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FOOTINGS SUBJECT TO UPLIFT

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How do you go about finding a top footing moment, due to uplift.  I am trying not to use top reinforcment in the footing and depend only on satisfying the equation   Mn = 5 (fc')^1/2 S. 
 
Does the uplift value  matter ?
 
Can I just use the weight of the footing, the soil and the slab above the footing to find the moment.
 
 
Thanks in advance for your in put.
 
John