Calculation of the shear stress due to warping

The shear stress due to warping is given by (Ref.[2] 7.4.3.2.3, Ref.[3])

Mxs

the warping torque (see "Standard diagrams for warping torque, bimoment and the St.Venant torsion")

wM

the unit warping

Cm

the warping constant

t

the element thickness

I sections

The  shear stress due to warping is calculated in the critical points (see circles in figure)

For I sections, we have the following :

U sections,  Σ sections

Starting from the wM diagram, we calculate the value

for the critical points.

The  shear stress due to warping is calculated in these critical points (see circles in figures)

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