Assign Random Variable to Reinforced Steel

[luiscelorrio]

Hello, I have a question about assigning random variables to material properties of layer in a fiber section.
How I can consider the material properties of the reinforced Steel bars in a RC section as random variables? I am working to compute structural reliability of a RC frame. I have defined RC section as a fiber section.
Reinforced steel are defined with:
# bottom layer reinforcement
layer straight $IDSteel $numBarsColExt $barAreaColExt -$coreY $coreZ -$coreY -$coreZ;
# top layer reinforcement
layer straight $IDSteel $numBarsColExt $barAreaColExt $coreY $coreZ $coreY -$coreZ;

I have considered the material Steel02 for the reinforced bars.
When I assign random variables to material properties of reinforced steel I use:

addToParameter $tagECE element $e section $ColExtSecTag material $IDSteel E

However it doesn’t work and I obtain this error:
Parameters addComponent 121 -- no objects were able to identify parameter section 2 material 3 E

How can solve it?
Thanks in advance
Luis

[luiscelorrio]

Hello, all
I think that Steel02 material is not valid, as ii is implemented for structural reliability analysis.
Using uniaxialMaterial Hardening the error no objects were able to identify parameter
disappears, however convergence problems appear.

Thanks
Luis