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.

Note: In the event of data that is imported from a STAAD.Pro model or an ISM file, these forces and moments will have a sign that is opposite to the reactions in the STAAD.Pro model or ISM file. For example, if the reaction in the STAAD.Pro model is FY = +47.5 kNs, then, the load on the foundation will be -47.5 kNs.

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.