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Imperfection factor for welded section is

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in Design of Steel Structures by (962k points)
Imperfection factor for welded section is

(a) 4.9

(b) 0.21

(c) 2.1

(d) 0.49

I had been asked this question in an interview.

This key question is from Design Strength of Laterally Unsupported Beams in portion Design of Beams of Design of Steel Structures

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Right answer is (d) 0.49

The best explanation: Imperfection factor for welded section is 0.49. The imperfection factor depends on the buckling curve and takes into account all the relevant defects in real structure when considering buckling, geometric imperfections, eccentricity of applied loads and residual stresses.

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