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Equivalent stiffness of timber used in CLT: closed-form estimates and numerical validation

Authors
  • Perret, Olivier1
  • Lebée, Arthur1
  • Douthe, Cyril1
  • Sab, Karam1
  • 1 École des Ponts ParisTech, IFSTTAR, CNRS, Université Paris-Est, Laboratoire Navier UMR 8205, 6-8 Avenue Blaise Pascal, Cité Descartes, Champs-sur-Marne, Marne-la-Vallée, 77455, France , Marne-la-Vallée (France)
Type
Published Article
Journal
European Journal of Wood and Wood Products
Publisher
Springer Berlin Heidelberg
Publication Date
Mar 01, 2019
Volume
77
Issue
3
Pages
367–379
Identifiers
DOI: 10.1007/s00107-019-01395-x
Source
Springer Nature
License
Yellow

Abstract

In this paper, a closed-form approach is presented to estimate rapidly the equivalent stiffness of boards used in cross laminated timber (CLT) panels from local orthotropic behavior at ring scale for varying sawing patterns. It is first assumed that narrow edges are glued. In this case, closed-form Reuss and Voigt bounds are derived for the equivalent layer behavior of CLT. An application to Norway spruce boards is presented and reveals that the cross-layer (rolling) shear behavior lies between 100 and 150 MPa with a careful selection of the board sawing pattern. Then, using finite element method, upper bounds for the cross-layer shear stiffness modulus of boards with and without glued edges are calculated and theoretical predictions are compared with recommendations and experimental data from the literature. Finally, it appears that these bounds remain relevant for CLT layer with unglued narrow edges for common aspect ratios.

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