The design situations in RFEM control which combination rules are applied when generating the load combinations and result combinations for the limit states of the standard. Manually created combinations can also be assigned to specific limit states (see chapter Bemessungssituationen of the RFEM manual).
The 'Design Situations' table for steel design lists all design situations defined in the model. Here, you can decide whether and how a specific design situation should be considered for steel design checks.
Selecting design combinations for steel design
The 'To Design' checkbox is selected by default. This means that all design situations are checked in the steel design. If no steel design is to be performed for a design situation, clear the checkbox. This design situation is then not considered in the checks. This selection is synchronized with the settings in the 'Load Cases and Combinations' dialog.
By default, all combinations of a design situation activated for design are considered. However, in the table column 'Combinations to Design for Enumeration Method', you can also define specific combinations of the design situation: Click the
button, which becomes available with a click in the cell, and then select the relevant combinations in the dialog.
Assigning design situations
The design situations were formed on the basis of the standard that you specified for the load case classification (see chapter Normen I of the RFEM manual). It is conceivable that the type of the design situation differs from the type for design. As a rule, however, the types are categorized automatically, so that a serviceability combination LC is also assigned to the type 'Serviceability' for design. In the table column 'Design Situation Type', you can check this assignment and, if necessary, correct it.
The checks carried out in the Add-On are based on the design situation type. For example, if no design situation has a serviceability type, no serviceability checks are performed either, but only ultimate limit state checks. For each design situation, only the checks belonging to the design situation type are performed.
You can also activate several design situations of the same type for design, such as two design situations for ultimate limit state checks. The Add-On then performs the ultimate limit state checks for the selected combinations of both design situations.
Using another material for design
The 'Different Materials' option in the Load Cases and Combinations dialog offers the possibility to change materials for the design checks of a design situation. If you check the box, you can define the alternatives in a new tab.
This allows you to use different material parameters for the structural analysis and for the design.