Possibility to Use Short Sawn Timber in the Production of Glued Laminated Beams

Dziurka, Dorota; Kuliński, Marcin; Trociński, Adrian; Mirski, Radosław

doi:10.3390/ma15092992

Cited by 4 publications

(3 citation statements)

References 22 publications

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“…The timber pieces were obtained from logs originating from the Forest Division Olesno (50°52′30″ N 18°25′00″ E). Plywood 21 mm thick (Biaform S.A., Bialystok, Poland) was used in this study and its characteristics were given in an earlier publication [ 37 ]. In addition, previous work [ 18 , 38 , 39 ] suggests that it is more advantageous to sort lumber visually and determine its linear elastic modulus sonically or mechanically, and then form beams with the assumption that the closer to the center of the designed beam, the lower quality lumber can be used.…”

Section: Methodsmentioning

confidence: 99%

The Effect of Periodic Loading of Glued Laminated Beams on Their Static Bending Strength

et al. 2022

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Engineered wood products (EWP) such as glulam beams are gaining more and more popularity due to several advantages resulting from the wood itself, as well as the constant search for structural materials of natural origin. However, building materials face some requirements regarding their strength. Thus, the study aimed to assess the static bending strength of structural beams produced with the use of pine wood, after the periodic loading of approximately 80 kN for a year. The manufactured beams differed in the type of facing layers, i.e., pine timber with a high modulus of elasticity and plywood. The produced beams, regardless of their structure, are characterized by a similar static bending strength. Moreover, it has been shown that the loading of beams in the range of about 45% of their immediate capacity does not significantly affect their static bending strength and linear modulus of elasticity.

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Section: Methodsmentioning

confidence: 99%

The Effect of Periodic Loading of Glued Laminated Beams on Their Static Bending Strength

et al. 2022

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“…For example, most often, length limitation is one of the important challenges of reusing salvaged timber. Currently, the use of short timber elements in mass laminated timber is possible in general through finger jointing or other forms of end-to-end joining, e.g., [15,16]. These methods require processing the cross-section of the short timber elements and then gluing them together to create a longer board.…”

Section: Introductionmentioning

confidence: 99%

Bending Properties and Vibration Characteristics of Dowel-Laminated Timber Panels Made with Short Salvaged Timber Elements

2023

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Salvaged timber elements often have length limitations, and therefore, their reuse in structural products normally would require additional processing and end-to-end joining. This increases the costs of reusing such materials, which makes them even less attractive to the timber sector. In the presented research, a new approach is proposed for reusing short, salvaged timber elements combined with new (full-scale) timber boards to fabricate dowel-laminated timber (DLT) panels without significant processing or end-to-end joining or gluing. In this approach, salvaged timber elements are pressed in the system in such a way that they can contribute to the bending performance of the DLT panels by resisting compression stress. In order to evaluate the effectiveness, several small-scale and large-scale DLT panels were fabricated. Salvaged plywood tenons were used as connectors. The bending stiffness of the small-scale DLT panels and the first eigenfrequency, damping ratio, bending properties, and failure modes of the large-scale DLT panels were evaluated. The results exhibited that by using the proposed approach, the short, salvaged timber elements can contribute substantially to the bending stiffness of the DLT panels without requiring end-to-end joining or gluing. On average, about a 40% increase in the bending stiffness could be achieved by pressing in the salvaged timber elements, which results in relatively similar stiffness properties compared to conventional DLT panels. One further characteristic is that the failure of the panels, and therefore the panel’s strength, is mainly governed by the quality of the full-scale timber boards instead of the salvaged ones. This can be beneficial for practical use as the qualitative assessment of the strength properties of salvaged timber becomes less critical.

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“…The use of structural FJs is commonly governed by their performance finger length and joint profile directly influence performance [5,[10][11][12]. Non-structural joints, where strength is not the primary concern, generally use short finger lengths due to the aesthetic preference for the application [7,8,13]. A structural joint, with longer fingers, is used where the objective is to match (or come close to) the performance of the original board strength.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Performance and Bond Integrity of Finger Jointed High-Density Sub-Tropical Hardwoods for Residential Decking

Faircloth

Kumar

McGavin

et al. 2023

Forests

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Finger jointing has long been a method of extending the longitudinal span of short-length timber pieces through a tooth-like profile of a nominated length and bonded with adhesive. With the high-density hardwood resource in the sub-tropics, local industries have found it difficult to obtain adequate bond integrity for high moisture areas and outdoor applications, where a good bond is governed by the dry modulus of rupture (MOR) and the percentage of wood fibre present in the separated joint after exposure to water impregnation. This paper presents the finger joint performance in terms of MOR, stiffness (MOE), and wood fiber amount (WFA) under different variables, joint profile (10 and 20 mm long fingers) using two structurally rated adhesives (a single-component polyurethane (1C-PUR) and resorcinol formaldehyde (RF)) on spotted gum (Corymbia citriodora) and Darwin stringybark (Eucalyptus tetrodonta) jointed boards. Dry bending strength or MOR testing indicated the 20 mm joints with the PUR adhesive had the best performance across both tested species compared to the RF adhesive. The measured MOE of the joints showed the RF samples to have higher MOE (7% to 13%) than the PUR samples for both joint sizes and species. Testing of joint durability through water impregnation resulted in MOR and MOE values decreasing by up to 50% for the RF and PUR joints. Conversely, the performance of water-impregnated joints after being allowed to re-condition to a 12% equilibrium moisture content produced a regain of MOR for the PUR joints across both species of 30% to 40%. Furthermore, it was found that the WFA increased for the PUR samples between the water-impregnated samples and the re-conditioned samples.

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Possibility to Use Short Sawn Timber in the Production of Glued Laminated Beams

Cited by 4 publications

References 22 publications

The Effect of Periodic Loading of Glued Laminated Beams on Their Static Bending Strength

The Effect of Periodic Loading of Glued Laminated Beams on Their Static Bending Strength

Bending Properties and Vibration Characteristics of Dowel-Laminated Timber Panels Made with Short Salvaged Timber Elements

Mechanical Performance and Bond Integrity of Finger Jointed High-Density Sub-Tropical Hardwoods for Residential Decking

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