ACI Guideline on Differential Settlement of Concrete Footings
ACI Guideline on Differential Settlement of Concrete Footings
(OP)
Hi,
I searched the forum but could not find an exact answer to my question. I hope I am not duplicating a previous question.
I am designing a footing for a ground storage tank with a diameter of 110 feet. Bearing pressure will be around 1,800 psf. It looks like we can go with shallow footings, only if we can satisfy the differential settlement requirement of such tanks. One of my collegues told me that ACI (332?) have some requirements on differential settlement such that for every 10 feet of radius, one fourth of an inch of differential settlement is allowed.
This seemed kind of high to me and I could not find the reference to support it. Do you have any information regarding this reference?
Thanks.
I searched the forum but could not find an exact answer to my question. I hope I am not duplicating a previous question.
I am designing a footing for a ground storage tank with a diameter of 110 feet. Bearing pressure will be around 1,800 psf. It looks like we can go with shallow footings, only if we can satisfy the differential settlement requirement of such tanks. One of my collegues told me that ACI (332?) have some requirements on differential settlement such that for every 10 feet of radius, one fourth of an inch of differential settlement is allowed.
This seemed kind of high to me and I could not find the reference to support it. Do you have any information regarding this reference?
Thanks.





RE: ACI Guideline on Differential Settlement of Concrete Footings
RE: ACI Guideline on Differential Settlement of Concrete Footings
RE: ACI Guideline on Differential Settlement of Concrete Footings
RE: ACI Guideline on Differential Settlement of Concrete Footings
All the storage tank designs (water, chlorine, etc.) I have been involved so far included some type of foundation, either it is mat foundation or deep foundations based on the soil profile. A stable base never came to my attention as an option. How do you design that; just install a 5-foot-thick granular pad and do not worry about total or differential settlement? How do you calculate the settlement for such a base? Do you treat as a shallow footing in settlement calculations?
I will check into API codes, too.
Thanks.
RE: ACI Guideline on Differential Settlement of Concrete Footings