There is currently no way, other than directly adding rigid body members with the necessary releases, to simulate an an axial angle or tee member (brace) under eccentric axial load. This causes a high amount of manual calculations to determine the true utilization of these cross-sections, as it will experience the axial load and an induced eccentric moment due to connecting these sections to one of their flanges and away from the section's elastic centroid.

Can a new specification be assigned (say "Eccentric Axial Specification", with options of either Mz (geometric) for tees/angles or My (geometric) for angles only, with a field to add in the connection thickness) to allow one of these geometric axes get a P*(e + eccentricity to connection material's elastic centroid) load applied in the load matrix and subsequently designed?

If too difficult above, can a design parameter be added in the code check to add P*e to the "required" moment demand (applied in the geometric axis, and converted to principle-axis moments)? User would specify ez (geometric) or ey (geometric) to be put under consideration (= e + eccentricity to connection material's elastic centroid).

Either of these options would allow eccentric tees and angles be designed within STAAD without manual calculation. The first would be best, but I understand is more complex. Second option is a great alternative.