Andrew Liew

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Preliminary attempts for tets comes across the *Unrecognized element* issue.

Quad element **ShellNLDKGQ** works fine, but both **ShellNLDKGT** and **ShellDKGT** give an "Unrecognized element" error on 2.5.0 Windows version. Both are coded but commented. **tri31** works but is a simple...

- Torsion constant J for TrapezoidalSection. - Ixy for AngleSection.

Done for `CF` and `RF` in `plot_concentrated_forces()` and `plot_reaction_forces`.

Linear axial springs for OpenSees and Abaqus implemented and agree.