The General tab of the Definition of calculation parameters dialog box for NEN Code: 
Concrete parameters are defined 3 ways.
- When the As in a structure model option is selected, needed material parameters are assigned from the data used for static calculations of structures. 
 
- Giving a concrete grade from a provided list. 
 
- Defining the fck value of concrete resistance. 
 
The following parameters can be defined. 
- Cracking value. 
 
- Redistribution coefficient. 
 
- Coefficient of concrete creep. 
 
At the bottom of the dialog, Reinforcement control (EC2 4.4.2.3) checks reinforcement for cracking.