Answer:
In the serviceability limit state design 1b), the deformation wfin is calculated from the deformation components wcreep and winst. The creep deformation wcreep includes the deformation coefficient kdef. This depends on the material used and on the service class.
The deformation coefficient kdef is preset with the value of 0.6. It does not change automatically with regard to the respective service class. If it is necessary to use a different kdef value for the serviceability limit state design, you can adjust the settings of the National Annex accordingly. Pay attention to which structural component corresponds to the worst (highest) service class.
