You probably want something like this - mine's 7' diameter and 6' tall, but you could build one out of 3" PVC (mine's 4") and make it 5' diameter on the number (was actually the prototype I used the blueprints for to build mine).
Pretty simple, just cut some PVC and glue it together - almost no "real" construction skills involved - a third grader could do it.
EDIT: and if you really are growing strawberries (outside, I'd imagine?) than it'd be some pretty easy mods to just make it a straight wall of plant sites.
They pretty much have PVC fittings in every shape and size to make whatever structure you'd want - they're like Legos :)