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Evaluating Timoshenko Method for Analyzing CLT under Out-of-Plane Loading

https://research.thinkwood.com/en/permalink/catalogue2836
Year of Publication
2020
Topic
Mechanical Properties
Material
CLT (Cross-Laminated Timber)
Application
Ceilings
Decking
Floors
Walls
Author
Rahman, MD Tanvir
Ashraf, Mahmum
Ghabraie, Kazem
Subhani, Mahbube
Organization
Deakin University
Publisher
MDPI
Year of Publication
2020
Format
Journal Article
Material
CLT (Cross-Laminated Timber)
Application
Ceilings
Decking
Floors
Walls
Topic
Mechanical Properties
Keywords
Rolling Shear
Shear Deformation
Timoshenko Theory of Bending
Shear Stiffness
Finite Element Method (FEM)
Research Status
Complete
Series
Buildings
Summary
Cross-laminated timber (CLT) is an engineered wood product made up of layers of structurally graded timber, where subsequent layers are oriented orthogonally to each other. In CLT, the layers oriented in transverse direction, generally termed as cross-layer, are subjected to shear in radial–tangential plane, which is commonly known as rolling shear. As the shear modulus of cross-layers is significantly lower than that in other planes, CLT exhibits higher shear deformation under out-of-plane loading in contrast to other engineered wood products such as laminated veneer lumber (LVL) and glue laminated timber (GLT). Several analytical methods such as Timoshenko, modified gamma and shear analogy methods were proposed to account for this excessive shear deformation in CLT. This paper focuses on the effectiveness of Timoshenko method in hybrid CLT, in which hardwood cross-layers are used due to their higher rolling shear modulus. A comprehensive numerical study was conducted and obtained results were carefully analyzed for a range of hybrid combinations. It was observed that Timoshenko method could not accurately predict the shear response of CLTs with hardwood cross layers. Comprehensive parametric analysis was conducted to generate reliable numerical results, which were subsequently used to propose modified design equations for hybrid CLTs.
Online Access
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