Discussion
Consider the following statements about the shear centre:
1. A load through it produces bending without twisting.
2. It lies on any axis of symmetry the section possesses.
3. It always coincides with the centroid.
Which of the statements given above is or are correct?
Answer: C
Correct answer: 1 and 2 only
Statements 1 and 2 are correct: the shear centre is by definition the point through which a load causes bending without twist, and symmetry requires it to lie on any axis of symmetry. Statement 3 is false in general - for a channel the shear centre lies outside the material altogether, and only in a doubly symmetric section do the two points coincide.
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