Under ground circular chamber
Under ground circular chamber
(OP)
Hi there,
I am trying to figure out the effect of a point load on and under ground circular concrete chamber.
I began by looking at hoop stresses etc and thought that the earth load will cause the chamber to go into hoop compression. But I don't think a point load will cause pure compression throughout the chamber. Perhaps looking at it like an arch? If anyone has any usefull formulae for working out moments for this scenario, would be great.
The chamber could be assumed to either fixed or pinned at the base and top, depending on formulae. The support conditon can be detailed later when looking at rebar.
Many thanks
I am trying to figure out the effect of a point load on and under ground circular concrete chamber.
I began by looking at hoop stresses etc and thought that the earth load will cause the chamber to go into hoop compression. But I don't think a point load will cause pure compression throughout the chamber. Perhaps looking at it like an arch? If anyone has any usefull formulae for working out moments for this scenario, would be great.
The chamber could be assumed to either fixed or pinned at the base and top, depending on formulae. The support conditon can be detailed later when looking at rebar.
Many thanks






RE: Under ground circular chamber
BA
RE: Under ground circular chamber
Richard A. Cornelius, P.E.
WWW.amlinereast.com
RE: Under ground circular chamber
There is design information available for radial loads on cylinders, specifically radial nozzles on pressure vessels. It may be difficult to apply to your case, though, due to the thickness of the wall (may run out of the charts). WRC-107 was the standard source for this type of design, although it was recently pointed out that there is now a replacement standard. You would need to assume loading over a square or circular area rather than a "point".