jackbepablo-
Most polytunnels have a foot or so of extra material. Normally this is folded into a trench outside the footprint and buried to hold it down.
Internally I also drove metposts into the ground next to each upright and wired the uprights to lengths of 3x3 to stop the frame flexing in the wind (and work hardening = snapping).
I also did a bit of triangulation around the frame internally with more lengths of tube and duct tape.
I can see wooden framed raised beds replacing my posts if they are along the sides and wired to the uprights?
Anyway, my cheap as chips Amazon tunnel is huge and has weathered quite a few storms on our wind tunnel of an allotment (north south orientation, both allotments and tunnel).
Worth going the extra mile to avoid the heartbreak of turning up and finding it smashed - or worse. The tunnel on a neighbouring plot just disappeared a few weeks ago!
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RagnarHairybreeks
If and when I get another poly tunnel I will put raised beds inside primarily to hold it down