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Must determine structural suitability of A283D spec'd steel bars, knowing A283D is a good boiler/pressure-vessel steel but not knowing its structural characteristics for spanning HEAVY loads as a bar. I wish to substitute A36-50, and do not know if it is a suitable match. EOR refuses to say...

Okay, I could have gotten esoteric and blathered about parabolic load distribution (with a flattened "yield" zone directly under shore post leg force, etc) plus pressure zones extending from the parabolic along/aside those load-stress distribution diagrams, but the question remains: why should a...

This is my business, and has for over 40 years. We figure soil bearing @ 1000 psf if your foot leaves an imprint in it or 4000 if you can't stomp a 'vee' in it with your heel. Dumb? Not really, if it works. Point is, shoreframe legs @ 5K or 10K don't need that many square feet to spread the joy...

Which "code"? OSHA requires handrails to "withstand" a 200 lb force in any direction, including its fastenings. You can define "withstand" any way you wish. I use material & conn yield point as "failure to withstand". Thus, there's a factor of safety from 'yield' to 'ultimate' of any assembly...