i'm going to show you some of the
ultimate limit state that a spread
foundation must be designed to withstand
if we take an example
spread foundation and a column sitting on it
the first one is overturning
basically loss of stability
so if you apply a bending moment
it could
overturn
the second one is
sliding
so in this case
it could slide
from this position to
this position
the third one is bearing failure
so if we apply a load here
this load
could cause a bearing failure
the fourth one is structural failure
so when you apply a load
the spread foundation could
in fact
fail structurally
and finally this could be a combination of any of these
an example
it could be a combination of
structural failure and ground failure
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