I don't know where that Barn was built, but it looks like it was either a Cantilever Barn or a spin off of one. The Cantilever barns built in the 1800's with cribs on each side, but very more sturdy looking than what yours shows. they were whole logs notched one the ends so they could fit together with no nails. These barns are mostly in the Appalachian area, there are a lot of them in east Tennessee, but like all Barns that have any age, they are going fast. I have pictures of a lot of barns since I've been in east Tennessee, I know of at least 15 barns within the last 14 years that were torn down. If this is the type of barn your grandparents had I have pictures that I have drawn which are exteriors, and I have some pictures of a Cantilever that is just the frame work if I can find it if you need some pics to help you.