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A building deficient in ductility but adequate in strength and stiffness is best retrofitted by

  • A.adding strength to the beams so that they exceed the capacity of the columns
  • B.increasing the mass of the building so that its natural period is lengthened
  • C.confining the critical members
  • D.adding new shear walls in both principal directions throughout the building height

Answer: C

Steel jackets or fibre wraps at the ends of columns raise the rotation capacity without adding appreciable strength or stiffness, so the rest of the design is undisturbed. It is the cheapest of the structural measures where it is the right one to use.

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