NBC Example - CAESAR II - Help

CAESAR II Users Guide (2019 Service Pack 1)

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CAESAR II
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CAESAR II Version
11.0 (2019)

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.