Discussion
Assertion (A): Open sections suffer larger warping-restraint stresses than closed ones.
Reason (R): Open sections have a smaller cross-sectional area than closed ones.
Select the correct answer from the options below.
Answer: D
The assertion is true but the reason is false and irrelevant. Area has nothing to do with it: the effect is large because an open section wants to warp a great deal, so restraining it forces large axial strains. A closed section warps very little in the first place.
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