For further information on the use of the Static Seismic Wizard see the example below.
Importance Factor IE = 1.0 for a "Normal" category by Table 4.1.8.5.
The Site Class is "C" for "Very dense soil and soft rock" by Table 1.1.8.4.A:
Sa (0.2) = 0.55, spectral response acceleration value at 0.2 s, as defined in Sentence 4.1.8.4.(1).
According to Table 4.1.8.4.B.,Fa = 1.0:
Sp = Cp Ar Ax / Rp = 1 * 1 * (1 + 2 * 0.5) / 3 = 0.6667
Cp = 1, Ar = 1 and Rp = 3 according to Table 4.1.8.17.
The maximum value of Sp is 4.0 and minimum value of Sp is 0.7, therefore:
Sp = 0.7
aH= 0.3 * Fa Sa (0.2)IE Sp = 0.3 * 1.0 * 0.55 * 1.0 * 0.7 = 0.1155
CAESAR II displays the calculated gravity factor on the Uniform Loads tab.