...
How
...
is
...
differential
...
settlement
...
modeled
...
within
...
SAFE?
...
Extended
...
Question:
...
The
...
ACI
...
Manual
...
of
...
Concrete
...
indicates
...
that
...
uniform
...
loading
...
will
...
cause
...
greater
...
deflection
...
toward
...
the
...
center
...
of
...
slabs.
...
To
...
model
...
this
...
effect,
...
ACI
...
recommends
...
minimizing
...
soil
...
stiffness
...
at
...
the
...
slab
...
center,
...
and
...
maximizing
...
stiffness
...
at
...
the
...
edges.
...
Can
...
SAFE
...
model
...
this
...
condition?
...
Answer:
...
Differential
...
settlement
...
may
...
be
...
modeled
...
and
...
calculated
...
within
...
...
by
...
using
...
multiple
...
slab
...
areas,
...
and
...
then
...
by
...
applying
...
soil
...
supports
...
to
...
each
...
area
...
of
...
the
...
foundation
...
according
...
to
...
recommendations
...
from
...
the
...
soil
...
report
...
or
...
the
...
geotechnical
...
engineer.
...
Properties
...
typically
...
vary
...
along
...
the
...
surface
...
of
...
the
...
slab,
...
with
...
greater
...
stiffness
...
values
...
toward
...
the
...
perimeter.
...
An
...
overview
...
of
...
this
...
topic
...
is
...
presented
...
in
...
the
...
CSI
...
Watch
...
&
...
Learn
...
videos
...
which
...
follow
...
:
...