Re: [Tochnog-users] Tochnog for Geotechgnical Problems

[D M. <D....@ci...>]

 Oscar

> - quad9, reduced integration, large deformations:  the program runs and
> converges but the maximum bearing capacity is only about 400 ('exact' result
> is 771)

 post_line_dof really does not work for -quad9 elements with reduced
integration. Thanks for spotting it! Stresses in nodes of footting are
the same for -minimal and -maximal integration, -post_line_dof over
footing width is significantly different (see cmpfoot_quad9.eps)

> -tria3, full integration,large deformations: program runs but the
> stress-deformation curve does not become horizontal but continues to grow.

 Your mesh is too coarse on the edge of footing. I have extended fine
elements over footing edge (tria3upmin_fine.dat) and results are already
very close to "true" solution (see cmpfoot_mesh.eps). Note unrealistic
results with basic Tochnog!

> - quad9, maximal integration and large deformations: the program gives an
> error message. As you requested, I am including this input file called
> foot2a.dat. The error message says: 'Exiting due to signal SIGSEGV'.

 Sorry for that, you use version of Tochnog, which was on my page before I
have changed it for gcc 3.2.2. That version had a small bug in create.cc.
The new one works.

 Thanks for help!
  David