Net Uplift

The size of spread footings is automatically increased so that the user specified minimum safety factor against net uplift is met. This value is calculated as:

{F S}_{uplift} = \frac{F_{L} \times (W_{f} + Q_{f})}{P_{s}}

Equation 4-12

where

F_L	=	Dead load factor for controlling soil load combination
W_f	=	Weight of the footing
Q_f	=	Footing surcharge load
P_s	=	Controlling combined column load using soil load combinations