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Negative Pressure for the Concrete Foundation

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     Dear Sir,
     I am designing the open foundation for the shelters. The typical 
     problem is I am getting tension in the bottom of the footing. This 
     will leads to loss of contact between soil and footing bottom and 
     resulting to increase in the maximum bearing pressure.
     I was just looking for the formula to modify the the bearing pressure 
     due to loss of contact of footing.
     Please advise me regarding the same
     Arnik Doshi

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