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The zone factor in the Indian seismic code represents

  • A.the flexibility of the soil beneath the foundation
  • B.the expected level of ground motion in a region
  • C.the importance of the structure being designed
  • D.the ductility available in the chosen structural system

Answer: B

Correct answer: the expected level of ground motion in a region

The zone factor in IS 1893 is the regional seismicity term, corresponding to the maximum considered earthquake for that zone. Soil is handled through the spectrum shape, importance through the importance factor and ductility through the response reduction factor - four separate terms in the design coefficient, each doing one job.

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