Axis System
STAAD Foundation Advanced uses the following axis system for recognizing the directions of loads and moments.
X and Z are the horizontal axes and Y is the vertical axis.
FX, FY, and FZ are the forces acting along the global X, Y, and Z axes respectively, transferred into the foundation from the supports for the columns.
MX, MY, and MZ are the moments acting along the global X, Y, and Z axes respectively, transferred into the foundation from the supports for the columns.
Thus, the sign convention for these terms is the same as that for JOINT LOADs in STAAD.Pro.
For data that brought from a superstructure analysis model which uses the "Z UP" system, the data is transformed into STAAD Foundation Advanced’s axis system before the data is displayed in STAAD Foundation Advanced.