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Experimental Study on Glued Laminated Timber Beams with Well-Known Knot Morphology

https://research.thinkwood.com/en/permalink/catalogue1373
Year of Publication
2018
Topic
Mechanical Properties
Material
Glulam (Glue-Laminated Timber)
Application
Beams
Author
Kandler, Georg
Lukacevic, Markus
Füssl, Josef
Publisher
Springer Berlin Heidelberg
Year of Publication
2018
Country of Publication
Germany
Format
Journal Article
Material
Glulam (Glue-Laminated Timber)
Application
Beams
Topic
Mechanical Properties
Keywords
Four Point Bending Test
Cracks
Knots
Language
English
Research Status
Complete
Series
European Journal of Wood and Wood Products
ISSN
1436-736X
Summary
Nowadays, the impact of knots on the failure behaviour of glued laminated timber (GLT) beams is considered by subjecting the single lamellas to a strength grading process, where, i.a., tracheid effect-based laser scanning is used to obtain information about knot properties. This approach single-handedly defines the beam’s final strength properties according to current standards. At the same time, advanced production processes of such beams would allow an easy tracking of a scanned board’s location, but, at this point, previously obtained detailed information is already disregarded. Therefore, the scanning data is used to virtually reconstruct knot geometries and group them into sections within GLT beams. For this study, a sample of 50 GLT beams of five different configuration types was produced and tested under static four-point-bending until failure. As for each assembled lamella the orientation and position within the corresponding GLT beam is known, several parameters derived from the reconstructed knots can be correlated to effective GLT properties. Furthermore, the crack patterns of the tested beams are manually recorded and used to obtain measures of cracks. A detailed analysis of the generated data and their statistical evaluation show that, in the future, dedicated mechanical models for such timber elements must be developed to realistically predict their strength properties. A potential approach, using fluctuating section-wise effective material properties, is proposed.
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Free
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From the Knot Morphology of Individual Timber Boards to the Mechanical Properties of Glued Laminated Timber

https://research.thinkwood.com/en/permalink/catalogue1610
Year of Publication
2016
Topic
Mechanical Properties
Material
Glulam (Glue-Laminated Timber)
Author
Kandler, Georg
Lukacevic, Markus
Füssl, Josef
Year of Publication
2016
Country of Publication
Austria
Format
Conference Paper
Material
Glulam (Glue-Laminated Timber)
Topic
Mechanical Properties
Keywords
Knots
Simulation
Language
English
Conference
World Conference on Timber Engineering
Research Status
Complete
Notes
August 22-25, 2016, Vienna, Austria p. 2195-2204
Summary
Knots and the resulting fibre deviations around them have significant impact on the mechanical properties of timber boards. Subsequently, the effective mechanical properties of timber products, such as glued laminated timber (GLT), are strongly influenced by those timber board properties. This motivated the development of an algorithm for reconstructing the knot morphology within individual timber boards, which is presented and discussed in this work. Furthermore, the link to the effective mechanical behaviour of GLT by using stochastic simulation techniques is explored, allowing the estimation of effective mechanical properties of GLT based on the morphology of individual timber boards.
Online Access
Free
Resource Link
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