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Foundation Reinforcement

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Joseph Harouni wrote:

>>Is there a minimum foundation reinforcement requirement aside from the
.0018xAg of shrinkage?<<

Joseph,

It depends on whether your foundation "looks" like a beam or "looks" like a 
slab.  For combined footings (which look more like a beam), I use the 
minimum  reinforcing requirements for beams.

One way to visualize whether your footing is a slab or a beam is to turn it 
upside down, with the column loads now becoming equivalent to the reactions 
and the soil pressure now the loading.  Then decide if this was up in the 
structure, would you design it as a beam or a slab.

Hope this helps.

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