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Calculations needed - Determine thickness of angle iron to use

I am working on making a track out of angle iron that V-groove casters of a gantry will ride on. A length of angle iron will be welded, concave side down, onto a length of flat steel which will be secured to a concrete floor. Two tracks will be made running parallel to one another, and the four V-groove casters of a gantry will ride along on top of these two tracks; two casters per track. I am having a hard time finding the correct equations for determining the thickness of angle iron to be used under the weight of the gantry and a suspended load. Essentially, the cross section is a beam bent at 90° and rigid on both ends. Is the following equation the first step in the right direction? Thank you.

[url]https://www.engineersedge.com/beam_bending/beam_bending4.htm[/url]

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