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A structure is tested to \( 1.5 \) times limit load and must hold it for

  • A.3 seconds
  • B.30 seconds
  • C.1 minute
  • D.Indefinitely

Answer: A

The requirement is that ultimate load be sustained for three seconds without failure. Permanent deformation is acceptable at that level; it is at limit load that the structure must return to shape without detrimental permanent set.

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