GGU-UNDERPIN: Slenderness
DIN 4093:2012-08 stipulates that the slenderness λ ≤ 15, if no buckling safety analysis is performed. EN 1993-1-1:2010-12 states that buckling safety analysis may be dispensed with if the following condition is adhered to:
NEd/Ncr ≤ 0.10
NEd = design value of the normal force
Ncr = ideal bifurcation load for the governing buckling case
Ncr = E·I · π²/sk²
E = Young’s modulus of the body
I = moment of inertia
sk = buckling length
If the conditions:
a) slenderness λ ≤ 15 and
b) NEd/Ncr ≤ 0,10
are not adhered to, an analysis of the unreinforced concrete compliant with DIN 1045-1 may be performed instead. The relationships in DIN 1045-1 include a buckling safety analysis.