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4. Mechanical properties of wood
Mechanical characteristics vary between different wood species, and even within the same species.
The choice of a wood species for structural use depends on its mechanical properties: bending strength, tensile strength, compression strength, shear strength, modulus of elasticity and density. These stress values depend on the species, product quality and actual moisture content of the wood (the reference moisture content is 12%, with a correction coefficient applied for higher values).
4.1 Mechanical grades of wood
Even today, two grading methods are used: visual grading and mechanical grading.
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Reference documents
- Building work – Construction of timber-frame buildings and houses - NF DTU 31.2 - 01-11
- Rules for using wood in construction – Visual grading for structural use of French sawn softwood and hardwood - NF B 52-001 - 08-11
- CB 71 rules – Calculation and design rules for timber structures - DTU P 21-701 - 06-84
- Wood preservatives – Determination of preventive action against...
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