Answer:
RF‑CONCRETE Columns designs a provided reinforcement to perform a stability analysis using the method with nominal curvature.
However, the fire resistance design may require a higher basic reinforcement. For this, you can activate the "User-defined minimum and maximum longitudinal reinforcement" in the "DIN EN 1992‑1‑1" tab of Window 1.4 Reinforcement. Then, you can specify an increased basic reinforcement by clicking the [Edit] button.
