Answer:
When activating the automatic combinations in General Data, the actions, combination expressions, action combinations, and load or result combinations are created automatically. In this case, some default settings have been selected by the program developers, which apply in most cases.
By default, the following design situations with the respective combination expressions are generated:
- ULS: Ultimate limit state for permanent or temporary situation
- SLS: Serviceability limit state for characteristic situation
- SLS: Serviceability limit state for frequent situation
- SLS: Serviceability limit state for quasi-permanent situation
If load cases of the "Accidental" or "Earthquake" type have been defined, they are not considered in the preset combinations. For these load cases, it is necessary to create a new combination expression manually. You can select the appropriate design situation in the list.
Accidental load cases are only used in the "Ultimate Limit State - Accidental" or "Earthquake" expressions.