This is silly. But circumstances have me calculating something that I for some reason cannot grasp.
A dolly has about 700lbs on it (350 per wheel). It's on a platform made with 2x8 joists, with 30" spans. the actual platform is a little worn and weathered, so they've got a new piece of 3/4" plywood on it. Then they're going to take the dolly down the ramp to a concrete sidwalk.
For the life of me, I can't calculate the load to prove the plywood won't break. I don't know if I'm not grabbing the right equation because I'm too detached from this kinda of problem, or if I need more coffee or what.
But basically, I need the shear strength, and the shear stress of said plywood with 30" spans. As long as my stress is lower than the strength I'm fine right?
Welcome to EE!
First I would start here ---> http://www.engineersedge.com/beam-deflection-menu.htm
Then, take a look at ---> http://www.engineersedge.com/mechani...ial_menu.shtml
You assmue to a degree that the plywood distributes the load evenly.
Also, proof loading the platform is as simple as getting a couple of well fed men to stand on the platform.
Unless I am misunderstanding something, but if the worn platform was OK, then surely a new piece of plywood would still be OK? Put the calculator away?
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