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An open ground storey in an existing building is a deficiency because

  • A.the storey lengthens the natural period of the building and so reduces the demand
  • B.the columns at that level are always of larger section than those above them
  • C.the drift concentrates in that storey's columns
  • D.the storey carries less vertical load than the storeys above it in the building

Answer: C

The flexible storey must accommodate almost the whole of the building's drift while the storeys above ride as a rigid block. Correcting it means stiffening that level, or designing its columns for the magnified forces it attracts.

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