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GL Beams Reinforced with Plywood in the Outer Layer

https://research.thinkwood.com/en/permalink/catalogue3101
Year of Publication
2022
Topic
Mechanical Properties
Material
Glulam (Glue-Laminated Timber)
Application
Beams
Author
Dziurka, Dorota
Derkowski, Adam
Wieruszewski, Marek
Kulinski, Marcin
Mirski, Radoslaw
Organization
Poznan University of Life Sciences
Editor
Sadowski, Tomasz
Publisher
MDPI
Year of Publication
2022
Format
Journal Article
Material
Glulam (Glue-Laminated Timber)
Application
Beams
Topic
Mechanical Properties
Keywords
Glued Elements
Solid Wood
Plywood
Research Status
Complete
Series
Materials
Summary
Glulam beams are increasingly used in the construction industry because of their high strength and the possibility of using round timber with smaller cross-sections. The load-bearing capacity of beams is strongly related to the quality of the outer layers and, in the case of wood, especially the tension zones. For these reasons, this study decided to replace the outer lamella with tensile plywood. The produced beams were subjected to static bending strength and modulus of elasticity evaluation. It was shown that the best static bending strength values were obtained for beams containing plywood in the tension layer. However, the change in structure in the tension zone of beams made of glued laminated timber results not only in an increase in the load capacity of elements produced in this way but also in a decrease in the range/range of the obtained results of bending strength. This way of modifying the construction of glued laminated beams allows a more rational use of available pine timber.
Online Access
Free
Resource Link
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Possibility to Use Short Sawn Timber in the Production of Glued Laminated Beams

https://research.thinkwood.com/en/permalink/catalogue3021
Year of Publication
2022
Topic
Mechanical Properties
Market and Adoption
Material
Glulam (Glue-Laminated Timber)
Author
Dziurka, Dorota
Kulinski, Marcin
Trocinski, Adrian
Mirski, Radoslaw
Organization
Poznan University of Life Sciences
Editor
Corradi, Marco
Publisher
MDPI
Year of Publication
2022
Format
Journal Article
Material
Glulam (Glue-Laminated Timber)
Topic
Mechanical Properties
Market and Adoption
Keywords
Structural Glulam Elements
Structural Beams
Strength Properties
Research Status
Complete
Series
Materials
Summary
Numerous studies have shown that the geometry of micro-joints significantly affects the strength of the so joined timber element. The bending strength increases by creating a larger bonding area by increasing the length of the wedge joint. Although this type of joint has been successfully used for many years, it can still be troublesome to make. For these reasons, the present study investigated an easy-to-fabricate wedge joint, which we folded during the beams’ formation and glued with the same adhesive as the individual lamellas. Although the research has not fully answered all the questions relevant to both scientific and technological curiosity, it indicates the great potential of this solution. Following the principle adopted in the ongoing wood optimisation work, we concluded that the beams of the target cross-section should be produced, and it should only be possible to cut them to a certain length. In this approach, we only removed defects at critical points for the beam structure and, in this way, up to 30% of the timber processed could be saved or better utilised.
Online Access
Free
Resource Link
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