You have to have a look at this topic: https://forums.cervenka.cz/viewtopic.php?id=1909

If you check the tcl scripts I mentioned in that discussion, you will find that Gf is calculated differently if MC2010 or Eurocode is selected. I would say that Gf "to Eurocode" is quite low and is probably conservative. We'd better wait until official support explains why Gf is calculated by different formulas (this is what I wondered as well).

In this post, I'm interesting for understand some questions regarding to the equations used in the parameters of constitutive model for Concrete.

In my model,  I have the cubic strength and i want understand how atena calculated their parameters (default).  I found in the Theory_Atena (section 2.1.13) any equations and  tryed calculate by hand, but some answers aren't the same values that Atena.
E.g I found that the case of Energy Fracture (Gf) is as 0.000025ft'ef but if i do using the equation of Model Code 2010 Gf=73fcm^0.18 i have the same answers. I don't know if i'm wrong.
Other case is about eps_cp in the theory is fc/E but i don't have the same value of atena, too.

Could help me, about how determine each parameter or if I'm considering something wrong?.

Best regards!
Ingrid