Answer:
In the first instance, the determination of the sliding resistance in RF‑/FOUNDATION Pro depends on whether you apply the "drained/consolidated" or "undrained/unconsolidated" soil conditions.
You can find this setting in Window "1.1 General Data" of the add-on module. See Image 01.
Depending on the selected soil conditions, different formulas are applied to determine the sliding resistance.
The formulas can be found in the theory section of the RF‑/FOUNDATION Pro manual.
Chapter 3.1.3 Geotechnical Design According to EN 1997‑1, page 40 ff.
To open the manual, simply click the [F1] key when starting the module.
