ning
Elite Member
At a minimum I'd consider renting some of those 1" steel plates, drop them on top, so that the load is spread across the concrete.
You lose the bet.A track loader? How long are it's tracks?
You said the bridge was 12' long. Is that the span underneath, or the top deck length? The free span is what we need to focus on. I bet the tracks on the machine are as long as you bridge.
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I would limit the yield strength of the steel to 15 ksi. This will at least address some degree of degradation and lower material strength due to age. Steel has come a long way during the past few decades.Find steel table with capacity of the beams , ignore deck for load capacity.