The B5+ program can be used to calculate reinforced concrete columns and walls exposed to uniaxial or biaxial loading. In addition to simple structural systems such as hinged or cantilever columns, the user can also freely define structural systems of multiple column segments. As a standard, the calculation is non-linear and uses the actual stress-strain ratio. A fire safety design is available via an add-on.
Manual: https://www.frilo.eu/files/_inhalte/downloads/en/pdf_doku/B5_eng.pdf