there is a bit of fluff in what i have given you and it needs to be cleaned out. NEXT TIME.
As to the organisation: for every class there will eventually be 2 files, a class.h, and a class.cc. all files are in the following subdirectories:
doc: contains some files concerning documentation, model.tex a latex file and model.ps the postscript (every class does not yet have an upto date class file .. prof. fenves is deciding on the format the documentation will have .. the .ps file is around 200 pages if you want to look at it and give your own comments)
contains the classes for the domain.
Classes that represent the materials abstraction.
Classes used to build the finite element model.
Code that deal with realiability analysis.
contains the code that deals with the solution of the finite element problem.
Utility classes and functions.