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Retrofitting an existing building with base isolation requires

  • A.no work at the foundation
  • B.the removal of all the internal partitions and finishes throughout the building
  • C.cutting the columns and installing bearings beneath them
  • D.the demolition and complete rebuilding of the entire superstructure above ground level

Answer: C

The load is transferred temporarily, the columns are cut in sequence and the bearings are inserted, which is demanding but well-established work. A moat and flexible services then have to be created around the completed plane.

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