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The response reduction factor R in a seismic code reflects the

  • A.ductility and overstrength of the structural system
  • B.expected level of ground motion in the region
  • C.importance of the building's function
  • D.flexibility of the underlying soil

Answer: A

A well-detailed ductile frame is assigned a high value and a brittle system a low one, so the same spectrum yields different design forces for different systems. Zone, importance and soil are handled by separate terms.

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