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Reducing the size of large openings in a masonry wall as a retrofit measure

  • A.restores the length of solid wall available to resist shear
  • B.increases the mass of the wall and therefore the force it attracts from the shaking
  • C.has no effect on the in-plane strength of the wall
  • D.removes the need for any bands or corner reinforcement elsewhere in the building

Answer: A

Piers between wide openings are often too slender to carry the storey shear, and infilling part of an opening lengthens them. The new masonry has to be properly toothed and bonded into the old, or it contributes nothing.

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