...
Why
...
doesn't
...
soil
...
bearing
...
change
...
when
...
I
...
edit
...
slab
...
reinforcement?
...
ANSWER:
...
Nonlinear
...
...
...
must
...
be
...
performed
...
for
...
rebar
...
to
...
affect
...
the
...
stiffness
...
of
...
a
...
model.
...
This
...
may
...
be
...
accomplished
...
as
...
follows:
...
- Select
...
- Run
...
- >
...
- Cracking
...
- Analysis,
...
- then
...
- choose
...
- the
...
- source
...
- of
...
- reinforcement
...
- which
...
- the
...
- software
...
- should
...
- use
...
- to
...
- calculate
...
- cracked-section
...
- properties.
...
- Create load cases through Define > Load Cases, assign various load patterns, then select the Nonlinear Cracked Analysis type.
- Use these load cases to check pressures and compare against allowable limits.
- Modify the model as necessary and re-analyze until bearing stresses are acceptable.
- NOTE – If a beam is added, the effect will depend on such factors as its location and stiffness.
- NOTE – Increasing mat thickness is typically more efficient than adding reinforcement when looking to improve bearing pressure distribution.
- NOTE – If a beam is added, the effect will depend on such factors as its location and stiffness.
See Also
- Cracking section
How do I report the foundation soil pressures?
Extended Question: The Soil Pressures – Enveloping Summary table is organized by Panel, but these labels do not match my foundation Area Labels. How do I find which foundation corresponds with which panel? Can I print a table of the results for enveloped soil pressures per each foundation Area?
ANSWER: To identify panel location and geometry, select Tables > Results Summary > Panel Geometry. To obtain pressures based on area objects, select Tables > Nodal Results > Soil Pressures. An envelope load combination may be created to obtain results based on area objects.