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Discussion

The three quantities a retrofit can address are

  • A.cost, programme and disruption to the occupants of the building during the works
  • B.mass, cover and the compressive strength of the concrete used in the original work
  • C.the seismic zone, the soil type and the importance of the building being retrofitted
  • D.strength, stiffness and ductility

Answer: D

Correct answer: strength, stiffness and ductility

A building may be deficient in any of the three, and the remedy differs for each: shear walls for strength, bracing for stiffness, jacketing and confinement for ductility. Reducing the demand - by removing mass or isolating the base - is the fourth approach, addressing the other side of the comparison.

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