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Dynamic excitation and higher bending modes for prediction oftimber bending strength
Linnaeus University, Faculty of Science and Engineering, School of Engineering. (Träbyggnadsteknik)ORCID iD: 0000-0002-6410-1017
Linnaeus University, Faculty of Science and Engineering, School of Engineering. (Träbyggnadsteknik)ORCID iD: 0000-0002-8513-0394
Linnaeus University, Faculty of Science and Engineering, School of Engineering. (Träbyggnadsteknik)ORCID iD: 0000-0001-5319-4855
Linnaeus University, Faculty of Science and Engineering, School of Engineering. (Träbyggnadsteknik)
2010 (English)In: Proceedings of the final conference of COST action E53, 2010Conference paper, Published paper (Other academic)
Abstract [en]

The potential of utilizing eigenfrequencies corresponding to edgewise bending modes for predicting the bending strength of timber is investigated. The research includes measurements of axial and transversal resonance frequencies, laboratory assessment of density, static bending stiffness and bending strength of 105 boards of Norway spruce of dimensions 45×145×3600 mm. It is shown that Eb,1, (MOE based on the eigenfrequency of the first bending mode) gives a higher coefficient of determination to the bending strength than what Ea,1 (MOE based on the first axial eigenfrequency) does. It is also shown that eigenfrequencies corresponding to higher bending modes can be used in the definition of a new prediction variable, the modulus of inhomogeneity (MOI). This is a scalar value representing the lack of fit between the true, measured eigenfrequencies and the expected (assuming homogeneity) eigenfrequencies of a board. The results show that using the MOI as a third prediction variable, in addition to Eb,1 and density, increases the coefficient of determination with respect to bending strength from R2 = 0.69 to R2 = 0.75.

Place, publisher, year, edition, pages
2010.
National Category
Building Technologies
Research subject
Technology (byts ev till Engineering), Civil engineering
Identifiers
URN: urn:nbn:se:lnu:diva-6975OAI: oai:DiVA.org:lnu-6975DiVA, id: diva2:332340
Conference
The final conference of COST action E53
Available from: 2010-08-05 Created: 2010-08-04 Last updated: 2019-10-17Bibliographically approved

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fulltext(572 kB)160 downloads
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Olsson, AndersOscarsson, JanJohansson, MarieKällsner, Bo
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CiteExportLink to record
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