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2. Timber properties

Table 1.3, strength class C24 (BS EN 338:2003(E), Table I)

Characteristic tensile strength parallel to /t.0.k = 14 N/mm2 the grain, /Uk

Characteristic bending strength about the /m.y.k = 24 N/mm2

Characteristic bending strength about the /m.z.k = 24 N/mm2 z-z axis, /m.z.k

3. Partial safety factors

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

Permanent actions, yg Yg = 1-35

Variable actions, yq Yq = 1.5

Table 2.6 (UKNA to EC5, Table NA.3) Material factor for solid timber, yM YM = 1.3

4. Actions

Characteristic permanent compressive Gk = 1.0 kN action, G k

Characteristic medium-term compressive Qk = 4.0 kN variable action, Q k

Design tensile action for the critical load Nd = yg • Gk + yq • Qk combination, Nd

(Table 2.8, equation (c) using the Nd = 6.75 x 103 N

unfavourable condition variable action)

Characteristic moment due to the variable MQyk = 1.0 kN m action about the y-y axis, MQ.y.k

Design moment about the y -y axis due to My.d = yq • MQ.y.k My.d = 1.5 kN m the variable actions, My.d

Characteristic moment due to the variable Mqzî = 0.1 kN m action about the z-z axis, Mqzî

Design moment about the z-z axis due to the variable actions,

Mz.d

5. Modification factors

Factor for medium-duration loading and service class 2, kmod.med

System strength factor, ksys - not ksys = 1 relevant

Size factor for bending:

Depth factor for solid timber - kh = bending about y-y axis, kh (Table 2.11 (EC5, 3.2)) 1-3

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