[MrForbes]

My son was trying to use Inventor's FEA to figure out maximum stress on a section of ramp, but could not figure out how to set up the loading to represent pinned connections at the ends, they always came out fixed, as in your picture.

so he figured out how to roughly calculate the moment of inertia of the section, and calculated stress due to bending using the good old formula, with pencil and paper. Then we tested it by building a section and supporting it freely at the ends and standing on it.