All “Gravity Only Design” members are designed as per the normal AISC Specification rules for the seismic load combinations.

Additional design rules are required for seismic combinations. These are as per the AISC Seismic Provisions (AISC 341-05) (Ref. 9), (AISC 341-10) (Ref. 10) or (AISC 341-16) (Ref. 11). These additional design rules ONLY apply to members in Seismic Load Resisting Systems. These rules are applied as follows:

• If SDC = A - no additional requirements

• If SDC = D, E or F, apply rules for AISC 341

For each of X and Y directions:

• If SDC = B or C and R <=3 - no additional requirements

• If SDC = B or C and R > 3, apply rules for AISC 341