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You choose a site class from A to F NBC Table 4.1.8.4.-A from soils analysis. The input includes the Ground Profile name from Table 4.1.8.4.-A, to help you identify your Site Class.
Site Classes are used to determine site co-efficients F(T) in Tables 4.1.8.4.-B to -F for periods T from 0.2 to 5.0.