Question

Euler buckling stress fcc is given by

(a) (π^2E)/(KL/r)^2

(b) (π^2E KL/r)^2

(c) (π^2E)/(KL/r)

(d) (π^2E)/(KLr)^2

I got this question during an interview.

The origin of the question is Design of Compression Members in chapter Design of Compression Members of Design of Steel Structures

Answer 1

Right answer is (a) (π^2E)/(KL/r)^2

To explain I would say: Euler buckling stress fcc is given by fcc = (π^2E)/(KL/r)^2, where E is modulus of elasticity of material and KL/r is effective slenderness ratio i.e. ratio of effective length, KL to appropriate radius of gyration, r.