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Effect of lamellas annual-ring orientation on cracking of glulam beams investigated with computer tomography and image processing
RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Byggande och boende (TRb).ORCID iD: 0000-0002-0006-9425
Luleå University of Technology, Sweden.
Luleå University of Technology, Sweden.
2013 (English)In: Wood Material Science & Engineering, ISSN 1748-0272, E-ISSN 1748-0280, Vol. 8, no 3, p. 166-174Article in journal (Refereed) Published
Abstract [en]

Cracks in glulam beams can reduce their strength, depending on the crack's depth, length, and location and can also be a passage for the accumulation of water and dirt. To avoid cracks, the relationship between cracks (area of cracks, mm2) and annual-ring orientation in glulam beams of spruce (Picea abies), and pine (Pinus sylvestris) with different dimensions and surface treatments was investigated using RGB images of the surface and tomography images of the cross-sections. Image processing was used to measure characteristics visible in the photos such as crack area and lamella position in the beam. Combination of lamellas in lay up was measured from computer tomography images. Four types of combinations were defined; type 1 (pith side facing outward), types 2 and 3 (pith to the same side), and type 4 (pith sides meet pith side). It was found that the area close to the glue line in the lamellas in combination type 4 is the most subject to cracking, whereas combinations of type 1 show the highest resistance to cracking. This means that type 4 should not be used in glulam beams, because the lamellas shrink apart from each other causing stresses and resulting cracks.

Place, publisher, year, edition, pages
2013. Vol. 8, no 3, p. 166-174
Keywords [en]
cracks, CT scanning, glulam beam, image processing, lay ups
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-6463DOI: 10.1080/17480272.2013.789551Scopus ID: 2-s2.0-84883557766Local ID: 15252OAI: oai:DiVA.org:ri-6463DiVA, id: diva2:964301
Available from: 2016-09-08 Created: 2016-09-08 Last updated: 2023-05-23Bibliographically approved

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Sandberg, Karin

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