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A retrofit that stiffens only one side of a building in plan risks

  • A.reducing the total seismic force on the building below the code minimum value
  • B.lengthening the natural period of the building in both principal directions at once
  • C.removing the need for any strengthening on the other side of the building
  • D.creating a torsional irregularity that did not exist before

Answer: D

Moving the centre of stiffness away from the centre of mass produces twist under shaking and overloads the far corners. Retrofit schemes are therefore checked for the irregularity they introduce as well as the one they remove.

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