clarifier effluent box
clarifier effluent box
(OP)
I have a circular clarifier with an effluent box that cantilevers off the clarifer wall. My concern is that this results in a bending moment that gets applied to the clarifier wall at the location of the effluent box. How do you account for this in the design of the clarifier walls? This moment would tend to distort the clarifier walls so that they are no longer circular. The clarifer has an interior diameter of 30 feet, and the effluent box is about 9' long and cantilevers about 4.5'.
Note, this is not a moment that is applied around the corcumference of the clarifier, it is only applied at the location of the effluent box.
Note, this is not a moment that is applied around the corcumference of the clarifier, it is only applied at the location of the effluent box.






RE: clarifier effluent box
We would most likely develop a finite element model using 6 DOF plate elements and analyze for moments in the plates. Just a 3D situation and difficult to approximate by hand.
RE: clarifier effluent box
One way to make this problem go away is to extend the walls of the effluent box down to the base slab elevation and put footings under them.
RE: clarifier effluent box
Might be tough to build them though.
RE: clarifier effluent box
It would be interesting to create a finite element model and see what the effect of a cantilevered effluent box is. Unfortunatley I have no experience creating models for something like a concrete plate structure. We have RISA 3D, but I mostly use it for analyzing steel framing.
I wonder how cantilvering the effluent box would have been handled in the "old" days of no computers and just calculators or slide rules. I love my HP, but I couldn't imagine doing a finite element analysis using it.
Thanks for your input JAE
RE: clarifier effluent box
However, You do need to be aware that this large dollop of concrete with increase the heat of hydration and induce cracking if not designed for.
RE: clarifier effluent box