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The shear flow distribution in the web of an I-section beam under transverse shear is

  • A.Parabolic, peaking at the neutral axis
  • B.Uniform across the web depth
  • C.Zero at the neutral axis
  • D.Linear from top to bottom

Answer: A

The flow accumulates the first moment of area as one integrates down from the flange, which produces a parabolic distribution peaking at the neutral axis. In practice the web is often taken to carry a uniform average flow, an approximation good to a few per cent for a deep section.

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