The "Design Situations" table of the "Concrete Design" category lists all design situations that have been defined for the model. Here, you can decide whether and in what way a certain design situation should be taken into account for the concrete design checks. Further information about the design situations can be found in Chapter Design Situations of the RFEM manual.
Selecting Design Situations for Concrete Design
By default, the "To Design" check box is activated for all design situations. In this way, all design situations are analyzed for the reinforced concrete design checks. If you deactivate the check box of a design situation, the corresponding design situation is deactivated for the concrete design and no design checks are performed for this design situation.
The settings in the table are synchronized with the specifications for the design situations in the "Load Cases and Combinations" dialog box.
With the default setting, all combinations of a design situation activated for the design are taken into account. If you only want to use certain combinations for the design, click in a text box of the "Combinations to Design for Enumeration Method" check box and then the
button. A dialog box appears where you can exclude the individual combinations from the design.
Assigning Design Situation Types
The design situations were created on the basis of the selected standard for the load case classification. Therefore, you still have to enter the type of the standard that you have defined for the concrete design – both standards can differ from each other. In general, this assignment is carried out automatically, so a serviceability limit state combination from the load case combination is also assigned to the "serviceability" design type. However, you should check these specifications and correct them, if necessary.
The design checks performed in the add-on are based on a design situation type. For example, if there is no design situation for the serviceability limit state type (SLS), no serviceability limit state design is performed. For a design situation of the ultimate limit state type (ULS), only ultimate limit state design checks are performed. Different design situation types are possible, depending on the standard.
You can also activate several design situations of the same type for the design, such as two design situations for the ultimate limit state design checks. Then, the program performs the ultimate limit state design for the selected combinations of both design situations. In this way, it is also possible to create the design situation for the ultimate limit state design checks twice, and to have the resulting load combinations calculated once according to the linear static analysis and once according to the second-order analysis, including imperfections.