Question

Which of the following buckling check is applied to stiffeners?

(a) [(V+Vc)/γm0] ≤ Fqd

(b) [(V+Vc)γm0] ≥ Fqd

(c) [(V-Vc)/γm0] ≤ Fqd

(d) [(V-Vc)γm0] ≥ Fqd

I have been asked this question in examination.

The doubt is from Stiffeners in division Gantry Girders, Design of Plate Girders & Industrial Buildings of Design of Steel Structures

Answer 1

Correct choice is (c) [(V-Vc)/γm0] ≤ Fqd

For explanation I would say: Stiffeners not subjected to external loads or moments should be checked for buckling for a force Fd = [(V-Vc)/γm0] ≤ Fqd, where Fqd is design resistance of intermediate stiffeners, V is factored shear force adjacent to the stiffener, Vcr is shear buckling resistance of the web panel designed without using tension field action. This check is required for intermediate stiffeners only when tension field action is utilized in webs.