The 'design horizontal seismic coefficient' Ah in IS 1893 (Part 1) is given by:
Choose the correct answer
Ah = 0.1 for all zones
Ah = (Z/2) × (I/R) × (Sa/g) — depends on zone, importance, ductility, and period
Ah = W (building weight)
Ah = I/R only
Correct Answer
B. Ah = (Z/2) × (I/R) × (Sa/g) — depends on zone, importance, ductility, and period
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IS 1893 (2016): Ah = (Z/2) × (I/R) × (Sa/g). Z = zone factor (0.10–0.36 for zones II–V); I = importance factor (1.0–1.5); R = response reduction factor (depends on structural system, e.g., SMRF R=5); Sa/g = design acceleration spectrum coefficient (depends on time period T and site type). Design base shear VB = Ah × W.
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