09-01-2010, 12:06 PM
Another name of the Interaction Diagram is Capacity Surface. For me, the later makes more sense. I suggest that you should read the book - Reinforced Concrete Mechanics and Design (MacGregor) which you can download from our lovely site. This book includes almost everything about the interaction diagram (from the basic concept to method of calculation and worked example). In case that you need a more professional software to analysis the cross section and generate the diagram, you should consider CSi Section Builder or Gala.
Sincerely,
Sincerely,