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Strength grading of wet Norway spruce side boards by use of axial dynamic excitation
Linnaeus University, Faculty of Science and Engineering, School of Engineering. (Träbyggteknik)ORCID iD: 0000-0002-8513-0394
Linnaeus University, Faculty of Science and Engineering, School of Engineering. (Träbyggteknik)
Linnaeus University, Faculty of Science and Engineering, School of Engineering. (Träbyggteknik)ORCID iD: 0000-0001-5319-4855
Linnaeus University, Faculty of Science and Engineering, School of Engineering. (Träbyggteknik)
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2010 (English)In: Proceedings of the 2010 World Conference on Timber Engineering, Riva del Garda, Trento, Italy, June 20-24 / [ed] Ario Ceccotti, 2010Conference paper, Published paper (Refereed)
Abstract [en]

Strength grading of Norway spruce side boards in the wet state was investigated. For a batch of 58 boards, densities 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 measured and its relation to MOEdyn for both split and unsplit boards determined. A so called reversed lamination effect on the stiffness caused by the splitting of boards into two parts was also evaluated. 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 reversed lamination effect on the stiffness of split boards was found to be of lower order.

Place, publisher, year, edition, pages
2010.
Keyword [en]
strength grading, axial stiffness, side boards, wet state, green state
National Category
Building Technologies
Research subject
Technology (byts ev till Engineering), Civil engineering
Identifiers
URN: urn:nbn:se:lnu:diva-39808OAI: oai:DiVA.org:lnu-39808DiVA, id: diva2:787277
Conference
World Conference on Timber Engineering, Riva del Garda, Trento, Italy, June 20-24, 2010
Available from: 2015-02-09 Created: 2015-02-09 Last updated: 2016-12-15

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fulltext(326 kB)89 downloads
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