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Base isolation protects a building by

  • A.decoupling it from the ground so that less motion is transmitted
  • B.increasing the strength of every member in the superstructure until it can resist the demand
  • C.adding mass at the base to hold the building down
  • D.stiffening the building so that it moves with the ground

Answer: A

A flexible layer between the foundation and the structure lets the ground move while the building above stays comparatively still. The approach reduces the demand rather than increasing the capacity, which is what distinguishes it from conventional strengthening.

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