Shear Properties of Symmetric Angle-Ply Cross-Laminated Timber Panels

Bahmanzad, A.; Clouston, Peggi L.; Arwade, Sanjay R.; Schreyer, Alexander C.

doi:10.1061/(asce)mt.1943-5533.0003348

Cited by 3 publications

(3 citation statements)

References 10 publications

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“…Other researchers have shown interest in studying both the shear and bending performance of DCLT panels with different angle-ply orientations. Bahmanzad et al [6] performed research on three-ply DCLT panels fabricated from eastern hemlock. The inner layer had grain orientations of 30 • , 45 • , 60 • , and CLT (90 • ) relative to the main load-bearing direction.…”

Section: Introductionmentioning

confidence: 99%

Investigating the Out-of-Plane Bending Stiffness Properties in Hybrid Species Diagonal-Cross-Laminated Timber Panels

Kurzinski,

Crovella

2024

Applied Sciences

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Since the introduction of Cross-laminated Timber (CLT) in Austria in the early 1990s, the adoption of this 90°-crosswise-laminated product has seen exponential growth worldwide. Compared to traditional laminated timber products (e.g., glulam), CLT provides improved dimensional stability but with reduced out-of-plane bending stiffness. To improve the bending stiffness, while maintaining relative dimensional stability, a modified orientation of the inner layers in a diagonal direction can be used. This novel product is Diagonal-Cross-laminated Timber (DCLT), a composite timber product, consisting of inner layers which are rotated at different angle-ply orientations between 0 and 90 degrees to the outer layers. To properly model the out-of-plane bending behavior of the DCLT, analytical models and finite element analysis (FEA) were used, and the results were validated by four-point bending tests performed on DCLT panels with angle-ply orientations of 10°, 20°, 40°, 70°, and a conventional CLT 90° panel. The results indicate that DCLT panels with angle-ply cross layers have a structural advantage in out-of-plane bending over traditional CLT (90°) panels. The apparent bending stiffness from DCLT 90° to DCLT ± 10° has an increase of 33%, 24%, and 35%, respectively, regarding the assessed methods of experimental, theoretical, and FEM modeling. Using these panels would allow for increased spans or load-carrying capacity for a given panel span-to-depth ratio. The development of DCLT and its introduction to the industry not only could enable the use of lower-quality timber that would not otherwise satisfy structural requirements for CLT but also could help reduce the fabrication cost of CLT due to utilizing lower amounts of fiber.

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Section: Introductionmentioning

confidence: 99%

Investigating the Out-of-Plane Bending Stiffness Properties in Hybrid Species Diagonal-Cross-Laminated Timber Panels

Kurzinski,

Crovella

2024

Applied Sciences

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“…The implementation is, however, limited to symmetric cross-ply laminates. As the use of CLT is still growing, ideally a more general model that is easily implemented and also accounts for the behaviour of angle-ply and asymmetric laminates would help with further development of CLT and the potential next generation of laminated timber elements [20]. The question of accurately capturing the thickness resonances that are found to cut-on at higher frequencies also needs to be addressed.…”

Section: Introductionmentioning

confidence: 99%

“…The toolkit could also potentially open up the ability to utilise the anisotropic nature and laminate construction of CLT to alter the dynamic properties for improved sound radiation and/or vibration comfort qualities, or in general, the control of mechanical wave propagation with applications towards energy harvesting. Such insights could help further the development of CLT and beyond to the potential next generation of laminated timber elements such as angle-ply constructions, elements reinforced with fibre-reinforced polymers, and functionally graded elements [20,22].…”

Section: Introductionmentioning

confidence: 99%

An efficient analytical method to obtain the homogenised frequency-independent elastic material properties of cross-laminated timber elements

Vallely

Schoenwald²

2023

Journal of Sound and Vibration

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Research Trends in Hybrid Cross-Laminated Timber (CLT) to Enhance the Rolling Shear Strength of CLT

Yang¹,

LEE²,

강석구³

2021

Journal of the Korean Wood Science and Technology

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In this study, hybrid CLT research and development trends were analyzed to improve the low rolling shear strength of CLT, a large wooden panel used in high-rise wooden buildings. Through this, basic data that can be used in research and development directions for localization of CLT were prepared. As a way to improve the low rolling shear strength, the use of hardwood lamina, the change of the lamina arrangement angle, and the use of structural composite materials are mainly used. Rolling shear strength and shear modulus of hardwood lamina are more than twice as high as softwood lamina. It confirmed that hardwoods can be used and unused species can be used. Rolling shear strength 1.5 times, shear modulus 8.3 times, bending stiffness 4.1 times improved according to the change of the layer arrangement angle, and the CLT strength was confirmed by reducing the layer arrangement angle. Structural wood-based materials have been improved by up to 1.35 times MOR, 1.5 times MOE, and 1.59 times rolling shear strength when used as laminas. Block shear strength between the layer materials was also secured by 7.0 N/mm 2 ,which is the standard for block shear strength. Through the results of previous studies, it was confirmed that the strength performance was improved when a structural wood based materials having a flexural performance of MOE 7.0 GPa and MOR 40.0 MPa or more was used. This was determined based on the strength of layered materials in structural wood-based materials.The optimal method for improving rolling shear strength is judged to be the most advantageous application of structural wood based materials with strength values according to existing specifications. However, additional research is needed on the orientation of CLT lamina arrangement according to the fiber arrangement of structural wood-based materials, and the block shear strength between lamina materials.

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Shear Properties of Symmetric Angle-Ply Cross-Laminated Timber Panels

Cited by 3 publications

References 10 publications

Investigating the Out-of-Plane Bending Stiffness Properties in Hybrid Species Diagonal-Cross-Laminated Timber Panels

Investigating the Out-of-Plane Bending Stiffness Properties in Hybrid Species Diagonal-Cross-Laminated Timber Panels

An efficient analytical method to obtain the homogenised frequency-independent elastic material properties of cross-laminated timber elements

Research Trends in Hybrid Cross-Laminated Timber (CLT) to Enhance the Rolling Shear Strength of CLT

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