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An engineer computes a margin of safety of minus 0.1 for a member. This means the member

  • A.Is exactly at its allowable stress
  • B.Is over-designed by ten per cent
  • C.Fails at the applied load and must be redesigned
  • D.Has ten per cent of strength in reserve

Answer: C

A margin of safety is the allowable over the applied, less one, so a negative value means the applied load exceeds the allowable and the member is inadequate. Zero means exactly at the allowable, and positive values indicate reserve.

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