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The most frequently overlooked consequence of adding shear walls in a retrofit is

  • A.the demand placed on the foundations beneath them
  • B.the reduction in the total mass of the building that the new walls bring about
  • C.the lengthening of the natural period of the building in the direction of the walls
  • D.the loss of confinement in the columns of the storey where the walls are added

Answer: A

A wall collects a large share of the storey shear and delivers a large overturning moment to its base, and the existing footings were never designed for it. New pile caps or raft extensions are commonly the largest single item of the work.

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