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Strength Properties of CLT Composed of Sugi Laminations : (6) Compression Parallel to the Grain and Compression Perpendicular to the Grain

https://research.thinkwood.com/en/permalink/catalogue986
Year of Publication
2013
Topic
Mechanical Properties
Material
CLT (Cross-Laminated Timber)
Author
Ido, Hirofumi
Sugimoto, Kenichi
Nagao, Hirobumi
Miyattaki, Atsushi
Watanabe, Hiroshi
Organization
Architectural Institute of Japan
Year of Publication
2013
Country of Publication
Japan
Format
Journal Article
Material
CLT (Cross-Laminated Timber)
Topic
Mechanical Properties
Keywords
Sugi
Compression
Language
Japanese
Research Status
Complete
Summary
As timber tends to be weak against the load perpendicular to grains, it can be important to study the consequences of applying loads perpendicular to larch cross-laminated (CLT) composed of multiple larch laminae. Compressions tests were conducted perpendicular to the in-plane and out-of-plane grains of Japanese larch CLT. Out-of-pane average compressive strenth, average yield strength, and average compressive stiffness perpendicular to the grain of the larch CLT were 11.94 N.mm2, 7.30 N/mm2, and 7.30 N/mm2, respectively, whereas the in-plane average compressive strength, average yield strength, and average compressive stiffness perpendicular to the grain of the CLT larch were 21.48 N/mm2, 21.18 N/mm2, and 18.72 N/mm2, respectively. The in-plane compressive strength and yield strength showed a statistically significant relationship with the density fo the CLT, the modulus of elasticity measured by longitudinal vibration (MOElv), and the average MOElv of the laminae constructing the cross-laminated timber. The in-plane yield strength was affected by the MOWlv of the outer laminae and the average MOElv of the larch cross-laminated timber. The compressive strength properties were most affected by the loading surface of the CLT. The variation between the moisture content and compressive strength properties of the CLT, however, was not statistically significant.
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Strength Properties of CLT Composed of Sugi Laminations: (5) In-Plane Bending Strength

https://research.thinkwood.com/en/permalink/catalogue987
Year of Publication
2013
Topic
Mechanical Properties
Material
CLT (Cross-Laminated Timber)
Author
Hiramatsu, Yasushi
Miyattaki, Atsushi
Shinto, Kenta
Watanabe, Hiroshi
Organization
Architectural Institute of Japan
Year of Publication
2013
Country of Publication
Japan
Format
Journal Article
Material
CLT (Cross-Laminated Timber)
Topic
Mechanical Properties
Keywords
Bending Strength
Sugi
Language
Japanese
Research Status
Complete
Summary
Cross-laminated timber (CLT) has recently emerged as a new wood product that utilizes a large quantity of domestic lumber. This study aims to analyze the effects of width and lay-ups on the tensile strength of CLT. To this end, the elastic modulus of sugi CLT with different lay-ups was measured by dynamic and static methods. Moreover, tensile tests were conducted for different widths and lay-ups of CLT. Results indicate that the apparent bending Young’s modulus, as calculated using the dynamic method, is directly proportional to the measured Young’s modulus in static method for each lay-up. Furthermore, there was no significant effect of width on the tensile strength in the range of 150, 300, and 600 mm. However, the variations in lay-ups affected the tensile strength as follows: CLT with larger ratio of the major strength direction lamina along the cross-section and with higher grade of lamina in the major strength direction showed higher tensile strength. The estimated tensile strength of CLT, as calculated using the Young’s modulus of the lamina of each layer, and the tensile strength of lamina as simple substance was found to be in good agreement with the measured tensile strength of CLT.
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Compressive Strength Properties Perpendicular to the Grain of Larch Cross-laminated Timber

https://research.thinkwood.com/en/permalink/catalogue2410
Year of Publication
2019
Topic
Mechanical Properties
Material
CLT (Cross-Laminated Timber)
Application
Wood Building Systems

Strength Properties of CLT Composed of Sugi Laminations : (9) Small Scale CLT Shear Wall

https://research.thinkwood.com/en/permalink/catalogue984
Year of Publication
2013
Topic
Mechanical Properties
Material
CLT (Cross-Laminated Timber)
Application
Shear Walls
Author
Watanabe, Hiroshi
Araki, Yasuhiro
Nakajima, Shiro
Miyattaki, Atsushi
Yasumura, Motoi
Ando, Naoto
Kaiko, Naoto
Organization
Architectural Institute of Japan
Year of Publication
2013
Country of Publication
Japan
Format
Journal Article
Material
CLT (Cross-Laminated Timber)
Application
Shear Walls
Topic
Mechanical Properties
Keywords
In-Plane Shear Force
Strength Properties
Sugi
Language
Japanese
Research Status
Complete
Summary
An investigation was carried out on CLT panels made from Sitka spruce in order to establish the effect of the thickness of CLT panels on the bending stiffness and strength and the rolling shear. Bending and shear tests on 3-layer and 5-layer panels were performed with loading in the out-of-plane and in-plane directions. ‘Global’ stiffness measurements were found to correlate well with theoretical values. Based on the results, there was a general tendency that both the bending strength and rolling shear decreased with panel thickness. Mean values for rolling shear ranged from 1.0 N/mm2 to 2.0 N/mm2.
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Mechanical Properties of Cross-laminated Timber (CLT) Panels Composed of Treated Dimensional Lumber

https://research.thinkwood.com/en/permalink/catalogue2423
Year of Publication
2019
Topic
Mechanical Properties
Material
CLT (Cross-Laminated Timber)
Application
Wood Building Systems
Walls
Floors
Author
Tripathi, Sachin
Publisher
Mississippi State University
Year of Publication
2019
Country of Publication
United States
Format
Thesis
Material
CLT (Cross-Laminated Timber)
Application
Wood Building Systems
Walls
Floors
Topic
Mechanical Properties
Keywords
Panels
Rolling Shear
Preservative
Adhesives
Southern Yellow Pine
Out-of-Plane Load
Language
English
Research Status
Complete
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Compressive Strength of Cross-Laminated Timber Panel

https://research.thinkwood.com/en/permalink/catalogue280
Year of Publication
2014
Topic
Mechanical Properties
Material
CLT (Cross-Laminated Timber)
Application
Walls
Author
Oh, Jung-Kwon
Hong, Jung-Pyo
Lee, Junjae
Year of Publication
2014
Country of Publication
Slovakia
Format
Conference Paper
Material
CLT (Cross-Laminated Timber)
Application
Walls
Topic
Mechanical Properties
Keywords
Compression Strength
Mid-Rise
Vertical Bearing Load
Monte Carlo
Language
English
Conference
International Convention of Society of Wood Science and Technology
Research Status
Complete
Notes
June 23-27, 2014, Zvolen, Slovakia, p.761-768
Summary
The mission of the Hardwood Scanning Center at Purdue University is to increase the global competitiveness of the United States hardwood industry and to conserve the hardwood resource by development of manufacturing technologies which will enable hardwood industry to “see inside a tree” and use this information to make better processing decisions. The Hardwood Scanning Center partnered with Microtek, GmbH of Italy in the development of an industrial grade log CT scanner. World’s first three industrial CT log scanners have been installed in last 12 months in mills around the world and we will briefly discuss their application. The Hardwood Scanning Center also developed visualization and optimization software for the hardwood veneer and sawmill operations. This presentation will provide an overview of state-of-the-art in CT scanning of logs.
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Prediction of Compressive Strength of Cross-Laminated Timber Panel

https://research.thinkwood.com/en/permalink/catalogue517
Year of Publication
2015
Topic
Mechanical Properties
Material
CLT (Cross-Laminated Timber)
Application
Walls
Author
Oh, Jung-Kwon
Lee, Jun-Jae
Hong, Jung-Pyo
Publisher
Springer Japan
Year of Publication
2015
Country of Publication
Japan
Format
Journal Article
Material
CLT (Cross-Laminated Timber)
Application
Walls
Topic
Mechanical Properties
Keywords
Lamina
Monte Carlo
Compressive Strength
Language
English
Research Status
Complete
Series
Journal of Wood Science
ISSN
1611-4663
Summary
Compressive strength of cross-laminated timber (CLT) is one of the important mechanical properties which should be considered especially in design of mid-rise CLT building because it works to resist a vertical bearing load from the upper storeys. The CLT panel can be manufactured in various combinations of the grade and dimension of lamina. This leads to the fact that an experimental approach to evaluate the strength of CLT would be expensive and time-demanding. In this paper, lamina property-based models for predicting the compressive strength of CLT panel was studied. A Monte Carlo simulation was applied for the model prediction. A set of experimental compression tests on CLT panel (short column) was conducted to validate the model and it shows good results. Using this model, the influence of the lamina’s width on the CLT compressive strength was investigated. It reveals that the CLT compressive strength increases with the increase in the number of lamina. It was thought that repetitive member effect (or dispersion effect) is applicable for the CLT panel, which was explained by the decrease of the variation in strength. This dependency of the number of lamina needs further study in development of reference design values, CLT wall design and CLT manufacturing.
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Bending, Shear, and Compressive Properties of Three- and Five-Layer Cross-Laminated Timber Fabricated with Black Spruce

https://research.thinkwood.com/en/permalink/catalogue2589
Year of Publication
2020
Topic
Design and Systems
Mechanical Properties
Material
CLT (Cross-Laminated Timber)
Author
He, Minjuan
Sun, Xiaofeng
Li, Zheng
Feng, Wei
Publisher
SpringerOpen
Year of Publication
2020
Format
Journal Article
Material
CLT (Cross-Laminated Timber)
Topic
Design and Systems
Mechanical Properties
Keywords
Black Spruce
Panels
Bending
Thickness
Language
English
Research Status
Complete
Series
Journal of Wood Science
Summary
Cross-laminated timber (CLT) is an innovative engineering wood product made by gluing layers of solid-sawn lumber at perpendicular angles. The commonly used wood species for CLT manufacturing include spruce-pine-fir (SPF), douglas fir-larch, and southern pine lumber. With the hope of broadening the wood species for CLT manufacturing, the purposes of this study include evaluating the mechanical properties of black spruce CLT and analyzing the influence of CLT thickness on its bending or shear properties. In this paper, bending, shear, and compressive tests were conducted respectively on 3-layer CLT panels with a thickness of 105 mm and on 5-layer CLT panels with a thickness of 155 mm, both of which were fabricated with No. 2-grade Canadian black spruce. Their bending or shear resisting properties as well as the failure modes were analyzed. Furthermore, comparison of mechanical properties was conducted between the black spruce CLT panels and the CLT panels fabricated with some other common wood species. Finally, for both the CLT bending panels and the CLT shear panels, their numerical models were developed and calibrated with the experimental results. For the CLT bending panels, results show that increasing the CLT thickness whilst maintaining identical span-to-thickness ratios can even slightly reduce the characteristic bending strength of the black spruce CLT. For the CLT shear panels, results show that increasing the CLT thickness whilst maintaining identical span-to-thickness ratios has little enhancement on their characteristic shear strength. For the CLT bending panels, their effective bending stiffness based on the Shear Analogy theory can be used as a more accurate prediction on their experiment-based global bending stiffness. The model of the CLT bending specimens is capable of predicting their bending properties; whereas, the model of the CLT shear specimens would underestimate their ultimate shear resisting capacity due to the absence of the rolling shear mechanism in the model, although the elastic stiffness can be predicted accurately. Overall, it is attested that the black spruce CLT can provide ideal bending or shear properties, which can be comparable to those of the CLT fabricated with other commonly used wood species. Besides, further efforts should focus on developing a numerical model that can consider the influence of the rolling shear mechanism.
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Study the Influence of Perpendicular to Grain Compression and Creep in 4 to 8 Storey Lightweight Timber Framed Buildings

https://research.thinkwood.com/en/permalink/catalogue1925
Year of Publication
2018
Topic
Mechanical Properties
Material
CLT (Cross-Laminated Timber)
Application
Wood Building Systems
Walls

10 records – page 1 of 1.