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Strength grading of wet Norway spruce side boards for use as laminations in wet-glued laminated beams
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: 0000-0002-6410-1017
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)
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2010 (English)In: Proceedings of the final conference of COST action E53, 4-7 May 2010, Edinburgh, Scotland, 2010., 2010Conference paper, Published paper (Other academic)
Abstract [en]

Strength grading of Norway spruce side boards in the wet state was investigated. For a sample of 58 boards of dimensions 25×120×3000 mm3, density and dynamic modulus of elasticity in the axial direction, MOEdyn, were determined in the wet state. The boards were then split into two parts and the procedure of determining MOEdyn was repeated both before and after the boards were dried to a target moisture content of 12 %. Tensile strength of the split boards was finally measured and its relation to MOEdyn for both split and unsplit boards determined. The investigation also included an evaluation of a so called reversed lamination effect on the stiffness caused by the splitting of boards into two parts. The results show that strength grading of split boards in the wet state could give just as good results as grading performed after drying. The coefficient of determination between MOEdyn in wet and dried states was as high as R2=0.92, and the relation between MOEdyn in the wet state and tensile strength in the dried state, σt, was of the same order (R2=0.55) as the relation between MOEdyn in the dried state and σt (R2=0.52). Regarding the reversed lamination effect on the stiffness of split boards, it was found to be of low order.

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-6978OAI: oai:DiVA.org:lnu-6978DiVA, id: diva2:332345
Conference
The final conference of COST action E53, 4-7 May 2010, Edinburgh, Scotland, 2010.
Available from: 2010-08-05 Created: 2010-08-04 Last updated: 2019-10-17Bibliographically approved

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Oscarsson, JanOlsson, AndersJohansson, MarieEnquist, BertilSerrano, Erik
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