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Which one of the following is NOT a reason to choose base isolation?

  • A.To keep a hospital or emergency facility operational after an earthquake
  • B.To avoid altering the visible fabric of a historic building being strengthened
  • C.To reduce the mass of the superstructure
  • D.To protect sensitive equipment housed within the building from acceleration

Answer: C

Correct answer: To reduce the mass of the superstructure

Isolation changes nothing about the mass - the same building stands on the bearings. The three genuine reasons are all here: keeping a critical facility functional rather than merely standing, strengthening a historic building without touching its visible fabric, and protecting acceleration-sensitive contents, which conventional ductile design does nothing for because it accepts damage as the price of survival.

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