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Capacity design in earthquake engineering means

  • A.choosing where yielding will occur and protecting everything else against it
  • B.designing every member for the largest force it could conceivably ever carry
  • C.computing the capacity of the structure and ignoring the demand upon it
  • D.sizing members from the gravity load case and checking nothing further

Answer: A

The designer nominates ductile locations, typically beam ends, proportions them for the code force, and then designs columns, joints and foundations for the force those locations can actually deliver when they yield. That hierarchy is what stops a brittle element from failing first and turning a ductile mechanism into a collapse.

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