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Does the web need a shear buckling check?

Web slenderness limit above which the shear buckling resistance of an unstiffened web must be checked. Reference: EN 1993-1-1 6.2.6(6), EN 1993-1-5 5.1.

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Does the web need a shear buckling check?: worked example sheet in Equation Pad with typeset equations and results.

Example only. This sheet shows one way to set out the check. It is not endorsed by the bodies that publish the design codes and does not reproduce them. Check every clause, value and assumption against your own copy of the current edition of Eurocode 3 and its national annex before you use it, and have the result checked by a competent person. See the disclaimer.

The calculation, line by line

Every line below is typed into Equation Pad exactly as shown; the app typesets it, works out the value with its units and shows checks as TRUE or FALSE. Change any input and everything below it updates.

# Inputs
f_y := 355 MPa
eta := 1.0
epsilon := sqrt(235 MPa/f_y) =

# Plate girder web
h_w := 1200 mm
t_w := 10 mm
h_w/t_w =
h_w/t_w <= 72*epsilon/eta =
# FALSE here: this deep, thin web must be checked for shear buckling (EN 1993-1-5 section 5) or given stiffeners.

# Rolled IPE 300 web
h_w2 := 278.6 mm
t_w2 := 7.1 mm
h_w2/t_w2 <= 72*epsilon/eta =

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