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True or false: repairing cracks in a building restores its seismic capacity.

  • A.False, since crack repair actually reduces the capacity of the member being repaired
  • B.False, since repair restores integrity but does not add strength or ductility
  • C.True, since a repaired crack returns the member to its original undamaged condition
  • D.True, provided the repair is carried out with epoxy resin rather than cement grout

Answer: B

Injection restores continuity and keeps water away from the reinforcement, which is worth doing, but a member deficient in steel or confinement remains deficient afterwards. Repair and strengthening are different operations.

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