Lomapaseo
I'm not familiar with the terminology being used here. Are you suggestiing that what we see is a piece of outer skin or rather an interior bulkhead
Frames are the "hoops" that run the circumference of the fuselage, and to which the longitudinal stringers are connected. The skin panels are then attached to them both.
Yes, it appears to me that object in question is a piece of frame, or a length of skin with a stringer attached that is bent 90º to appear on edge.