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36 records – page 1 of 4.

Analysis of Mechanical Properties of Cross-Laminated Timber (CLT) with Plywood using Korean Larch

https://research.thinkwood.com/en/permalink/catalogue1806
Year of Publication
2018
Topic
Mechanical Properties
Material
CLT (Cross-Laminated Timber)
Author
Choi, Chul
Kojima, Erina
Kim, Kyung-Jung
Yamasaki, Mariko
Sasaki, Yasutoshi
Kang, Seog-Goo
Publisher
North Carolina State University
Year of Publication
2018
Format
Journal Article
Material
CLT (Cross-Laminated Timber)
Topic
Mechanical Properties
Keywords
Korean Larch
Bending Strength
Hybrid Wooden-Core Laminated Timber (HWLT)
Lamina
Compression
Tensile Strength
Korea
In-Plate Shear Failure
Research Status
Complete
Series
BioResources
Summary
The bending strength of hybrid wooden-core laminated timber (HWLT), a composite material made from existing cross-laminated timber (CLT) and plywood, was analyzed. Using plywood makes it possible to decrease the bending strength of the starting material. Korea Larch (Larix kaempferi Carr.) was used as plywood because of its popularity in Korea. To analyze HWLT’s bending properties, each component (lamina, plywood) was tested for bending, compression, and tensile strengths. The results showed that the HWLT’s bending strength depended on the plywood’s number of plies. With an increased number of plies, plywood’s bending strength decreased, and also HWLT’s bending strength decreased. Most of the failure showed in-plate shear failure of plywood. This result meant that use of reinforced plywood made it possible to increase HWLT’s bending strength for structural material.
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Assessment of Bending Properties of Sawn and Glulam Blackwood in Portugal

https://research.thinkwood.com/en/permalink/catalogue2463
Year of Publication
2020
Topic
Mechanical Properties
Material
Glulam (Glue-Laminated Timber)

Basalt Fibre Reinforcement of Bent Heterogeneous Glued Laminated Beams

https://research.thinkwood.com/en/permalink/catalogue2988
Year of Publication
2021
Topic
Mechanical Properties
Material
Glulam (Glue-Laminated Timber)
Application
Beams
Author
Wdowiak-Postulak, Agnieszka
Organization
Kielce University of Technology
Publisher
MDPI
Year of Publication
2021
Format
Journal Article
Material
Glulam (Glue-Laminated Timber)
Application
Beams
Topic
Mechanical Properties
Keywords
Timber Quality Classes
Basalt Fibre Reinforcement
Bending Strength
Theoretical Analysis
Numerical Analysis
Research Status
Complete
Series
Materials
Summary
The purpose of this paper is to demonstrate the properties of glued laminated beams made in diverse configurations of timber quality classes, reinforced using a new technique that is cheaper and easy to apply. The aim of the experimental investigations was to enhance reinforcement effectiveness and rigidity of glued laminated beams. The tests consisted of four-point bending of large-scale specimens reinforced with basalt fibres (BFRP). The tests were meant to obtain images of failure, the load–displacement relation and load carrying capacity of basalt fibres depending on the reinforcement ratio. The tests, which concerned low and average quality timber beams, were conducted in a few stages. The aim of the study was to popularize and increase the use of low-quality timber harvested from reafforested areas for structural applications. In the study, theoretical and numerical analysis was carried out for reinforced and unreinforced elements in various configurations of wood quality classes. The aim was to compare the results with the findings of experimental tests. Based on the tests, it was found that the load carrying capacity of beams reinforced with basalt fibre was higher by, respectively, 13% and 20% than that of reference beams, while their rigidity improved by, respectively, 9.99% and 17.13%. The experimental tests confirmed that basalt fibres are an effective structural reinforcement of structural timber with reduced mechanical properties.
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Bending Strength of Cross Laminated Timber Beams Loaded In Plane

https://research.thinkwood.com/en/permalink/catalogue28
Year of Publication
2014
Topic
Mechanical Properties
Material
CLT (Cross-Laminated Timber)
Application
Beams
Author
Blaß, Hans Joachim
Flaig, Marcus
Year of Publication
2014
Format
Conference Paper
Material
CLT (Cross-Laminated Timber)
Application
Beams
Topic
Mechanical Properties
Keywords
Bending Strength
Monte Carlo Model
Conference
World Conference on Timber Engineering
Research Status
Complete
Notes
August 10-14, 2014, Quebec City, Canada
Summary
A computer aided numerical model for the simulation of the in-plane bending strength of CLT beams is presented. The model uses the Monte-Carlo-Method to generate mechanical characteristics of board lamellae and is suitable for the investigation of statistical effects such as homogenisation and size effects. Six different types of CLT beams, varying in size and in layup, were tested to validate the model and except for beams with only one lamella in direction of the beam height good agreement was found between the experimental results and the model’s simulations.
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Bending Tests on Glued Laminated Timber Beams with Well-Known Material Properties

https://research.thinkwood.com/en/permalink/catalogue186
Year of Publication
2013
Topic
Mechanical Properties
Material
Glulam (Glue-Laminated Timber)
Application
Beams
Author
Fink, Gerhard
Kohler, Jochen
Frangi, Andrea
Organization
ETH Zurich
Year of Publication
2013
Format
Report
Material
Glulam (Glue-Laminated Timber)
Application
Beams
Topic
Mechanical Properties
Keywords
Bending Strength
Failure
Load Bearing Capacity
Four Point Bending Test
Density
Model
Bending Stiffness
Research Status
Complete
Summary
At the Institute of Structural Engineering at the ETH Zurich numerous of investigations are conducted to analyse the load bearing capacity of glued laminated timber beams. The investigations are part of the research project ’Influence of varying material properties on the load bearing capacity of glued laminated timber (glulam)’. The investigations are taking place on 24 glulam beams with well-known material properties. The glulam beams are fabricated out of 400 timber boards. From those boards the material properties are investigated non-destructively within a former research project. During the glulam fabrication it is particularly focused to keep the information of the timber boards; i.e. after the glulam fabrication the position of each particular timber board within the glulam beam and thus the position of each particular knot is still known. The glulam beams are investigated during a 4-point bending test. On the glulam members the load bearing capacity, the bending stiffness and the density is measured. Furthermore local strains within the glulam beams are investigated using an optical coordinate-measurement device. Following the test the failure is investigated in detail. Hereby the type of failure (knot cluster, finger joint, clear wood) and the amount of failure (number of damaged lamellas) is documented. Afterwards the failed glulam beams are loaded again to analyse the remaining bending strength and the corresponding remaining bending stiffness. The major aim of the experimental analysis is the investigation of the load bearing capacity of glulam beams with well-known local material properties. The gained results can be used for an investigation of the influence of local weak zones, such as knot clusters or finger joints, on the load bearing capacity of glulam. In addition a data basis is produced to develop a new model (or to evaluate existing models) for the estimation of the load bearing capacity of glulam.
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Butt-Joint Bonding of Timber as a Key Technology for Point-Supported, Biaxial Load Bearing Flat Slabs Made of Cross-Laminated Timber

https://research.thinkwood.com/en/permalink/catalogue2466
Year of Publication
2019
Topic
Mechanical Properties
Connections
Material
CLT (Cross-Laminated Timber)
Author
Zöllig, Stefan
Muster, Marcel
Themessl, Adam
Publisher
IOP Publishing Ltd
Year of Publication
2019
Format
Journal Article
Material
CLT (Cross-Laminated Timber)
Topic
Mechanical Properties
Connections
Keywords
Butt-Joint
Bending Strength
Shear Resistance
Research Status
Complete
Series
IOP Conference Series: Earth and Environmental Science
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Free
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Capacity and Reliability of LVL Beams Manufactured from Juvenile Hardwood Plantation Logs

https://research.thinkwood.com/en/permalink/catalogue2023
Year of Publication
2018
Topic
Mechanical Properties
Material
LVL (Laminated Veneer Lumber)
Application
Beams
Author
Gilbert, Benoit
Bailleres, Henri
Zhang, Hao
McGavin, Robert
Organization
Griffith University
The University of Sydney
Year of Publication
2018
Format
Conference Paper
Material
LVL (Laminated Veneer Lumber)
Application
Beams
Topic
Mechanical Properties
Keywords
Plantation
Hardwood
Bending Strength
Numerical Models
Capacity
Juvenile Wood
Conference
World Conference on Timber Engineering
Research Status
Complete
Summary
This paper summarises parts of the research outcomes of a university-government collaborative project aiming at determining the capacity and reliability of veneer-based structural products manufactured from early to midrotation (juvenile) hardwood plantations logs. Two species planted for solid timber end-products (Eucalyptus cloeziana and Corymbia citriodora) and one species traditionally grown for pulpwood (Eucalyptus globulus) were studied for the manufacture of the new products. Focus of this paper is on LVL beams. To cost-effectively determine the nominal design bending strengths of the new beams, a numerical model was developed. The model was found to accurately predict the strength of LVL beams with an average predicted to experimental ratio of 1.00 with a low coefficient of variation of 0.10. Using an established probabilistic database of the material properties of the veneered resources as model input, Monte-Carlo simulations were then performed. The design strength of the new LVL beams was established and found to be comparable to, and in some cases up to 2.5 times higher than, the ones of commercially available softwood products. Recommendations are also made in the paper on the appropriate capacity factors to be used for various service categories of structures. The proposed capacity factors were found to be 5% to 12% lower than the ones currently used in Australia for beams manufactured from mature softwood logs
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Characterization and Structural Performance in Bending of CLT Panels Made from Small-Diameter Logs of Loblolly/Slash Pine

https://research.thinkwood.com/en/permalink/catalogue2214
Year of Publication
2018
Topic
Design and Systems
Mechanical Properties
Material
CLT (Cross-Laminated Timber)

Cross Laminated Timber – Properties and Use for Building Purposes: A Review from the Experience of Swiss Researchers

https://research.thinkwood.com/en/permalink/catalogue23
Year of Publication
2013
Topic
Mechanical Properties
General Information
Material
CLT (Cross-Laminated Timber)
Author
Niemz, Peter
Sonderegger, Walter
Publisher
Transilvania University Press Brasov
Year of Publication
2013
Format
Journal Article
Material
CLT (Cross-Laminated Timber)
Topic
Mechanical Properties
General Information
Keywords
Physical Properties
MOE
Bending Strength
Building Applications
Research Status
Complete
Series
Pro Ligno
Summary
An overview on the mechanical and physical properties of cross laminated timber (solid wood panels) in the building industry and its use in timber construction is presented. Structure-property relations for solid wood based materials are discussed. Important properties, such as strength, sorption, diffusion, thermal conductivity in relation to the board structure are presented. By varying the structure, the properties can be optimized over a wide range. The focus of this publication lies on experimental works performed by Swiss researchers at the ETH Zürich.
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Effect of Manufacturing Parameters on Mechanical Properties of Southern Yellow Pine Cross Laminated Timbers

https://research.thinkwood.com/en/permalink/catalogue1314
Year of Publication
2017
Topic
Mechanical Properties
Material
CLT (Cross-Laminated Timber)
Author
Sharifnia, Houri
Hindman, Daniel
Publisher
ScienceDirect
Year of Publication
2017
Format
Journal Article
Material
CLT (Cross-Laminated Timber)
Topic
Mechanical Properties
Keywords
Manufacturing
Southern Yellow Pine
Polyurethane
Five Point Bending Test
Bending Stiffness
Bending Strength
Shear Stiffness
Research Status
Complete
Series
Construction and Building Materials
Summary
Development of cross laminated timber (CLT) manufacturing facilities will require an optimization of manufacturing parameters to ensure efficient production. This study examined the effects of press pressure, press time and the addition of water to bond surfaces for a CLT panel composed of southern pine lumber and polyurethane adhesive. Evaluation of the CLT panels used the five-point bending test for bending stiffness, bending strength and shear stiffness in addition to measuring the resistance to shear by compression loading. The shear strength and percent wood failure values obtained from the resistance to shear by compression loading. The optimal combination of manufacturing parameters studied was 100% press pressure and a press time of 80% of the manufacturer recommendations. The addition of water to the bondline surfaces was deemed unnecessary for CLT materials conforming to the PRG-320 standard. Comparison of mechanical properties with Grade V3 showed higher bending strength and shear stiffness values.
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36 records – page 1 of 4.