Material properties in fiber modelling

[Fahimeh]

I have noticed that the properties assigned to steel fiber elements in the examples are all the same. For steel material, Hardening Material with post elastic ratio of 1/30 has been used.
I wonder if it is based on previous research or just an assumption?
Thanks

[fmk]

if you are referring to Silvias examples, they are not based on research results just based on knowledge of someone who got he Ph.D studying behaviour of concrete structures.