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Determining the Shear Modulus of Sitka Spruce from Torsion Tests

Khokhar, Aamir; Zhang, Hexin; Ridley-Ellis, Daniel; Moore, John

Authors

John Moore



Abstract

This paper presents details of the experimental method, and preliminary results from, a series of torsion tests undertaken to evaluate the shear modulus of Sitka spruce (Picea sitchensis) timber. Direct torsion tests were used to determine the variation of shear modulus within and between pieces of timber with rectangular cross-sections and with lengths ranging from 1 m up to 3.6 m. Preliminary results obtained indicate that there was considerable variation in shear modulus between pieces of timber tested, but that there was no relationship with the modulus of elasticity in bending, or knot area. Approximately 33 percent of the variation in shear modulus was due to variation along the length of a piece of timber sample. More detailed investigation of the shear transfer mechanism within a timber beam is required, particularly to identify those physical and anatomical characteristics which influence the shear properties.

Citation

Khokhar, A., Zhang, H., Ridley-Ellis, D., & Moore, J. (2008). Determining the Shear Modulus of Sitka Spruce from Torsion Tests. In 10th World Conference on Timber Engineering 2008 (2137-2144)

Conference Name WCTE2008:10th World Conference on Timber Engineering
Start Date Jun 2, 2008
End Date Jun 5, 2008
Acceptance Date Feb 4, 2008
Online Publication Date Jun 2, 2008
Publication Date Jun 2, 2008
Deposit Date Apr 25, 2017
Publicly Available Date Apr 26, 2017
Publisher Engineered Wood Products Association
Pages 2137-2144
Book Title 10th World Conference on Timber Engineering 2008
Chapter Number 3
ISBN 9781615670888
Keywords Torsion, timber, Sitka spruce,
Public URL http://researchrepository.napier.ac.uk/Output/833209
Contract Date Apr 25, 2017

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