Rectangular Tank Corner Reinforcement
Rectangular Tank Corner Reinforcement
(OP)
I am working on a rectangular SBR tank for a wastewater treatment plant, and I reviewed some standard details on drawings we have by another engineering firm. For liquid containing tanks they add extra steel, same size and spacing, at the corners offset with the main reinforcing.
Is this something that is normally done? I did not see it mentioned in PCA's Rectangular Tanks.
Is this something that is normally done? I did not see it mentioned in PCA's Rectangular Tanks.






RE: Rectangular Tank Corner Reinforcement
The PCA's Book is pretty tough to use. If you can get a copy of the Bureau of Reclamation's "Moment and Reactions for Rectangular Plates" (out of print), you'll find it more useful.
RE: Rectangular Tank Corner Reinforcement
I've also seen inside corner chamfers at wall intersections as well. Diagonal corner bars are lapped with horizontal bars at corners of some of the larger tank designs.
RE: Rectangular Tank Corner Reinforcement
There was a recent discussion of this issue in this forum. I suggest having a look at the comments, as well as reviewing some of the papers quoted, a number of which are by Nilsson et al.
RE: Rectangular Tank Corner Reinforcement
thread507-228698: corner r/f in concrete wall
RE: Rectangular Tank Corner Reinforcement
What would be the reason that these standard details did not use the extra steel in non-liquid containing tanks?
I did find a copy of the "Moment and Reactions for Rectangular Plates" online in pdf form.
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RE: Rectangular Tank Corner Reinforcement
RE: Rectangular Tank Corner Reinforcement
Long time ago, I used these tables to obtain moment and reaction. Now I look at this table and a little lost.
RE: Rectangular Tank Corner Reinforcement
I am designing a tank, but I was looking at the details on some old drawings we have for ideas.
I understand the larger moment in the corners and that extra steel is required for the tensile force due to the shear in adjacent wall.
The details I was looking at show the reinforcement required by analysis on the main drawing sheets. Then the details show extra steel (not required by analysis) only for liquid containing tanks.
So if by analysis I need #5 @ 12, is it common practice to use #5 @ 6 if my analysis shows I do not need that much?
RE: Rectangular Tank Corner Reinforcement
At the corners, we simply provide L bars with tension splice length pass beyond the interior face of the transverse wall in both faces (fool proof), and keep all other bars straight. The location of splices can be staggered to further avoid congestion and concentration of weak plane. Fillet is used for thinner walls, or structures containg flow water with wave effect.
So far being successful.
RE: Rectangular Tank Corner Reinforcement
Reinforcing required for water retaining structures is greater than that required for non water retaining structures, a result of the durability factor, "S", in ACI 350. So, when you say "the reinforcement required by analysis on the main drawing sheets", you need to say whether you mean required by analysis of a water retaining structure (covered by ACI350) or by analysis of a normal concrete structure (covered by ACI318). That said, if the reinforcing shown on the main drawing sheets meets the requirements for a water retaining structure (ACI350), then I see no need to add extra reinforcing on the detail sheets.
RE: Rectangular Tank Corner Reinforcement
Yes I do mean the reinforcement required for a water tank (ACI 350)when I said "required by analysis"
RE: Rectangular Tank Corner Reinforcement
A question. Sounds like you are reviewing a facility where the designer has some tanks that are designed as water retaining structures and some buildings that are not. And, it sounds like he/she has economized by using the same details for both?
RE: Rectangular Tank Corner Reinforcement
RE: Rectangular Tank Corner Reinforcement
RE: Rectangular Tank Corner Reinforcement
pressure on the sides as the depth increases vs
dry containers?
RE: Rectangular Tank Corner Reinforcement