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A retrofit that stiffens only the upper storeys of a building risks

  • A.creating a soft storey lower down
  • B.reducing the seismic demand on the upper storeys below any useful level at all
  • C.increasing the natural period of the whole building to an unacceptable value
  • D.eliminating the torsional response of the building in both directions

Answer: A

Correct answer: creating a soft storey lower down

Stiffening part of a building concentrates the deformation in whatever is left unstiffened, so the storey below the strengthened region takes the drift the storeys above no longer do. A retrofit must therefore be checked over the whole height - strengthening a part can make the whole worse.

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