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Thanks Wrat, i tried to narrow the basics down as much as i thought necessary for the answer i needed, all variables aside:
(4) I-beams at 20ft lengths
spaced 4 ft apart
uniform load across 20ft...

Hello all, i'm looking for other opinions/clarification on a rebuild of our covered bridge ( I-beam ) selection.
calculations for the new beams based off a friend of a friend .
Our bridge is a...