Currently SACS does not have an option to consider warping for torsional resistance. This yields very high torsional rotation/deflection values .
See post below for more detail.
https://communities.bentley.com/products/offshore/f/maxsurf-moses-sacs-forum/248943/torsional-rigidity---sacs-and-staad-vs-fea-ansys?ReplySortBy=CreatedDate&ReplySortOrder=Ascending