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Analysis of the Timber-Concrete Composite Systems with Ductile Connection

https://research.thinkwood.com/en/permalink/catalogue113
Year of Publication
2013
Topic
Mechanical Properties
Material
Timber-Concrete Composite
Author
Zhang, Chao
Organization
University of Toronto
Year of Publication
2013
Country of Publication
Canada
Format
Thesis
Material
Timber-Concrete Composite
Topic
Mechanical Properties
Keywords
Bending
Ductility
Model
Load Deflection
Tension
Shear Connection
Language
English
Research Status
Complete
Summary
In timber-concrete composite systems, timber and concrete are inherently brittle materials that behave linearly elastic in both tension and bending. However, the shear connection between the members can exhibit significant ductility. It is therefore possible to develop timber-concrete composite systems with ductile connection that behave in a ductile fashion. This study illustrates the use of an elastic-perfectly plastic analytical approach to this problem. In addition, the study proposes an incremental method for predicting the nonlinear load-deflection response of the composite system. The accuracy of the analytical model is confirmed with a computer model, and numerical solutions of the analytical model are compared to experimental results from the bending tests conducted by previous researchers. Reasonable agreement is found from the comparisons, which validates the capacity of the analytical model in predicting the structural behaviour of the timber-concrete composite systems in both elastic and post-elastic stages.
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Application of Quasi-Brittle Material Model for Analysis of Timber Members

https://research.thinkwood.com/en/permalink/catalogue925
Year of Publication
2014
Material
Solid-sawn Heavy Timber
Author
Khorsandnia, Nima
Crews, Keith
Publisher
Taylor&Francis Online
Year of Publication
2014
Country of Publication
United Kingdom
Format
Journal Article
Material
Solid-sawn Heavy Timber
Keywords
ultimate load
Finite Element Model
Load-Deflection Response
Failure Load
Four Point Bending Test
Language
English
Research Status
Complete
Series
Australian Journal of Structural Engineering
Summary
Over the last two decades many constitutive models with different degrees of accuracy have been developed for analysis of sawn timber and engineered wood products. However, most of the existing models for analysis of timber members are not particularly practical to implement, owing to the large number of material properties (and associated testing) required for calibration of the constitutive law. In order to overcome this limitation, this paper presents details of 1D, 2D and 3D non-linear fi nite element (FE) models that take advantage of a quasi-brittle material model, requiring a minimum number of material properties to capture the load-defl ection response and failure load of timber beams under 4-point bending. In order to validate the model, four tapered timber piles with circular cross-section (two plains and two retrofi tted with steel jacket) were tested and analysed with the proposed 3D FE modelling technique; and a good correlation between experimentally observed and numerically captured ultimate load was observed. Consequently, it was concluded that the developed FE models used in conjunction with the quasi-brittle constitutive law were able to adequately capture the failure load and load-defl ection response of the fl exural timber elements.
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Experimental and Analytical Investigation of Short-Term Behaviour of LVL–Concrete Composite Connections And Beams

https://research.thinkwood.com/en/permalink/catalogue150
Year of Publication
2012
Topic
Connections
Design and Systems
Mechanical Properties
Material
LVL (Laminated Veneer Lumber)
Timber-Concrete Composite
Application
Beams
Author
Khorsandnia, Nima
Valipour, Hamid
Crews, Keith
Publisher
ScienceDirect
Year of Publication
2012
Country of Publication
Netherlands
Format
Journal Article
Material
LVL (Laminated Veneer Lumber)
Timber-Concrete Composite
Application
Beams
Topic
Connections
Design and Systems
Mechanical Properties
Keywords
Four Point Bending Test
Screws
Load Deflection
Model
Full Scale
Language
English
Research Status
Complete
Series
Construction and Building Materials
Summary
This paper reports the results of experimental push-out tests on three different types of timber–concrete composite (TCC) connections, including normal screw, SFS and bird-mouth. The load-slip diagrams obtained from lab tests are employed to calculate the slip modulus of the connections for serviceability, ultimate and near collapse cases based on Eurocode 5 recommendations. Additionally, four full-scale TCC beams with normal screw, SFS and bird-mouth are constructed and tested under four-point bending within the serviceability load range to verify the slip modulus of connections which derived from the push-out tests. Further, based on the experimental results and using nonlinear regression, an analytical model each one of the connections is derived which can be easily incorporated into nonlinear FE analyses of TCC beams.
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Numerical Modelling of Glulam Beams Externally Reinforced with CFRP Plates

https://research.thinkwood.com/en/permalink/catalogue1624
Year of Publication
2016
Topic
Mechanical Properties
Material
Glulam (Glue-Laminated Timber)
Application
Beams
Author
Glišovic, Ivan
Pavlovic, Marko
Stevanovic, Boško
Todorovic, Marija
Year of Publication
2016
Country of Publication
Austria
Format
Conference Paper
Material
Glulam (Glue-Laminated Timber)
Application
Beams
Topic
Mechanical Properties
Keywords
Bending Behaviour
CFRP
Finite Element Model
Load Deflection
Stiffness
Load Carrying Capacity
Strain
Reinforcement
Language
English
Conference
World Conference on Timber Engineering
Research Status
Complete
Notes
August 22-25, 2016, Vienna, Austria p. 2634-2641
Summary
Timber beams can effectively be reinforced using externally bonded fibre reinforced polymer (FRP) composites. This paper describes a nonlinear 3-dimensional finite element model which was developed in order to accurately simulate the bending behaviour of unreinforced and carbon FRP plate reinforced glulam beams. The model incorporates suitable constitutive relationship for each material and utilises anisotropic plasticity theory for timber in compression. Failure of beams was modelled based on the maximum stress criterion. The results of the finite element analysis showed a good agreement with experimental findings for load-deflection behaviour, stiffness, ultimate load carrying capacity and strain profile distribution of unreinforced and reinforced beams. The proposed model can be used to examine the effect of different geometries or materials on the mechanical performance of reinforced system.
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Stub Girder Flooring System for Timber Construction

https://research.thinkwood.com/en/permalink/catalogue1006
Year of Publication
2014
Topic
Design and Systems
Material
CLT (Cross-Laminated Timber)
LVL (Laminated Veneer Lumber)
Application
Floors
Author
Masoudnia, Reza
Quenneville, Pierre
Year of Publication
2014
Country of Publication
Canada
Format
Conference Paper
Material
CLT (Cross-Laminated Timber)
LVL (Laminated Veneer Lumber)
Application
Floors
Topic
Design and Systems
Keywords
Stub girder
Gerber beam
Load Deflection
Language
English
Conference
World Conference on Timber Engineering
Research Status
Complete
Notes
August 10-14, 2014, Quebec City, Canada
Summary
This article presents the concept of the stub girder flooring system adapted to timber structures. The floor system consists of LVL beams covered by CLT floor panel separated by a series of short shear connection called stubs. The paper focusses on the analytical development to predict the optimized flooring system dimensions for future experimental tests. The proposed model contains structural parameters such as the main girder and secondary Gerber beam, the stubs and the CLT panel with various materials. This initial investigation into this concept suggests that the flooring system can be a possible alternative for mid to long span frames.
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