Question

What is overall flexural buckling?

(a) failure occurs by excessive deflection in plane of weaker principal axis

(b) failure occurs by excessive deflection in plane of stronger principal axis

(c) failure occurs by twisting of member

(d) failure caused by seismic load

The question was posed to me by my school teacher while I was bunking the class.

This interesting question is from Behaviour and Ultimate Strength of Plates and Possible Failure Modes topic in chapter Plastic and Local Buckling Behaviour of Steel of Design of Steel Structures

Answer 1

The correct answer is (a) failure occurs by excessive deflection in plane of weaker principal axis

The explanation: Overall flexural buckling is failure which occurs by excessive deflection caused by bending or flexure, about axis corresponding to weaker principal axis(minor) – one with smallest radius of gyration, largest slenderness ratio.