Here you are a simply cantilever beam with CGAP node-to-node contact elements with allowable gap distance = 0.5 in. I have created the model in FEMAP V10.1.1, and I have included BCSET=1 in the case control to activate contact algorithm (to treat CGAP as linear contact elements, not springs, I don't understand yet why this is not done by default). I have requested to write all element forces in the F06 files (print & plot). But not any track of CGAP results, neither writen or ready for postprocess.
Here you are the nastran input to play with: