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The shear flow in the web of a deep beam is often taken as uniform because

  • A.The web carries no shear at all
  • B.The flanges carry all the shear
  • C.The peak exceeds the average only slightly
  • D.The true distribution is exactly uniform

Answer: C

For a deep section with most of the area in the flanges, the parabolic variation across the web is slight, so the average flow is an accurate and much quicker working value. For a shallow section the approximation is poorer and the full distribution should be used.

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