Discussion
Assertion (A): A doubly symmetric box has its shear centre at the centroid.
Reason (R): Each axis of symmetry constrains the shear centre to lie on it.
Select the correct answer from the options below.
Answer: D
Both are true and the second explains the first. Two axes of symmetry fix both coordinates at their intersection. The consequence is that bending and torsion decouple naturally in such a box, which is a considerable analytical convenience.
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