In California seismic design, a building site with Vs30 = 250 m/s and located in an area with SMS = 1.8g would be classified as which Site Class according to CBC Chapter 16?
Correct Answer
C) Site Class E
CBC Section 1613.2.2 classifies sites with Vs30 between 180-360 m/s as Site Class D under normal conditions. However, when SMS ≥ 1.25g and Vs30 ≤ 360 m/s, the site must be classified as Site Class E per CBC Table 1613.2.2, requiring more stringent seismic design requirements.
Why This Is the Correct Answer
CBC Section 1613.2.2 classifies sites with Vs30 between 180-360 m/s as Site Class D under normal conditions. However, when SMS ≥ 1.25g and Vs30 ≤ 360 m/s, the site must be classified as Site Class E per CBC Table 1613.2.2, requiring more stringent seismic design requirements.
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