Evaluation of the mechanical properties of cross laminated timber with elementary beam theories

Published Date
30 September 2016, Vol.122:202–213, doi:10.1016/j.conbuildmat.2016.06.082

Author 

I.P. Christovasilis ^a,,

M. Brunetti ^b,

M. Follesa ^c,

M. Nocetti ^b,

D. Vassallo ^c,

aAether Engineering s.a.s., Via Quintino Sella 6/A, 50136 Florence, Italy

bCNR-IVALSA, Istituto per la Valorizzazione del Legno e delle Specie Arboree, via Madonna del Piano 10, I-50019 Sesto Fiorentino (FI), Italy

cdedaLEGNO, Via Masaccio 252, 50132 Florence, Italy

Received 26 January 2016. Revised 14 June 2016. Accepted 15 June 2016. Available online 23 June 2016. 

Highlights

• Presents well-established theories for identification of mechanical properties.
• •
  Covers identification procedures for loads perpendicular and parallel to plane.
• •
  Bending response is well represented in terms of elastic and strength properties.
• •
  Rolling shear strength demonstrates a significant variability.
• •
  Consistency identified for a combined shear failure criterion for loads in plane.
  
  
  Abstract
  
  
  This paper presents a study on the assessment of the mechanical properties of cross laminated timber (CLT) panels based on four-point bending tests. The most recent or well-established analytical theories have been implemented to estimate stiffness and strength properties under loads perpendicular or parallel to the principal plane of CLT panels from laboratory tests. The main objectives were to evaluate each proposed theory in predicting the associated deformation and failure mechanisms and to assess the reliability of the estimated properties with respect to the expected values and in terms of consistency among specimens with different layer configurations. The results indicate that the bending response is on average well represented in the implemented theories for the two cases of loading and in terms of both elastic and strength properties. For loads perpendicular to plane the characteristic rolling shear strength appears to have a significant variability among the different layups for all three applied methods, while for loads in plane the consideration of a combined rolling and torsional shear failure criterion provides more consistent results with respect to a less rigorous approach.
  
  
  Keywords
• 
  
Cross laminated timber
• Mechanical properties
• Bending test
• Parameter identification
• Rolling shear

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  Corresponding author.

For further details log on website :
http://www.sciencedirect.com/science/article/pii/S0950061816313514