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Front. Built Environ. | doi: 10.3389/fbuil.2019.00058

Cross Laminated Timber (CLT) beams loaded in plane: testing stiffness and shear strength

  • 1University of Trento, Italy
  • 2Timbertech, Italy
  • 3Norwegian University of Life Sciences, Norway

Cross Laminated Timber (CLT) is a relatively new timber product used in constructions that gained lots of popularity over the last decade. The product itself is constituted by multiple glued layers of juxtaposed boards, usually arranged in an opposite direction between one layer and the adjacent ones. This particular structure brings several benefits, i.e. the possibility to use the same product both for walls and slabs, since it can bear in plane and out of plane loads. However, the mechanical behavior differs from usual timber products, and research is still ongoing to achieve common agreement on standard procedures for testing and theories for evaluating stresses for safety verifications. This paper proposes to investigate the behavior of CLT beams loaded in plane by testing several specimen with a four point bending test setup according to the EN 408 procedure \cite{EN408}. The main goal is to analyze the shear behavior of these beams hence the particular geometry is specifically chosen to obtain in plane shear failure. First the matter is analyzed by a literature review to study the existing theories for the calculation of in plan shear stresses in CLT elements. Then the experimental campaign is reported, the first part regarding elastic range test for Modulus of Elasticity measurement and the second main part regarding the failure tests to investigate shear behavior with regard to different mechanisms. Last conclusions are made and results are compared with other existing tests and proposed values in literature.

Keywords: CLT, Cross laminated timber, testing, shear, In plane, shear stress, Shear Strenght

Received: 03 Mar 2019; Accepted: 18 Apr 2019.

Edited by:

Dimitrios Kraniotis, OsloMet – Oslo Metropolitan University, Norway

Reviewed by:

George WARDEH, Université de Cergy-Pontoise, France
Ying H. Chui, University of Alberta, Canada  

Copyright: © 2019 Boggian, Andreolli and Tomasi. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

* Correspondence: Mr. Francesco Boggian, University of Trento, Trento, Italy, francesco.boggian@gmail.com