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12 records – page 1 of 2.

Development of Adhesive Free Engineered Wood Products - Towards Adhesive Free Timber Buildings

https://research.thinkwood.com/en/permalink/catalogue2029
Year of Publication
2018
Topic
Connections
Design and Systems
Environmental Impact
Mechanical Properties
Material
CLT (Cross-Laminated Timber)
Glulam (Glue-Laminated Timber)

Effects of the Thickness of Cross-Laminated Timber (CLT) Panels Made from Irish Sitka Spruce on Mechanical Performance in Bending and Shear

https://research.thinkwood.com/en/permalink/catalogue990
Year of Publication
2016
Topic
Mechanical Properties
Material
CLT (Cross-Laminated Timber)
Author
Sikora, Karol
McPolin, Daniel
Harte, Annette
Publisher
ScienceDirect
Year of Publication
2016
Country of Publication
Netherlands
Format
Journal Article
Material
CLT (Cross-Laminated Timber)
Topic
Mechanical Properties
Keywords
Sitka Spruce
Thickness
Bending Stiffness
Rolling Shear Strength
Language
English
Research Status
Complete
Series
Construction and Building Materials
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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Free
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Evaluation of the Structural Behaviour of Beam-Beam Connection Systems Using Compressed Wood Dowels and Plates

https://research.thinkwood.com/en/permalink/catalogue2050
Year of Publication
2018
Topic
Connections
Material
Glulam (Glue-Laminated Timber)
Application
Beams

Failure Modes and Reinforcement Techniques for Timber Beams – State of the Art

https://research.thinkwood.com/en/permalink/catalogue11
Year of Publication
2015
Topic
Serviceability
Material
Solid-sawn Heavy Timber
Application
Beams
Author
Harte, Annette
Franke, Bettina
Franke, Steffen
Publisher
ScienceDirect
Year of Publication
2015
Country of Publication
Netherlands
Format
Journal Article
Material
Solid-sawn Heavy Timber
Application
Beams
Topic
Serviceability
Keywords
Damage
Deterioration
Failure
Fasteners
Large Span
Loading
Reinforcement
Retrofit
Language
English
Research Status
Complete
Series
Construction and Building Materials
Summary
Highly loaded and large span timber beams are often used for halls, public buildings or bridges. Reinforcement of beams may be required to extend the life of the structure, due to deterioration or damage to the material/product or change of use. The paper summarises methods to repair or enhance the structural performance of timber beams. The main materials/products cross sections and geometries used for timber beam are presented. Furthermore, their general failure modes are described and typical retrofitting and reinforcement techniques are given. The techniques include wood to wood replacements, use of mechanical fasteners and additional strengthening materials/products.
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Influence of Connection Systems on Serviceability Response of CLT Timber Flooring

https://research.thinkwood.com/en/permalink/catalogue1690
Year of Publication
2016
Topic
Mechanical Properties
Acoustics and Vibration
Serviceability
Material
CLT (Cross-Laminated Timber)
Application
Floors
Author
Uí Chúláin, Caitríona
Sikora, Karol
Harte, Annette
Year of Publication
2016
Country of Publication
Austria
Format
Conference Paper
Material
CLT (Cross-Laminated Timber)
Application
Floors
Topic
Mechanical Properties
Acoustics and Vibration
Serviceability
Keywords
Finite Element Analysis
Support Conditions
Two-Way
One-Way
Deflection
Displacement
Frequency
Language
English
Conference
World Conference on Timber Engineering
Research Status
Complete
Notes
August 22-25, 2016, Vienna, Austria p. 4246-4253
Summary
In this paper finite element analysis of a five layer cross-laminated timber (CLT) rectangular floor is presented. The model was developed using 3D shell elements with linear elastic orthotropic material properties. Support conditions analysed included fully fixed, semi-rigid and simply supported, and both one and two-way span conditions were considered. For each case, the serviceability deflection was determined from a static small displacement analysis and the first three natural frequencies bending and torsional mode shapes, within a 0-80 Hz range, from mode frequency analysis. The analysis shows that the maximum displacement and frequency response are significantly impacted by the support stiffness and the number of edges supported. These results will contribute to determining the optimum fixing configuration with regard to serviceability limit design (SLD) for various CLT floor geometries.
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The Influence of Panel Lay-Up on the Characteristic Bending and Rolling Shear Strength of CLT

https://research.thinkwood.com/en/permalink/catalogue2119
Year of Publication
2018
Topic
Design and Systems
Mechanical Properties
Material
CLT (Cross-Laminated Timber)
Application
Wood Building Systems

The Influence of Panel Lay-Up on the Characteristic Bending and Rolling Shear Strength of CLT

https://research.thinkwood.com/en/permalink/catalogue2179
Year of Publication
2018
Topic
Mechanical Properties
Material
CLT (Cross-Laminated Timber)
Author
O’Ceallaigh, Conan
Sikora, Karol
Harte, Annette
Publisher
MDPI
Year of Publication
2018
Country of Publication
Switzerland
Format
Journal Article
Material
CLT (Cross-Laminated Timber)
Topic
Mechanical Properties
Keywords
Strength
Lay-up
Rolling Shear Strength
Bending Strength
Language
English
Research Status
Complete
Series
Buildings
ISSN
2075-5309
Online Access
Free
Resource Link
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Nonlinear Numerical Modelling of FRP Reinforced Glued Laminated Timber

https://research.thinkwood.com/en/permalink/catalogue73
Year of Publication
2013
Topic
Design and Systems
Mechanical Properties
Material
Glulam (Glue-Laminated Timber)
Application
Beams
Author
Raftery, Gary
Harte, Annette
Publisher
ScienceDirect
Year of Publication
2013
Country of Publication
Netherlands
Format
Journal Article
Material
Glulam (Glue-Laminated Timber)
Application
Beams
Topic
Design and Systems
Mechanical Properties
Keywords
Fiber Reinforced Polymer
Finite Element Model
Flexural
Hybrid
Low-Grade
Model
Modulus of Rupture
Reinforcement
Stiffness
Strength
Spruce
Language
English
Research Status
Complete
Series
Composites Part B: Engineering
Summary
Fibre-reinforced polymers (FRPs) are effective in the flexural stiffening and strengthening of structural members. Such systems can be optimised if accurate numerical models are developed. At present, limited information is available in the literature on numerical models that can predict with good accuracy the nonlinear behaviour of FRP reinforced low-grade glued laminated timber beams. This paper discusses the development of a finite element model, which incorporates nonlinear material modelling and nonlinear geometry to predict the load–deflection behaviour, stiffness, ultimate moment capacity and strain distribution of FRP plate reinforced glued laminated timber beams manufactured from mechanically stress graded spruce. Beams with and without sacrificial laminations are modelled and their performance is compared to unreinforced glued laminated timber beams. The model employed anisotropic plasticity theory for the timber in compression. The failure model used was the maximum stress criterion. Strong agreement was obtained between the predicted behaviour and the associated experimental findings. It was deduced from comparing the results from the numerical model with experimental findings that the FRP plate succeeds in increasing the performance of the adjacent timber significantly. The model is a useful tool for examination of the effect of reinforcement percentage and will be used for optimisation of the hybrid beam.
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Review of State of the Art of Dowel Laminated Timber Members and Densified Wood Materials as Sustainable Engineered Wood Products for Construction and Building Applications

https://research.thinkwood.com/en/permalink/catalogue2385
Year of Publication
2020
Topic
Design and Systems
Mechanical Properties
Material
DLT (Dowel Laminated Timber)
Application
Wood Building Systems

Shear Strength and Durability Testing of Adhesive Bonds in Cross-Laminated Timber

https://research.thinkwood.com/en/permalink/catalogue535
Year of Publication
2015
Topic
Mechanical Properties
Material
CLT (Cross-Laminated Timber)
Author
Sikora, Karol
McPolin, Daniel
Harte, Annette
Publisher
Taylor&Francis Online
Year of Publication
2015
Country of Publication
United Kingdom
Format
Journal Article
Material
CLT (Cross-Laminated Timber)
Topic
Mechanical Properties
Keywords
Phenol-Resorcinol Formaldehyde
Polyurethane
Adhesives
Block Shear Tests
Shear Strength
Language
English
Research Status
Complete
Series
The Journal of Adhesion
Summary
This paper addresses the quality of the interface- and edge-bonded joints in layers of cross-laminated timber (CLT) panels. The shear performance was studied to assess the suitability of two different adhesives, polyurethane (PUR) and phenol–resorcinol–formaldehyde (PRF), and to determine the optimum clamping pressure. Since there is no established testing procedure to determine the shear strength of the surface bonds between layers in a CLT panel, block shear tests of specimens in two different configurations were carried out, and further shear tests of edge-bonded specimen in two configurations were performed. Delamination tests were performed on samples which were subjected to accelerated aging to assess the durability of bonds in severe environmental conditions. Both tested adhesives produced boards with shear strength values within the edge-bonding requirements of prEN 16351 for all manufacturing pressures. While the PUR specimens had higher shear strength values, the PRF specimens demonstrated superior durability characteristics in the delamination tests. It seems that the test protocol introduced in this study for crosslam-bonded specimens, cut from a CLT panel, and placed in the shearing tool horizontally, accurately reflects the shearing strength of glue lines in CLT
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Free
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12 records – page 1 of 2.