Page Comparison

h2. Why doesn't soil bearing change when I edit slab reinforcement?

*ANSWER:* Nonlinear [cracked-section analysis|safe:Cracked-section analysis] must be performed for rebar to affect the stiffness of a model. This may be accomplished as follows:

* ChooseSelect Run > Cracking Analysis, then choose the source of reinforcement which the software should use to calculate cracked-section properties. Options are available through Run > Cracking Analysis.

* Create [load cases|kb:Load case] through Define > Load Cases, assign various [load patterns|kb:Load pattern], 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.
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** *NOTE* -- If a beam is added, the effect will depend on such factors as its location and stiffness.
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** *NOTE* -- Increasing mat thickness is typically more efficient than adding reinforcement when looking to improve bearing pressure distribution.

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*Related Incident:*
* {incident:no=47194|comment=SAFE 12.3.2 design question}
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h2. See Also

* [safe:Modeling uplift and foundations on soil supports] article

* [safe:Cracking] section


h2. 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.

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*Related Incident:*
* {incident:no=46800|comment=SAFE Foundation}
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