For the ultimate and the serviceability limit state design checks, permanent and variable actions are combined in different design situations.
General
The standard describes how the individual load cases should be combined for the respective design situations and which partial safety factors and combination factors should be applied.
The Eurocode distinguishes between the following design situations:
- Permanent and transient design situation (basic combination) (ULS)
- Accidental design situation (ULS)
- Seismic design situation (ULS)
- Rare design situation (SLS)
- Frequent design situation (SLS)
- Quasi-permanent design situation (SLS)
Usage in Program
In RFEM or RSTAB, one design situation in the ULS (permanent and temporary) and three design situations in the SLS are already preset. In the list of the "Design situation type" section, you can select further situations.
The overview lists all load combinations with partial safety factors and combination coefficients that belong to a design situation. Thus, the design situation corresponds to an envelope that covers the most unfavorable combination of all contained load combinations.
