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What is the punch through strength of 3/4" plywood.?
I need to build an elevated pad to support up to 6,000 lb. The material would be moved from a freight elevator into the building on a pallet jack. I would be using 5 ply, 3/4" plywood class 1 with a capacity of 1,600 psf when supported at 8" c/c.
The jack has 4 wheels; 6000 lb./4 = 1,500 lb. per wheel. This is within the limits of a single sheet of plywood. Kind of...I'm leaving out the psf or psi. However, if I take the actual contact area of the wheels, approx. 2 sq. in. each, I get 1,500 lb/2 in^2 = 750 psi. Way more than the 11.11 psi I figured from the allowable 1,600 psf.
Am I missing something or what? Thanks for any help.
2 Answers
- Anonymous1 decade agoFavorite Answer
You are only considering a static load. In reality, you need to also account for the fact that your force will be more than just the weight. You are moving your load around, so there will be additional accelerations besides gravity...
You probably want to have some kind of (steel?) pads on your plywood to help distribute the load from your wheels. You have a lot of force acting on a small area of wood. I think you will at the very least create dimples in your wood.
You probably should have some kind of a tubular steel frame welded up with provisions for a plywood floor that you can replace as it wears or weathers.
- Anonymous5 years ago
Take a deep breath and don't punch the screen, you'll just hurt your hand.