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Re: stack foundation

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Michael Bryson wrote:

>>You say you use a factor of safety of 1.76 for overturning? But this using
allowable soil pressures or factored soil pressures? If the former, then
you're factor of safety would be higher, yes?<<

Isn't resistance to overturning independent of soil pressures?  Isn't it the 
difference between the gravity load resisting moments about the toe minus the 
overturning moments due to applied forces about the same location?  Would not 
including the soil pressures always give you zero overturning? (Sum M = 0 
from statics.) 

A. Roger Turk, P.E.(Structural)
Tucson, Arizona

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