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Abstract
Glued laminated timber (GLT) is an engineered wood product widely used in structural applications. The mechanical properties of the GLT beams significantly depend on the mechanical properties of local weak sections such as knots and finger joints (FJs). Conventionally, the mechanical behavior of the local weak sections has been mainly investigated in the individual lamellae. In the present study, their mechanical behaviors within the GLT beams are investigated. 22 GLT beams with well-known beam setups in four-point bending tests were studied. Digital image correlation was used to measure displacements and strains in the region of the beams with the constant bending moment. This paper presents the strain distributions in the GLT beams and discusses the influence of the timber board arrangements and, accordingly, the knots and the FJs. As expected, the strain distributions of the GLT beams vary significantly. Depending on the arrangement of the knots, they can cause strain concentrations in the beams, which can be distributed to the adjacent lamellae. FJs do not cause significant strain concentrations; however, they can influence the strain distribution along the lamellae. Furthermore, a reduced stiffness of the FJs, compared to the connected timber boards, is identified.
Original language | English |
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Article number | 137095 |
Number of pages | 19 |
Journal | Construction and Building Materials |
Volume | 438 |
DOIs | |
Publication status | Published - 9 Aug 2024 |
MoE publication type | A1 Journal article-refereed |
Keywords
- Digital image correlation
- Finger joints
- GLT beams
- Stiffness
- Strain distributions
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Dive into the research topics of 'Experimental stiffness investigation of finger joints in glued laminated timber beams using digital image correlation'. Together they form a unique fingerprint.Projects
- 1 Finished
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Glued laminated timber/Fink: Glued laminated timber 2nd generation GLT 2.0
Fink, G. (Principal investigator), Azadi Kakavand, M. (Project Member), Vafadar Estiar, F. (Project Member), Collins, S. (Project Member), Derikvand, M. (Project Member), Jaaranen, J. (Project Member) & Ruan, G. (Project Member)
01/09/2020 → 31/08/2024
Project: Academy of Finland: Other research funding