SAP 2000 is a CAD/CAm software very used for simulation of structures with some force apply to it. For example, you can simulate a house in a earthquark of 7 degres or simulate a boat sinking in the ocean and to verify its forces and pressures.
http://www.freedrive.com/ASP/PostFolderShortcut.asp?fsc=3089674
[upped by: jpokc]