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In an open thin-walled section under a transverse shear force, the shear flow

  • A.Cannot be determined without a redundancy
  • B.Is zero at a free edge and builds up
  • C.Is constant everywhere around the section
  • D.Is greatest at the free edges

Answer: B

A free edge carries no complementary shear, so the flow starts at zero there and accumulates as the first moment of area is swept up. The problem is statically determinate, which is what distinguishes it from the closed-section case.

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