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Mechanical Characterization and Seismic Behaviour of Cross Laminated Timber Panels Made of Chilean Radiata Pine

https://research.thinkwood.com/en/permalink/catalogue1730
Year of Publication
2016
Topic
Mechanical Properties
Seismic
Material
CLT (Cross-Laminated Timber)
Author
Pérez Pulgar, Eduardo
González Soto, Paulina
Saavedra Flores, Erick
Tapia Vavra, Sergio
Torelli Conde, Jorge
Orellana Parada, Sebastián
Year of Publication
2016
Format
Conference Paper
Material
CLT (Cross-Laminated Timber)
Topic
Mechanical Properties
Seismic
Keywords
Chile
Seismic Behaviour
Pine
Conference
World Conference on Timber Engineering
Research Status
Complete
Notes
August 22-25, 2016, Vienna, Austria p. 4746-4753
Summary
The use of cross-laminated timber (CLT or XLAM) in the multi-storey buildings construction sector has been spreading in Europe and North America over the last twenty years. Considering that Chile has one of the largest radiata pine forest resources of the world, it is clearly possible to introduce this timber construction system in Chile. Therefore the mechanical characterization and seismic behaviour of 3-ply cross-laminated timber panels made of Chilean radiata pine were studied. The panels (2.5 m high, 1.2 m wide and 0.12 m thick) were manufactured in the Materials Research Laboratory of the Civil Engineering Department at the Universidad de Santiago de Chile (LIMUSUSACH) in accordance with the current Chilean standards, which are based on ASTM standards. The New Zealand standard (BRANZ P21) for cyclic tests was also applied. These panels are intended to be used for the design of earthquake-resistant systems in mid-rise buildings.
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Multi-Scale Modelling of Rolling Shear Failure in Cross-Laminated Timber Structures by Homogenisation and Cohesive Zone Models

https://research.thinkwood.com/en/permalink/catalogue422
Year of Publication
2016
Topic
Mechanical Properties
Material
CLT (Cross-Laminated Timber)
Author
Saavedra Flores, Erick
Saavedra, Karin
Hinojosa, Jorge
Chandra, Yatish
Das, Raj
Publisher
ScienceDirect
Year of Publication
2016
Format
Journal Article
Material
CLT (Cross-Laminated Timber)
Topic
Mechanical Properties
Keywords
Rolling shear
Failure
Cohesive Zone Model
Multi-Scale Modelling
Homogenisation
Research Status
Complete
Series
International Journal of Solids and Structures
Summary
In this paper we investigate the rolling shear failure in cross-laminated timber structures by homogenisation and cohesive zone models. In order to predict the structural response, four spatial scales are interlinked within a purely kinematic multi-scale modelling framework. The constitutive description has incorporated information coming from the wood cell-wall in the order of a few nanometres, wood fibres with dimensions of tens of micrometres and growth rings described by a few millimetres. The computational homogenisation scheme is solved sequentially from the lowest to the highest level in order to determine the effective mechanical properties for the fourth (structural) scale represented by a cross-laminated timber plate with dimensions of the order of one meter. In order to simulate the cracking in the material, a cohesive zone model is adopted at the homogenised macroscopic scale. The finite element problem is then solved using a mixed domain decomposition strategy due to its huge number of unknowns. This approach allows us to capture interlaminar and inter-fibre cracking and to solve the macroscopic equilibrium problem using parallel computations. Our numerical predictions are compared with experimental results and are validated successfully. In particular, we study the influence of wood density, edge-gluing and span-to-depth ratio on the rolling shear failure in cross-laminated timber.
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Free
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Numerical Study on De Elastic Buckling of CLT Walls Subjected to Compressive Loads

https://research.thinkwood.com/en/permalink/catalogue2169
Year of Publication
2019
Topic
Design and Systems
Connections
Material
CLT (Cross-Laminated Timber)
Application
Walls
Author
Saavedra Flores, Erick
Saavedra, Karin
Pina, Juan Carlos
Yanez, Sergio
Guzmán, Carlos Felipe
Year of Publication
2019
Format
Conference Paper
Material
CLT (Cross-Laminated Timber)
Application
Walls
Topic
Design and Systems
Connections
Keywords
Buckling
Panels
Buckling Behavior
Buckling Loads
Conference
CompWood
Research Status
Complete
Summary
In this work, a numerical-experimental approach is used to study the elastic buckling of CLT panels. First, a finite element-based multi-scale model is developed to study the linear elastic buckling behaviour of CLT panels. The model incorporates wood’s most relevant microstructural features, such as the volume fraction of hemicellulose, lignin and cellulose, their mechanical and physical properties, microfibril angle, etc.; which are crucial to capture the inherent orthotropic nature of wood observed at the macroscopic level. Furthermore, the values of key microstructural parameters are determined through a parameter identification procedure, in which experimentally measured values of density and longitudinal Young’s modulus of radiata pine grown in Chile are used as target values. The model is successfully validated with results from buckling tests performed on CLT panels’ specimens with different thickness and slenderness ratios. The validation clearly shows the capability of the model to predict the buckling response of CLT panels. Finally, the model is used illustrate how parameters such as wood density and panel number of layers influence the buckling response of CLT panels.
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Progressive Damage Modelling in Cross-Laminated Timber Structures by Computational Homogenisation and Cohesive Zone Models

https://research.thinkwood.com/en/permalink/catalogue1608
Year of Publication
2016
Topic
Mechanical Properties
Material
CLT (Cross-Laminated Timber)
Author
Saavedra Flores, Erick
Saavedra, Karin
Hinojosa, Jorge
Das, Raj
Year of Publication
2016
Format
Conference Paper
Material
CLT (Cross-Laminated Timber)
Topic
Mechanical Properties
Keywords
Damage
Cohesive Zone Model
Conference
World Conference on Timber Engineering
Research Status
Complete
Notes
August 22-25, 2016, Vienna, Austria p. 2116-2123
Summary
In this paper we investigate the damage process in cross-laminated timber (CLT) structures by a computational homogenisation approach enriched with cohesive zone models. In order to predict the undamaged structural response, four spatial scales are interlinked within a multi-scale finite element modelling scheme. To simulate the cracking process in the material, a cohesive zone model (CZM) is adopted at the homogenised macroscopic scale. This double approach allows us to model successfully the progressive damage process in CLT plates subject to threepoint bending.
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Free
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