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For a building taller than 15 m in Zones III, IV and V, the minimum grade of concrete is

  • A.M20 as for shorter buildings in the same zones
  • B.M15 provided ductile detailing is otherwise complete
  • C.M40 in every case, irrespective of the analysis
  • D.M25

Answer: D

Higher axial stress in the lower columns and greater confinement demand together justify the stronger concrete. The step at fifteen metres is a simple proxy for the number of storeys and the load they accumulate, and it applies across all three of the higher zones.

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