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Which of the following condition causes lateral instabilities?

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Which of the following condition causes lateral instabilities?

(a) section possesses different stiffness in two principal planes

(b) section possesses same stiffness in two principal planes

(c) applied loading does not induce bending in stiffer plane

(d) applied loading induce twisting in stiffer plane

I got this question in unit test.

I would like to ask this question from Lateral Stability of Beams in chapter Design of Beams of Design of Steel Structures

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The correct answer is (a) section possesses different stiffness in two principal planes

Explanation: Lateral instabilities occurs only if following conditions are satisfied : (i) section possesses different stiffness in two principal planes, (ii) applied loading induces bending in stiffer plane (about major axis).

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