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In the new STKO version 2.0.0 (that will be released soon in January) you will have a Python scripting environment that will allow you to extract data from the Output DataBase, and post-process it. For example, you can extract the stress-strain curve for material and numerically compute the bounded ...

I did not understand your question.
Are you saying that if you use the element's body force it shows pore pressure, whereas if you use equivalent nodal forces (VolumeForce in STKO) it does not?

I can see the water pore pressure. If you refer to the face that you see it only on the corner (8) nodes of the quadratic 20 node element, it's because only the corner nodes have pressure DOFs. This comes from the theory of mixed finite element . Pressure should be interpolated with 1 order less tha...

Here is the fixed file: pile_YW.zip You correctly understood the concept of the auxiliary surface. In fact, the model was correct. There was only one tiny mistake: Make sure the auxiliary surface has the (possibly) same mesh as the source surface. In your case, I had to impose an EdgeSeed to the bot...

But I have seen, in many papers, people are using steel02. So how come they model the damage using Steel 02.

They can't. Probably they were using a modified Menegotto-Pinto (I think it's called Reinforcing Steel) that has some similar cyclic damage features

Your steel model does not have damage.
You need to use a steel model that can represent cyclic damage
Here is an example of what I obtain:
Now you can play with the damage parameters to better fit your experimental curve

Could you please post a screenshot of the whole error messagebox? including the complete traceback

Rather than pinching, it looks like your experimental data is showing cyclic degradation.
You should play with the concrete and steel materials if you are using the fiber section.
Send your file here, I will try to have a look

Can you send us a file (the SCD preprocessor file) so that we can test it?

When you do not assign any element property to the auxiliary face, STKO will not generate any OpenSees Element in the TCL files, but it will only write the nodes of the auxiliary face. And this is exactly what you want: these "floating" nodes will have 3 DOFs (because they don't have a UP element) s...