2 Iz

Radius of gyration about the z-z axis, iz =

Slenderness ratio about the zā€”z axis, Xz Xz ā€” ā€”

Xz 129.9

2. Timber properties

Table 1.3, strength class C24 (BS EN 338:2003(E), Table 1)

Characteristic bending strength about fm.y.k = 24 N/mm2 the y-y axis, fm.y.k

Characteristic bending strength about fm.z.k = 24 N/mm2

Characteristic compression strength parallel to the grain, /c 0 k

Fifth-percentile modulus of elasticity parallel to the grain, E0 05

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

Characteristic permanent compressive action, G k

Characteristic short-term compressive variable action, Q k

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

Moment about the y-y axis: Eccentricity, ez


Moment about the z-z axis: Eccentricity, ey

Design moment about the z-z axis, Mz.d

5. Modification factors

Factor for medium-duration loading and service class 2, (Table 2.4 (EC5, Table 3.1))

System strength factor, ksys - not relevant

Depth factor for solid timber - bending about the y-y axis, k1h (Table 2.11 (EC5, 3.2))

Depth factor for solid timber - bending about the z-z axis, k2h (Table 2.11 (EC5, 3.2)) (Mathcad adjusted to make it dimensionally correct)

0 0

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