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Thanks to all. Nobody said anything about "None Shrinking Concrete". I agree with Dave & JAE. The other problem with putting any joints is that the joints have to continue vertically in the walls. You cannot put joints on slab and not in the walls. Then, the job will cost more to form. The...

The footing slab of the 40-ft underground concrete tank I am working on will need to withstand uplift pressure (almost 35'). It does act as a ballast. Can I do 90' x60' x 12' thick slab in one pour with no joints assuming the contractor can do it..? ACI 224 talks about 24 to 36 times the slab...

I tend to agree with Dave. If you calculate your steel for moment, you would find it is more than adequate for shear friction. The compression steel is really a tension steel for opposite loading conditions and I would not count on it. I believe we should add steel only if the flexural...

meicz: Thank you so much for the referal. I read it all, and I concluded that no additional steel should be provided if the flexural steel is adequate to transfer the shear force using the shear friction formula. I have never done anything more than calling for "intentionally roughened...

Can you count the flexural reinforcement across a wall construction joint in calculating the shear friction reinforcement needed to transfer the shear into the footing..? ACI 318 is not clear on that..!

I will check shear at a distance d. As far as Risa, our model has 2'x2' mesh.

Thanks to all of you for the great comments and tips. Below are some answers to the questions came up: - The walls will be stepped up may be three times (Tapering may cost more) - Internal Bracings are included the design - We are looking at the shear at the bottom of the Wall not at a...

Yes I did (5,000 psi). Thank you again.

Thank you, I will check if this helps. Some people suggested using Shear Friction reinforcement, but I was not sure about that..!

I am working a 40'-deep underground rectangular concrete tank. Due to soil and Hydrostatic pressure loading, the wall thickness is becoming over 5 feet near the bottom. Any ideas to reduce the wall thickness..? Can I use additional vertical reinforcement to help withstand the shear...? Thank You.

I am working a 40'-deep underground rectangular concrete tank. Due to soil and Hydrostatic pressure loading, the wall thickness is becoming over 5 feet near the bottom. Any ideas to reduce the wall thickness..? Can I use additional vertical reinforcement to help withstand the shear...?