Concrete04 with residual strength?

[vsaggelidakis]

Hello to everyone

I am using Concrete04 to describe the behaviour of Confined Concrete using Mander's model (1988).
After the ultimate strain, Concrete04 drops stresses to zero. I am thinking of Combining Concrete04
with another material using the "Parallel Material", to give it residual strength, just like Concrete01,
in order to get more stable results. So far, I haven't found something that works, so I appeal to your
ideas (and imagination of course!) for a way to do this.

Thank you for all the support so far!
VA

[emjac]

Hi. What exactly doesn't work? If all you want is residual strength, why not try using it in parallel with something like the Elasto-Plastic Gap material : http://opensees.berkeley.edu/wiki/index ... p_Material

Example : Say you want residual strength of 4 at a strain of 0.05
set E -10000; # or something else large and negative
set Fy -4.0;
set gap = -0.05;
uniaxialMaterial Concrete04 $matTag1 $fc $ec $ecu $Ec
uniaxialMaterial ElasticPPGap $matTag2 $E $Fy $gap
uniaxial Parallel $matTagParallel $matTag1 $matTag2

You could also check out the Hyperbolic Gap Material : http://opensees.berkeley.edu/wiki/index ... p_Material