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Timber Mechanical Properties

Annex B (informative) of EN1995-1-2 (2004) provides the reduction factors of strength and modulus of elasticity at elevated temperatures for softwood as shown in Figures 1 and 2. The relationships take into account of the effects of transient thermal creep of timber and the transient states of moisture.

The reduction factors are mainly developed for the strength and elastic modulus parallel to grain of softwood. However, for compression and (rolling) shear with both stress components perpendicular to grain, the same reduction factors of strength may be applied as for compression parallel to grain.

In case of load-bearing lightweight timber assemblies, the reduction factors for strength and elastic modulus of timber frame members, including floor joists and wall studs, are separately considered in Annex C (informative) of EN1995-1-2 (see Light Timber Frame Construction).

Figure 1 Reduction factor for strength parallel to grain of softwood
Figure 2 Reduction factor for modulus of elasticity parallel to grain of softwood

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