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Membrane Slab

Membrane Slab

Membrane Slab

(OP)
I'm designing the concrete foundation for a metal circular tank.  What are the advantage and disadvantages of using a membrane slab as defined in ACI 350-Appendix G?  Supposedly the design philosophy is that the slab is flexible enough to take any differential settlement while still remaining water-tight, but common sense seems to tell me that a super-thin slab would be more prone to leaking.  Any input or insight would be appreciated.

RE: Membrane Slab

I am wrestling with this same issue, although I am putting a concrete tank on the foundation instead of steel.  This adds the additional concern as to whether the membrane slab can handle the radial tension created by the tank. I will continue to reaserch this and let you know if I find anything.

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