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Final - transformed section properties:

The largest stress to strength ratio will be the larger of the permanent action/kmod.perm and the combined permanent and variable action/£mod.med. Let the ratio of one to the other be r:

kmod. short

i.e. the variable loading will produce the higher stress/strength ratio, so the factor f2 will be associated with variable loading.

The f2 factor for this loading condition is f2 = 0

Consequently, for this condition the instantaneous and final properties will be the same. We only need to analyse for the instantaneous condition.

7. Bending stress check in the flanges

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

Stress in the flanges due to bending:

Bending stress (compression) in the top flange af.c.max.d

Ief yt htf T

Bending stress (tension) in the bottom flange, Of.tmax.d

Axial strength of the top flange,

Yosb.m

Axial strength of the bottom flange, /oSB.t.0.d kmod.short ' ksys ' fOSB.t.0.k

Yosb.m

/osB.t.o.d = 6.22 N/mm2 Stresses in the top and bottom flanges are OK

8. Bending and shear stress check in the web

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

Maximum distance from the NA to the extreme fibre, y1

Bending stress in the web, aw.c.d.c

Ief \E0SB.c.0.mean

Bending strength of the web, /w.d kmod.short ' ksys ' kh ' /m.k

0 0

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