hoop stress
 

hoop stress
5.0m diameter reinforced concrete collar, 1.5m deep and 2.0m width.
side design pressure from the earth to be 30kn/m-sq i am trying to find compression force to check concrete agains to compression.
could you tell me how to calculate hoop stress?
thank you
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pr/t ... from your post i'm not sure if the thickness is 2m (that'd leave a 1m hole, which looks a bit odd to me)
anyways ...
30e3*2.5/2 about 40knm-2