For design according to EN 1992-1-1, the definition of 'concrete durabilities' is necessary so that the program can, for example, apply the concrete cover automatically. This type of concrete design is therefore only available if you have specified the standard EN 1992 for the design in the model base data. This type does not exist for all other design standards. In that case, you have to define the concrete covers manually for the individual structural components.
Exposure Classes
In the Exposure Classes tab, exposure classes for the reinforcement and the concrete are offered. You can control the selection using the check boxes and lists.
If you select the 'No risk of corrosion or attack' option for the 'Exposure class for reinforcement', you define exposure class X0.
Exposure class X0 is relevant for foundations without reinforcement and without frost as well as for interior structural components without reinforcement. However, in the current development status, unreinforced foundations cannot be designed. Therefore, this option plays a subordinate role. If you nevertheless use exposure class X0, the program assumes a minimum concrete cover of 20 mm for the design.
In the 'Exposure Classes' tab, you can also make a multiple selection. As shown in the infographic on the right side of the dialog, the exposure class that is governing for the concrete cover based on this selection is then set.
The governing exposure class is shown in black text in the infographic. The exposure classes that play a subordinate role in this combination are displayed in blue. This allows you to quickly check the combination options of exposure classes for different structural components.
Name
The program creates a name from the selected exposure classes that describes the type of concrete durability. Using the button
next to this generated designation, you can edit the entry and assign a user-defined name. This is especially useful for models with many different types, as it improves clarity and facilitates the assignment of the types to the individual structural components.
Assigned To
This section lists the numbers of the members and surfaces to which the selected type of concrete durability has been assigned. Using the button
, you can add or deactivate further objects.
Concrete Cover Options
The Concrete Cover Options tab allows you to specifically adjust the concrete covers resulting from the exposure classes.
Structural Class
Using the options in this section, you can increase or reduce the structural class as described in EN 1992-1-1, Table 4.3N, provided that special conditions apply regarding the service life or the concrete properties. Alternatively, select the 'User-defined structural class' in the list.
Reduction of Concrete Cover for Durability
The check boxes in this section allow you to reduce the concrete cover for reinforcement made of stainless steel or with special protective measures.
Allowance for Deviation
The allowance for deviation Δcdev describes the permissible negative deviation during construction in order to take unintended deviations into account. In this section, you can apply the recommended default value 'For production on uneven surfaces' in order to increase the nominal dimension. Alternatively, you can define the allowance for deviation user-defined.