iForest - Biogeosciences and Forestry


Shear modulus of old timber

Alberto Cavalli   , Daniele Cibecchini, Giacomo Goli, Marco Togni

iForest - Biogeosciences and Forestry, Volume 10, Issue 2, Pages 446-450 (2017)
doi: https://doi.org/10.3832/ifor1787-009
Published: Mar 24, 2017 - Copyright © 2017 SISEF

Research Articles

Interest in both the time effect on the timber mechanical properties and the reuse of old solid timbers has prompted many research works since the 1970s, mainly focusing on evaluating bending strength (MOR) and stiffness (MOE). However, only few studies have investigated the effect of aging on shear modulus (G). In this work, transverse vibration test is used to calculate G and MOE of over 80 old timber beams. The MOE/G ratio and the relationship between G and different timber features are investigated. The main outcome of the research confirms that the MOE/G ratio is around 20, close to the value reported in literature for new solid timber. No relationship exists between G and MOE (r2=0.07) or between G and other timber features. When density and knots are used as predictors in a multiple regression model, the G prediction improves (r2=0.22). This work confirms that G is not affected by the age of timber.


Flexural Vibration, Old Timber, Historical Timber Buildings, Reclaimed Timber

Authors’ address

Alberto Cavalli
Daniele Cibecchini
Giacomo Goli
Marco Togni
GESAAF - Department of Agricultural, Food and Forestry Systems - Section Forestry, Environment, Wood, Landscape, University of Florence, v. San Bonaventura 13, I-50145 Florence (Italy)

Corresponding author

Alberto Cavalli


Cavalli A, Cibecchini D, Goli G, Togni M (2017). Shear modulus of old timber. iForest 10: 446-450. - doi: 10.3832/ifor1787-009

Academic Editor

Andrea Cutini

Paper history

Received: Jul 31, 2015
Accepted: Nov 12, 2016

First online: Mar 24, 2017
Publication Date: Apr 30, 2017
Publication Time: 4.40 months

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