORCID iD: 0000-0002-0145-080X
Number of Authors: 2
2016 (English)In: Annual Meeting of the Northern European Network for Wood Science and Engineering WSE,: a key factor on the transition to Bioeconomy, 2016Conference paper, Abstract (Refereed)
Abstract [en]

Twenty-three finite element models of cross-laminated timber (CLT) with different laminate directions were studied. Simulations with quadratic orthotropic linear elastic finite elements were conducted. One goal was to compare in-plane shear stiffnesses for CLT blocks made up from Norway Spruce (Picea abies) boards. 3- and 5-layer CLT were studied with board sizes 25x150x1200 mm. Bloc sizes were 75x1200x1200 and 125x1200x1200 mm for 3-layer and 5-layer blocs, respectively. The first and last layers laminate directions were assumed to be in direction 0. The second and fourth layers laminate directions for 5-layer models were assumed equal and were 5, 10, 15, 30, 45, 60, 75 and 90. The middle layer was in direction 0 or 90. For 3-layer models the middle layers laminate directions were 5, 10, 15, 30, 45, 60, 75 and 90. No edge gluing was assumed and thus all side edges were allowed to separate or overlap. Glued contact surfaces were assumed to be perfectly glued with rigid glue. The results for 5-layer models showed that all models with angled second and fourth layers were stiffer than the models with 90 layers. Stiffnesses for models with angled second and fourth layers were higher when the middle layer laminate direction was 90 compared to 0. The stiffest 5-layer model was the one with laminate directions 0/45/90/45/0. This stiffness was 1.5 times the shear stiffness of a reference block with 1-layer and solid timber shear stiffness. The stiffest 3-layer model was the one with laminate directions 0/30/0. This stiffness was 0.99 times the shear stiffness of the reference bloc.

Place, publisher, year, edition, pages
2016.
Keyword [en]
Cross laminated timber, CLT, shear stiffness, finite element, FEM
National Category
Engineering and Technology Other Mechanical Engineering
Research subject
Wood Science and Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-45312OAI: oai:DiVA.org:ltu-45312DiVA: diva2:1019173
Conference
12th Annual Meeting of the Northern European Network for Wood Science and Engineering WSE, 12-13 September, 2016, Riga, Latvia
Available from: 2016-10-04 Created: 2016-10-04 Last updated: 2016-11-29Bibliographically approved

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Turesson, JonasEkevad, Mats
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