About how much weight do you think 3/4 inch plywood could safely handle?
Woah, Loaded question if I ever heard one. - just ribbing you
You would ultimately need to provide a lot of specifics in order for anyone qualified enough to answer that question.
Definitely, don't look at me, but I know a
little about it.
Should we assume you are asking about grade C-D (CDX)? Higher grades are structurally superior - like what is used for concrete forms and I think has more to do with the adhesive used in between the plys, but I might be wrong.
Point loaded, plywood is pretty strong, but the more you spread the weight out the more it'll support - to a point (ok, that might be a pun...). That point being - How many layers of the plywood (most homes I've worked on have at least 2 layers of 5/8, and I think commercial properties are suppose to have 2 layers of 3/4), the strength of the supports under the plywood, the span, or distance between those supports, then the distance the supports themselves have to span. - Were talking structural engineering at this juncture. (Notice I didn't say, "at this point").
See what I mean about the "loaded" question.
Maybe explain what you would like to do and I'm sure some experience will chime in and get you going.
I know - I hate it when I go into a hardware store, or home center and ask, "Do you have any _______"? And I immediately get back, 'Well, what are you trying to do"? Argghhh! I hate that. A few times (in a wise a$$ mood) my reply has been, "What bearing does that have on whether you have any _____ or not".