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 - The Day Mom Drove the 8N - by Brian Browning. My Dad was wanting to put in a garden but couldn't operate the 8N and handle the old horse drawn plow he had found and rigged up to use with the tractor. Well, he decided to go get Mom out of the house and have her drive the tractor while he walked behind the plow. You got to understand that while my Mom is a hard worker who will always help whenever she can... she had never operated farm machinery before that day. Dad got her out there, explained how the clutch was the same as in our o
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