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You have E on the order of 10^7 and Iz on the order of 10^20. You probably have numerical issues. Use realistic values for all element properties.

It appears, perhaps, that there is no load applied to your model? It's pretty hard to tell from the limited information you've provided. What if you use a different convergence test, e.g., NormUnbalance, do you get the same behavior?

OK, it's there now.

https://github.com/OpenSees/OpenSees/pull/348

Is this the one?

https://opensees.berkeley.edu/wiki/inde ... %28Beta%29

If you are going through this type of workflow, you should consider using OpenSeesPy.

No, there's no way to add weak springs automatically. You probably have a missing element leading to a local rigid body mechanism. Have you tried plotting your model using the rendering functions in OpenSeesPy?

https://openseespydoc.readthedocs.io/en ... tcmds.html

They are not supported for DDM computations of the gradient, but they should work with finite differences.

Those are some very specific examples. I recommend you make a new post in the general OpenSees forums to see if anyone has Tcl examples to share, then do your best to convert those to Python.

The quotes are a bit of a problem with recorders because they were designed for Tcl where everything is a string and the internal implementation of setResponse reflects this. With the conversion of commands to Python there's a problem if you don't pass everything in as strings, i.e., surrounded by '...

You can try adding ops.wipe() at the end of your analysis. This will flush all the recorders and force them to write and close their files.

You need to set 3 degrees of freedom per node (ndf=3) for space truss analysis. The default is ndf=6 for ndm=3 models, so there are three rotational DOFs at each node that assembly zero stiffness, and thus the errors with the equation solver.

model('basic', '-ndm', 3,'-ndf', 3)

Let's see

Can you run the same simple analyses for a 2D model and report back here if the same behaviors are observed?

This line should not cause problem since "TclPFEMCommands.o" was in the SRC/Makefile. We just move it to the modelbulder/tcl/Makefile. Based on the error messages, it's missing triangle and tetgen libraries in the Makefile.def. Based on the linking errors, add the following in Makefile.def: TRIANGLE...

I'm not really sure what you're asking. Can you describe in more detail?