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Soil type enters a code design spectrum by

  • A.altering the damping ratio to be used
  • B.fixing the number of modes to consider
  • C.changing the shape and the corner periods
  • D.multiplying the whole curve by the zone factor

Answer: C

Softer soils shift energy to longer periods, so the plateau extends further and the ordinates alter, which is why codes publish separate curves for rock, medium and soft soil. Zone and importance are separate multipliers.

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