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Concrete cover in a member subjected to cyclic loading

  • A.spalls away once the core reaches large strains
  • B.provides the confinement on which the core depends
  • C.increases in strength as the loading continues
  • D.carries most of the compression at large deformation

Answer: A

Being outside the hoops, the cover is unconfined and is lost early in the response, which is why confinement calculations count only the core. It still matters for durability and for bond, so it is not on that account reduced.

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