Hoist ring capacity
Hoist ring capacity
(OP)
I need some direction in determining the capacity of a hoist ring mounted on the ceiling of a 35-ft diameter concrete tunnel. The hoist ring is welded to an embeded piece of channel steel, which is anchored by 4x 16" #8 rebar with tails, offset 7'-6" from the tunnel centerline. The ring is bevel welded to the channel steel such that it is vertical. The hoist ring is A36 steel, 1.75" diameter, in a u-shape with the legs being 6" long and the radius of the half-circle being 6" (total height of the u being 12"). Old design documents (1960's) say the design capacity of the hoist ring is 8,000 lbs. but I would like to figure out how they came to that conclusion given that the anchorage and channel steel has a much greater capacity.
Thanks for looking.
Thanks for looking.





RE: Hoist ring capacity
So, assume the design load was 40,000 lbs. Now look at the rating.
RE: Hoist ring capacity
RE: Hoist ring capacity
Thanks chicopee, I suspect that the possiblity of loading at angles other than 0° may also play into this. By Crosby manual, are you referring to The Crosby Group products? If so, what product number/catalog are you referring to? I briefly looked on www.thecrosbygroup.com and didn't see a match to the hoist ring I am researching.
RE: Hoist ring capacity