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A building is designed with a soft ground storey for parking. IS 1893 requires that

  • A.no special measure be taken
  • B.the upper storeys be designed for magnified forces instead
  • C.the building be relocated to a lower seismic zone
  • D.the ground storey columns be designed for magnified forces

Answer: D

Because the drift concentrates in the flexible storey, the code multiplies the forces in its columns and beams by a factor determined from the analysis, or requires the storey to be stiffened with braces or walls. Ignoring the irregularity has repeatedly produced collapses of exactly that storey.

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