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Which of the following is the least effective way of improving the seismic performance of a building?

  • A.Providing ductile detailing to the beams and columns
  • B.Reducing the mass carried at the upper floors
  • C.Increasing the thickness of the external plaster
  • D.Adding shear walls in both principal directions

Answer: C

Plaster adds mass without useful strength or stiffness, so it makes matters marginally worse rather than better. The other three each address demand, stiffness or ductility, which are the quantities that actually determine how a building behaves.

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