Site response analysis have to be performed in accordance with Section 21.1 for structures on Site Class F sites, unless exempted in accordance with Section 20.3.1.

A site response analysis in accordance with Section 21.1 and/or a ground motion hazard analysis in accordance with Section 21.2 could be performed to determine ground motions for any structure.

Due to the need for site-specific analysis for site class F, the reduced design spectrum needs to be imported as a .txt file.