Stress-Strain Cuver for Steel Fiber Reinforced Concrete

[mattroidena1]

Hello everyone,
I want to model the behavior of Steel Fiber Reinforced Concrete (SFRC) that has more ductility than normal concrete. So that, the descending part of the stress - strain curve of SFRC should go down gradually than the normal one. But I tried all the concrete class available in OpenSees, there is no one could be considerable. So does anyone know how to make a modification for these class in this case? Please help me to do it.
I am really appreciated any feedback for my problem, thank you!

[fmk]

if none exists and you cannot make it using existing materials in series or pararlell with other materials you are ging to have to write some code. take a simple model that is close to what you want, understand it and then modify it. They key word is SIMPLE. Some of the uniaxial materials can be overly complex.

[mattroidena1]

Thank you very much!

[mja441]

Dear mattroidena1,

I too need to model SFRC in opensees. Can u share me the material model u used and any other supporting info ?

I will be very appreciated,

Regards