Rothoblaas - Wood screws and connectors Page 136
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STRUCTURAL REINFORCEMENT RESPONSE TO STRESS Wood is an anisotropic material. Therefore, it has different mechanical characteristics depending on the direction of the grain and the stress. The anisotropy of the material derives from its cellular organisation: wood consists of layers of fibres welded to each other by lignin and can be compared to extremely thin straws, known as tracheids. The physical structure determines the mechanical characteristics of the wood: • great resistance and rigidity for stresses in the direction of the axis of the fibres; • reduced efficiency for stresses perpendicular to the direction of the fibres, in particular for tensile stresses. 01 | 02 In the context of reinforcements, the main mono-axial stresses to which wood may be subjected are: 01 | 02 TENSION PERPENDICULAR TO THE FIBRES 03 COMPRESSION PERPENDICULAR TO THE FIBRES 03 04 LONGITUDINAL SHEAR 04 136 | STRUCTURAL REINFORCEMENT | STRUCTURES
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