On this page:

Why doesn't soil bearing change when I edit slab reinforcement?

ANSWER: Nonlinear cracked-section analysis 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.

See Also

Modeling uplift and foundations on soil supports article

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.

Browser not supported