I have written a little essay on how to run structural problems named:
"exploring the world of beams, plates, rados and cables structures in a linear and non linear fashion with Gmsh, Code_Aster and Salome-Meca"
all is the title.
The pdf file is avalaible here http://www.caelinux.org/wiki/images/6/64/Beam-cable-gmsh-aster.pdf
Your comments at suggestions are welcomed at the email given in page 2
archive named "worked_examples" will follow soon
jean pierre aubry