Discussion
Consider the following statements about a boom-idealised section under shear:
1. The shear flow is constant along each panel between booms.
2. The flow steps at each boom in proportion to its first moment of area.
3. A boom on the neutral axis produces the largest step.
Which of the statements given above is or are correct?
Answer: C
Correct answer: 1 and 2 only
Statements 1 and 2 are the idealisation: the booms carry the direct stress and the panels between them carry a constant shear flow, which steps at each boom by \( VBy/I \). Statement 3 inverts the consequence - a boom on the neutral axis has zero first moment and produces no step at all, while the largest steps come from the booms furthest from the axis.
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