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The moat around a base-isolated building exists to

  • A.drain rainwater away from the foundations of the isolated structure
  • B.provide access for the delivery of materials during construction work
  • C.reduce the vertical load carried by the bearings beneath the building
  • D.allow the building to move

Answer: D

Displacements of a few hundred millimetres have to happen freely, so a clear gap is kept all round and bridged with sliding covers. Anything placed in that gap after the building is occupied defeats the isolation entirely.

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