The Design Situations of 'Concrete Foundations' category lists all design situations that have been defined for the model. For concrete foundations, two standards are relevant for the assignment of the design situation types:
- EN 1992 for the concrete design
- EN 1997 for geotechnical analyses
The design situations are described in Chapter Design Situations of the RFEM manual.
Selecting design situations for concrete foundations
By default, the "To Design" check box is activated for all design situations. This allows you to analyze all design situations in the concrete foundation 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.
Self-Weights for Concrete Foundations
In the 'Load Cases' tab of the 'Load Cases and Combinations' dialog box, you can define by load case whether and how the self-weight should be considered for concrete foundations. To do this, select the Dead weights for concrete foundations option in the 'Dead Weight' section. The Concrete Foundations tab is added.
In the 'Concrete Foundations' tab, you can specify whether the self-weight of the foundation structure, the earth covering, and the ground water should be considered.
If earth covering and groundwater are activated and their properties have been defined in the Soil Properties dialog box, the corresponding loads are created automatically. If they are deactivated, you may have to manually define them as additional foundation loads. You can find an explanation of this in Chapters Earth Covering and Groundwater.
Tip
To also combine the self-weight in the ultimate limit state with the partial safety factor 1.0, activate the combination wizard, select the Favorable permanent actions check box in the 'Options II' section.
Design situation for the design of highly eccentric loading in the core
For foundations on non-cohesive and cohesive soils, no gaping joint may arise in the foundation base due to characteristic permanent actions (see Chapter Foundation Rotation). For having the appropriate load combinations available, you need to create a design situation combining the characteristic permanent actions. You can create a new characteristic design situation in the Design Situations tab.
In the next step, it is necessary to copy the characteristic load combinations with exclusively permanent loads and assign them to the new design situation: