Height of the beam from flange to flange is 50 % of strength. The flanges do the other 50% (mass of material there). The web just keeps the flanges at the correct distance. The web transfers shear load from flange to flange. If the load support is in the approximate center (wheels/springs/gussets) the distributed load on the deck toward the front and back applies tensions the top flange, and puts compression load on the bottom. In my experience building Michigan Trains (trailers with 32 tires that carry 2-35,000 pound coils of steel) I worked on beams that had 1.5 inch X 8" top and bottom flanges with 1 inch webs, 28 inches tall. Repairing the rusty web is a good idea if in any doubt. There is no need to plate the whole thing, as it will only marginally help hold the flanges in proper spacing. We built 40 footers with 8 axles 5 air and 3 monoleaf. Jim
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Today's Featured Article - 12-Volt Conversions for 4-Cylinder Ford 2000 & 4000 Tractors - by Tommy Duvall. After two summers of having to park my old 1964 model 4000 gas 4 cyl. on a hill just in case the 6 volt system, for whatever reason, would not crank her, I decided to try the 12 volt conversion. After some research of convert or not, I decided to go ahead, the main reason being that this tractor was a working tractor, not a show tractor (yet). I did keep everything I replaced for the day I do want to restore her to showroom condition.
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