Answer:
The analysis of a rigid column base is performed according to EN 1993‑1‑8 in the RF‑/JOINTS Steel – Column Base add-on module. The standard only provides simple bending in the design format. The design can be performed for pure compression, tension, simple bending, or a combination of either bending and tension, or bending and compression. If you click "Yes" to confirm the message, the add-on module performs all design checks without taking into account the unsupported internal force Mz.