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If Mcr > My of a beam section, then

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If Mcr > My of a beam section, then

(a) beam does not buckle

(b) beam buckles fully elastically

(c) beam buckles completely plastically

(d) some amount of plasticity is experienced

I have been asked this question in homework.

Asked question is from Behaviour of Real Beam in division Design of Beams of Design of Steel Structures

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Correct option is (d) some amount of plasticity is experienced

To elaborate: When critical moment of a section Mcr  is greater than My , some amount of plasticity is experienced at the outer edges before buckling is initiated.

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