Discussion
In the Indian code the spectral acceleration coefficient is denoted
Answer: D
Correct answer: Sa/g
In IS 1893 the design horizontal seismic coefficient is \[ A_h = \frac{Z}{2}\cdot\frac{I}{R}\cdot\frac{S_a}{g}, \] where \( S_a/g \) is the spectral acceleration coefficient read from the spectrum for the structure’s period and the site soil. \( Z \), \( I \) and \( R \) are the separate zone, importance and response reduction factors, each accounting for something different.
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