Question

The second moment of area of transverse web stiffeners not subjected to external loads or moments is given by

(a) Is ≤ 0.75dtw^2

(b) Is ≥ 0.75dtw^2

(c) Is ≤ 1.5dtw^2

(d) Is ≥ 12.5dtw

The question was posed to me by my college professor while I was bunking the class.

This key question is from Stiffeners topic in portion Gantry Girders, Design of Plate Girders & Industrial Buildings of Design of Steel Structures

Answer 1

Right option is (b) Is ≥ 0.75dtw^2

To explain: Transverse stiffeners not subjected to external loads or moments should have second moment of area Is about centreline of the web, if stiffeners are on both sides of the web and about face of the web, if stiffener is on only one side of the web such that Is ≥ 0.75dtw^2 for c/d ≥ √2 and Is ≥ 1.5dtw^2/c^2 for c/d < √2.