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If imperfection factor α = 0.49, then what is the buckling class?

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in Design of Steel Structures by (962k points)
If imperfection factor α = 0.49, then what is the buckling class?

(a) a

(b) c

(c) b

(d) g

This question was addressed to me in an online quiz.

My doubt is from Design of Compression Members topic in chapter Design of Compression Members of Design of Steel Structures

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The correct answer is (b) c

Explanation: For buckling class c, the value of imperfection factor is 0.49. The imperfection factor 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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