I know that the most basic figuring would net a useful result and I'm a bit embarrassed that I don't know where to start already. Sure I want a little safety margin so it's not on the teetering edge of buckling, but no sense going nuts on that and I'm not schooled about moments of inertia and shear strength and all that fancy physics, hehe. The ramps have to be manipulated by human muscles and I'd like to minimize any damage to self. I can just overbuild it, but as you know thicker steel translates to more weight, and it would be nice to make it just handle the intended load safely but not so heavy to handle 3 times what will ever be on it. I thought some kind of calculator would pop up at the top of the google search list, but no love there so far. So I plan to make a pair of ramps - basically yer standard ladder style - 1 foot wide each, 8 feet long (maybe a bit shorter if that's too problematic) and essentially each of the ramps will be made from 2 pieces of angle iron at 8 feet long (4 total) with angle iron, channel or something not yet determined for the tread "web". The cross pieces mostly just give the tires something to bear on while the "rails" bear the brunt of the load itself. Yea I know it depends on the design, but say I was going to build it from 2"x2" angle iron for the length. I just want to figure out how thick my material ought to be for some trailer ramps. I've been searching the net without success.
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