Why are the Sds, Fa different for the same site class D between ELF and Dynamic load cases ? Please let me know. Thanks!
This is unique to the 2016 code. If you do it using the 2010 code I think they will match. I'm looking into what exactly changed with regard to Fa and Sds in 2016.
Seth: I think I figured out the reason in my ELF load case the site class was selected as Site Class D, Stiff Soil, Default. So per ASCE 7-16 11.4.4, if the site class is selected as D, default then Fa is capped at 1.20. I changed to Site Class, Stiff Soil and I got the Fa to be 1.00.