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7. Bending stress check in the flanges and the web

Because the mean modulus of elasticity of the flange material is greater than that of the web, only check the stresses in the flanges at the final deformation condition and those in the web at the instantaneous condition.

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 flange due to bending - final condition:

Bending stress in the top and bottom flange, af.c.max.d.c

Md H

Ic.ef 2

Bending strength of the flange, /m.d (Equation (7.11))

bending stress in flanges is OK Stress in the web due to bending - instantaneous condition:

Bending stress in the web, aw.c.d (equation (7.18a))

Bending strength of the web in compression, /c.w.d (equation (7.22))

Bending strength of the web in tension, /t.w.d (equation (7.23))

Stress in the flange due to axial stress - final condition:

Axial stress in the top and bottom flange, af.c.d.c (equation (7.12b))

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