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Cross Laminated Timber Reinforced with Carbon Fibre

https://research.thinkwood.com/en/permalink/catalogue2661
Topic
Mechanical Properties
Material
CLT (Cross-Laminated Timber)
Author
Cao, Xinlei
Organization
University of Alberta
Material
CLT (Cross-Laminated Timber)
Topic
Mechanical Properties
Keywords
Carbon Fiber
Flexural Stiffness
Stress Distribution
Analytical Model
Finite Element Method (FEM)
Research Status
In Progress
Summary
Although engineered wood products such as glued laminated timber (glulam) and cross-laminated timber (CLT) have successfully eliminated the flaws inherently exist in conventional wood products, they are still not comparable with steel and concrete in terms of strength and stiffness. Among all different options for reinforcement, Carbon Fibre is relatively popular due to its high tensile strength, low weight, and easy installation. This study presents an analysis of flexural stiffness and stress distributions of CLT panels reinforced with carbon fibre mats, based on an analytical method and finite element method (FEM).
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Duration-Of-Load Effect on the Rolling Shear Strength of Cross Laminated Timber: Duration-Of-Load Tests and Damage Accumulation Model

https://research.thinkwood.com/en/permalink/catalogue228
Year of Publication
2015
Topic
Mechanical Properties
Material
CLT (Cross-Laminated Timber)
Author
Li, Yuan
Lam, Frank
Organization
University of British Columbia
Year of Publication
2015
Format
Thesis
Material
CLT (Cross-Laminated Timber)
Topic
Mechanical Properties
Keywords
Duration of Load
Long-term
Mountain Pine Beetle
Rolling Shear Strength
Stiffness
Strength
Stress Distribution
Research Status
Complete
Summary
In this study, the duration-of-load (DOL) effect on the rolling shear strength of cross laminated timber (CLT) was evaluated. A stress-based damage accumulation model is chosen to evaluate the DOL effect on the rolling shear strength of CLT. This model incorporates the established short-term rolling shear strength of material and predicts the time to failure under arbitrary loading history. The model was calibrated and verified based on the test data from low cycle trapezoidal fatigue tests (the damage accumulation tests). The long-term rolling shear behaviour of CLT can then be evaluated from this verified model. As the developed damage accumulation model is a probabilistic model, it can be incorporated into a time-reliability study. Therefore, a reliability assessment of the CLT products was performed considering short-term and snow loading cases. The reliability analysis results and factors reflecting the DOL effect on the rolling shear strength of CLT are compared and discussed. The results suggest that the DOL rolling shear strength adjustment factor for CLT is more severe than the general DOL adjustment factor for lumber; and, this difference should be considered in the introduction of CLT into the building codes for engineered wood design.
Online Access
Free
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Glulam Beams with Holes

https://research.thinkwood.com/en/permalink/catalogue211
Year of Publication
2014
Topic
Mechanical Properties
Material
Glulam (Glue-Laminated Timber)
Application
Beams
Author
Jelec, Mario
Varevac, Damir
Zovkic, Jurko
Organization
University of Osijek
Year of Publication
2014
Format
Journal Article
Material
Glulam (Glue-Laminated Timber)
Application
Beams
Topic
Mechanical Properties
Keywords
Finite Element Model
Openings
Numerical model
Stress Distribution
Research Status
Complete
Series
e-GFOS
Summary
This paper provides a systematic review of research on glued laminated timber beams with circular and rectangular openings. Experiments on girders with unreinforced openings varied several parameters, including the girder span and shape, opening position and shape, and the relationship between the stress state near the opening and the ratio of opening size to girder size. We compare experimental results with recommendations given by DIN 1052:2004-08, DIN EN 1995-1-1/NA: 2010, prEN 1995-1-1: Final Draft, analytical expressions, and other relevant standards, as well as with the results of numerical models using the finite element method. Because of its myriad complexities and uncertainties, this area remains open for further research and for implementation of that research into practical design guidelines and rules.
Online Access
Free
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On the distribution of internal forces in single-storey CLT symmetric shear-walls with openings

https://research.thinkwood.com/en/permalink/catalogue2850
Year of Publication
2021
Topic
Mechanical Properties
Material
CLT (Cross-Laminated Timber)
Application
Shear Walls
Author
Casagrande, Daniele
Fanti, Riccardo
Greco, Marco
Gavric, Igor
Polastri, Andrea
Organization
Institute of Bioeconomy - National Research Council of Italy
University of Trento
University of Primorska
Publisher
Elsevier
Year of Publication
2021
Format
Journal Article
Material
CLT (Cross-Laminated Timber)
Application
Shear Walls
Topic
Mechanical Properties
Keywords
Shear Walls
Openings
Stress Distribution
Finite Element Modeling
Research Status
Complete
Series
Structures
Summary
This paper presents a numerical and analytical study on single-storey cross-laminated timber (CLT) shear-walls with openings subjected to lateral loads. The main objective was to investigate the location and distribution of maximum values of axial and shear forces in relevant wall sections. The influence of parameters such as wall geometry (different sizes of wall openings, door openings, lintel/parapet lengths and heights, wall thickness) and different stiffness levels of mechanical anchors for CLT wall connection with floor/foundation were studied. Finite element (FE) parametric analyses were performed on a set of single-storey CLT shear-walls with door and window openings and were compared with analytical models for determination of internal forces. The importance of wall connections’ flexibility was identified, as the distribution of internal forces in walls with rigid and flexible anchors were considerably different. The obtained outcomes of this study provide a solid base for the next step, an experimental investigation of in-plane internal force distribution in CLT walls with openings, which will serve for further development of numerical, analytical and design approaches.
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Free
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Structural Performance of Portal Frame Constructed with Japanese Cedar Glulam

https://research.thinkwood.com/en/permalink/catalogue698
Year of Publication
2014
Topic
Design and Systems
Mechanical Properties
Material
Glulam (Glue-Laminated Timber)
Application
Frames
Author
Yeh, Min-Chyuan
Lin, Yu-Li
Deng, Shu-Yu
Year of Publication
2014
Format
Conference Paper
Material
Glulam (Glue-Laminated Timber)
Application
Frames
Topic
Design and Systems
Mechanical Properties
Keywords
Cedar
Portal Frame
Lateral Cyclic Load
Pins
Moment Resistance
Stress Distribution
Conference
World Conference on Timber Engineering
Research Status
Complete
Notes
August 10-14, 2014, Quebec City, Canada
Summary
Feasibility of using rapid grown Japanese cedar glulam for constructing a portal frame was examined. A 2500x3000-mm portal frame was constructed with 140x305-mm glulam members and subjected to a lateral cyclic load. The connections between post and beam members were fastened with 8 16-mm pins. Resulted moment resistance of the frame fastened with pins in square placement performed better than that with in circular placement. While the inserted metal plate in L-type showed higher initial stiffness and energy absorption than that in straight metal plate. The stress distribution of glulam post indicated shifts of neutral axis and deflection point as the cyclic load increases.
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Free
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