The design situations of the RFEM/RSTAB model control which combination rules are applied when generating the load and result combinations for the code limit states. Manually created combinations can also be assigned to specific limit states (see chapter Bemessungssituationen of the RFEM manual).
The 'Design Situations' table for timber design lists all design situations defined in the model. Here, you can decide whether and how a specific design situation should be taken into account for timber design checks.
Select design combinations for timber design
The 'To Be Designed' check box is activated by default. This means that all design situations are checked in timber design. If no timber design is to be performed for a design situation, deactivate the check box. This design situation is then not taken into account in the design checks. This selection is synchronized with the settings in the 'Load Cases and Combinations' dialog box.
By default, all combinations of a design situation activated for design are taken into account. In the table column 'Combinations to Be Designed for Enumeration Method', however, you can also define specific combinations of the design situation: Click the
button, which becomes available by clicking in the cell, and then select the relevant combinations in the dialog box.
Assign design situations
The design situations were formed based on the standard you specified for the load case classification (see chapter Normen I of the RFEM manual). It is possible that the type of design situation differs from the type for design. As a rule, however, the types are categorized automatically, so that a serviceability limit state combination-CO is also assigned to the 'Serviceability' type for design. In the table column 'Design Situation Type', you can check this assignment and correct it if necessary.
The checks carried out in the Add-On are based on the design situation type. If, for example, not a single design situation has a serviceability type, then 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 multiple 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.
Use different material for design
The 'Different Materials' option in the Load Cases and Combinations dialog box offers the possibility to modify materials for the checks of a design situation. If you tick the check 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.