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11 records – page 1 of 2.

Bending Properties of Innovative Multi-Layer Composite Laminated Panels

https://research.thinkwood.com/en/permalink/catalogue1985
Year of Publication
2018
Topic
Mechanical Properties
Material
LSL (Laminated Strand Lumber)
OSL (Oriented Strand Lumber)
Application
Beams

Effect of Growth Ring Orientation on the Rolling Shear Properties of Wooden Cross Layer Under Two-Plate Shear Test

https://research.thinkwood.com/en/permalink/catalogue635
Year of Publication
2014
Topic
Mechanical Properties
Material
CLT (Cross-Laminated Timber)
Author
Zhou, Qinyi
Gong, Meng
Chui, Ying Hei
Mohammad, Mohammad
Year of Publication
2014
Country of Publication
Canada
Format
Conference Paper
Material
CLT (Cross-Laminated Timber)
Topic
Mechanical Properties
Keywords
Growth Ring Orientation
Rolling Shear Modulus
Rolling Shear Strength
Spruce
Two-plate shear test
Language
English
Conference
World Conference on Timber Engineering
Research Status
Complete
Notes
August 10-14, 2014, Quebec City, Canada
Summary
The design and application of cross laminated timber (CLT) is s trongly influenced by rolling shear properties of cross layers. Hence, predicting the mechanical behaviour of CLT requires accurate information about its rolling shear properties. In this study, black spruce wood laminates with three different growth ring orientations (flat sawn, in-between, quarter sawn) were edge glued to produce wooden cross layer (WCL). Two-plate shear tests were carried out on WCL to investigate the influence of growth ring orientation on the rolling shear properties. The experimental results showed that the growth ring orientation had a significant effect on rolling shear modulus of WCL, however, almost no effect on the rolling shear strength. The WCL of in-between end grain had the maximum rolling shear modulus of 89MPa and rolling sh ear strength of 2.13 MPa.
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Embedment Strength of Cross-Laminated Timber for Smooth Dowel-type Fasteners

https://research.thinkwood.com/en/permalink/catalogue2118
Year of Publication
2019
Topic
Connections
Design and Systems
Material
CLT (Cross-Laminated Timber)
Application
Wood Building Systems
Author
Dong, Weiqun
Li, Qiao
Zhang, Hao
Wang, Zhiqiang
Zhou, Jianhui
Gong, Meng
Year of Publication
2019
Country of Publication
France
Format
Conference Paper
Material
CLT (Cross-Laminated Timber)
Application
Wood Building Systems
Topic
Connections
Design and Systems
Keywords
Fasteners
Embedment Strength
Failure Modes
Embedment Tests
Dowel-Type Connections
Language
English
Conference
International Conference on Advances in Civil Engineering and Materials
Research Status
Complete
Series
MATEC Web of Conferences
Online Access
Free
Resource Link
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Evaluation of Adhesive Bond Strength of Two-Layer Asymmetric Cross-Laminated LSL Specimens

https://research.thinkwood.com/en/permalink/catalogue1548
Year of Publication
2016
Topic
Connections
Mechanical Properties
Material
CLT (Cross-Laminated Timber)
LSL (Laminated Strand Lumber)
Author
Gong, Meng
Chui, Ying Hei
Li, Ling
Year of Publication
2016
Country of Publication
Austria
Format
Conference Paper
Material
CLT (Cross-Laminated Timber)
LSL (Laminated Strand Lumber)
Topic
Connections
Mechanical Properties
Keywords
Adhesives
Bond Strength
Short Span
Bending Tests
Two-Component Polyurethane
Polyvinyl Acetate
Language
English
Conference
World Conference on Timber Engineering
Research Status
Complete
Notes
August 22-25, 2016, Vienna, Austria p. 1185-1190
Summary
Massive timber panels (MTPs) has shown a great potential in construction of tall buildings. Evaluation of the face-bond strength of MTPs is of an interest to use of this kind of products. This study was aimed at developing an appropriate test procedure for evaluating the adhesive bond strength of cross-laminated laminated strand lumber (LSL). Short span bending tests were conducted on two-layer asymmetric cross-laminated LSL specimens, which were adhesively bonded using two-component polyurethane (PUR) and polyvinyl acetate (PVAc). For comparison, block shear specimens were tested as well. It was found that the 2-layer asymmetric cross-laminated specimen assembly under the short span bending could be used to differentiate between good and poor bond quality.
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Feasibility of Using Poplar as Cross Layer to Fabricated Cross-Laminated Timber

https://research.thinkwood.com/en/permalink/catalogue620
Year of Publication
2014
Topic
Mechanical Properties
Material
CLT (Cross-Laminated Timber)
Author
Wang, Zhiqiang
Fu, Hongmei
Chui, Ying-hei
Gong, Meng
Year of Publication
2014
Country of Publication
Canada
Format
Conference Paper
Material
CLT (Cross-Laminated Timber)
Topic
Mechanical Properties
Keywords
Bonding Strength
Shear Strength
Modulus of Elasticity
Failure Modes
Poplar
Douglas-Fir
Pine
Language
English
Conference
World Conference on Timber Engineering
Research Status
Complete
Notes
August 10-14, 2014, Quebec City, Canada
Summary
Use of poplar (Populus euramericana cv. I-214) as cross layer to manufacture cross-laminated timber (CLT) was examined in this study. For comparison purpose, Douglas fir (Pseudotsuga menziesii) and Monterey pine (Pinus radiata D.Don) were used as well to produce five layups of CLT panels. The mechanical properties tested in this study included the bending strength in the major direction, modulus of elasticity in the major direction, shear strength parallel to the major direction and shear strength perpendicular to the major direction. It was found that the mechanical properties of CLT panels containing poplar were similar to those made of non-poplar wood. The major failure modes found were joint failure, shear failure and delamination. It could be feasible to use poplar as a cross layer to fabricate CLT without decreasing its strength properties.
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Influence of Layer and Laminate Characteristics on Shear Properties of Cross Laminated Timber and Hybrids

https://research.thinkwood.com/en/permalink/catalogue1543
Year of Publication
2016
Topic
Mechanical Properties
Material
CLT (Cross-Laminated Timber)
LSL (Laminated Strand Lumber)
OSL (Oriented Strand Lumber)
Application
Floors
Author
Niederwestberg, Jan
Chui, Ying Hei
Gong, Meng
Year of Publication
2016
Country of Publication
Austria
Format
Conference Paper
Material
CLT (Cross-Laminated Timber)
LSL (Laminated Strand Lumber)
OSL (Oriented Strand Lumber)
Application
Floors
Topic
Mechanical Properties
Keywords
Shear Tests
Aspect Ratio
Growth Ring Orientation
Edge-Gluing
Static Test
Modal Test
Language
English
Conference
World Conference on Timber Engineering
Research Status
Complete
Notes
August 22-25, 2016, Vienna, Austria p. 1113-1122
Summary
In-plane shear and planar shear due to out-of-plane bending are important properties for the design of CLT-type floor systems. Properties of CLT-type panels are influenced by the orientation of the layer’s major stiffness directions and the properties of their layers. The layers are influenced by their characteristics, laminate aspect ratio, growth ring orientation and edge-gluing. In order to utilize the mechanical potential of CLT-type panels, it is necessary to understand the effects of layer and laminate properties on CLT performance. CLT and CLT-hybrid panels were tested in planar and in-plane shear tests. The shear properties were evaluated using static and modal test procedures, the accuracy of non-destructive test methods was evaluated. Relationships between specimen properties and the characteristics of laminates and layers, such as aspect ratio, growth ring orientation and edge-gluing, were established.
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Lumber-Based Mass Timber Products in Construction

https://research.thinkwood.com/en/permalink/catalogue2163
Year of Publication
2019
Topic
General Information
Material
Glulam (Glue-Laminated Timber)
NLT (Nail-Laminated Timber)
DLT (Dowel Laminated Timber)
CLT (Cross-Laminated Timber)

Measurement of Rolling Shear Modulus of Cross Laminated Timber: Exploratory Study Using Downscaled Specimens Under Variable Span Bending Tests

https://research.thinkwood.com/en/permalink/catalogue605
Year of Publication
2012
Topic
Mechanical Properties
Material
CLT (Cross-Laminated Timber)
Author
Zhou, Qinyi
Gong, Meng
Chui, Ying Hei
Mohammand, Mohammand
Publisher
IEEE
Year of Publication
2012
Country of Publication
China
Format
Conference Paper
Material
CLT (Cross-Laminated Timber)
Topic
Mechanical Properties
Keywords
Rolling Shear Modulus
Three Point Bending Test
Steel
Span-to-Depth Ratio
Growth Ring Orientation
Language
English
Conference
International Conference on Biobase Material Science and Engineering
Research Status
Complete
Notes
October 21-23, 2012, Changsha, China
Summary
The purpose of this study was to measure the rolling shear modulus of Cross Laminated Timber (CLT), which was achieved by conducting 3-point bending tests with variable span using downscaled sandwich specimens. Two types of sandwich specimens were employed: steel-wood-steel (SWS) and wood-wood-wood (WWW). Experimental results from SWS specimens were verified with those predicted from WWW ones through the shear analogy method. Effects of span-to-depth ratio (l/h) and growth ring orientation on rolling shear modulus (G RT ) were also examined. It was found that the average deflection of WWW specimens tested at l/h of 6.5 could be well predicted using the shear analogy method based on true elasticity of modulus (E m ) and G RT of the cross layer measured using SWS specimens under variable span tests. The results also showed that the cross layer of `in-between' growth ring orientation could gain the higher rolling shear modulus than that of flat sawn or quarter sawn one.
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Mechanical Performances of Hybrid Cross Laminated Timber Fabricated with Lumber and LVL

https://research.thinkwood.com/en/permalink/catalogue1570
Year of Publication
2016
Topic
Mechanical Properties
Material
CLT (Cross-Laminated Timber)
LVL (Laminated Veneer Lumber)
Author
Fu, Hongmei
Wang, Zhiqiang
Chen, Yinhui
Gong, Meng
Lu, Xiaoning
Chui, Ying Hei
Year of Publication
2016
Country of Publication
Austria
Format
Conference Paper
Material
CLT (Cross-Laminated Timber)
LVL (Laminated Veneer Lumber)
Topic
Mechanical Properties
Keywords
Hybrid Structures
Failure Modes
Language
English
Conference
World Conference on Timber Engineering
Research Status
Complete
Notes
August 22-25, 2016, Vienna, Austria p. 1692-1697
Summary
Hybrid cross laminated timber (HCLT) was fabricated using lumber (Spruce-pine-fir,SPF) and laminated veneer lumber (LVL), the bending and shear performances of which were evaluated. Three types of CLT panels, one generic CLT (used as control) and two types HCLT, were fabricated. The failure modes of CLT and HCLT were visually examined and recorded. The mechanical properties measured included the bending properties (in the major direction) and shear properties (in both major and minor directions). It was found that the planar shear failure of cross layer was the key and primary failure mode of CLT and HCLT under bending. Lumber and LVL had different direction of crack propagation in planar shear, and LVL had lower planar shear properties than SPF lumber. The weak zones in the radial-tangential (RT) section of wood including earlywood/laterwood boundary and wood ray were easy to occur shear failure. The HCLT having LVL as the outer layer had the highest bending and shear strengths. The modulus of elasticity (MOE) of the HCLT having LVL as the outer layer and lumber as the cross layer was 17.6% higher than that of generic CLT. However, the HCLT having lumber as the outer layer and LVL as the cross layer had the lowest mechanical properties.
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Mechanical Properties of Laminated Strand Lumber and Hybrid Cross-Laminated Timber

https://research.thinkwood.com/en/permalink/catalogue419
Year of Publication
2015
Topic
Mechanical Properties
Material
CLT (Cross-Laminated Timber)
LSL (Laminated Strand Lumber)
Author
Wang, Zhiqiang
Gong, Meng
Chui, Ying Hei
Publisher
ScienceDirect
Year of Publication
2015
Country of Publication
Netherlands
Format
Journal Article
Material
CLT (Cross-Laminated Timber)
LSL (Laminated Strand Lumber)
Topic
Mechanical Properties
Keywords
Bending Properties
Failure Modes
Planar Shear Properties
Language
English
Research Status
Complete
Series
Construction and Building Materials
Summary
Hybrid cross laminated timber (HCLT) was fabricated using lumber and/or laminated strand lumber (LSL), the mechanical performances of which were evaluated. To reach this goal, the mechanical properties of LSL and the bending properties of CLT and HCLT were measured in this study. The properties of LSL measured included the tension strength (only in the major direction), shear strength, shear modulus, and modulus of elasticity (MOE) and modulus of rupture (MOR). The failure mode of each kind of specimens was visually examined and recorded. Four types of CLT panels, one generic CLT (used as control) and three types HCLT were fabricated. The properties measured included the bending properties (in the major direction) and planar shear properties (in both major and minor directions). It was found that the HCLT had better bending and planar shear properties than that of generic CLT. The MOE and MOR of HCLT having LSL as the outer layers were 19% and 36% higher than those of generic one, respectively. The MOE and MOR of HCLT having LSL as core layer (replacing the cross lumber layer) were 13% and 24% higher than that of generic CLT, respectively. The failure modes of four types of CLT observed included the planar shear failure of cross lumber layer, tension failure of bottom LSL, and tension failure of bottom lumber, especially tension failure of lumber originated at a knot(s).
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11 records – page 1 of 2.