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2. Timber strength properties

Table 1.3, strength class C16 (BS EN 338:2003(E), Table 1)

Characteristic compression strength fc 0 k = 17/mm2

parallel to the grain, fc.0.k

Characteristic compressive strength perpendicular to the grain, fc.90.k

Fifth-percentile modulus of elasticity parallel to the grain, E005

3. Partial safety factors

Table 2.8(UKNA to BS EN 1990:2002, Table NA.A1.2(B)) for the ULS

Permanent actions, yg

Variable actions, yq

Material factor for solid timber, ym

4. Actions per stud

Characteristic permanent compressive action, Gk

Characteristic long-term compressive variable action, Qk

Design compressive action for the critical load combination, Nd (Table 2.8, equation (c) using the unfavourable condition variable action)

5. Modification factors

Factor for long-duration loading and service class 2, £mod.i0ng Table 2.4 (EC5, Table 3.1))

Adopt bearing factor, kc.90 = 1 (equation (4.22) (EC5, 6.1.5 (2)))

kmod.long 0-7

Compression strength of a stud

The critical design load case at the ULS will be due to the combination of permanent and unfavourable long-duration variable action:

Design compression stress in a stud,

Design compression strength of a stud, /c 0 d fc.O.d

0 0

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