Soil Overburden on Mat Slab
RISAFoundation can apply soil overburden to a mat slab to account for the weight of the soil above the foundation. Simply enter a Soil Overburden...
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RISAFoundation includes the added ability to enter a passive pressure for slabs. The passive pressure represents soil pressure along the perimeter of the slab and will contribute to the sliding resistance of the slab.
RISAFoundation will multiply the passive pressure by the vertical area along the slab’s perimeter in both the slab’s local z and local x direction. This passive force will then be added to the sliding resistance due to friction in the Safety Factors spreadsheet.
In the below example we have a 10’ x 10’ x 1’-0” slab and we have set a passive pressure of 0.25 ksf.
The sliding resistance due to passive pressure in one direction would therefore be equal to 0.25 ksf x 10’ width x 1’ depth = 2.5 kips. This would be added to the sliding resistance due to friction which is equal to 0.145 kcf x 10’ x 10’ x 1’ x 0.3 = 4.35 kips. Total resistance = 2.5 kips + 4.35 kips = 6.85 kips. We can confirm this within the Safety Factors spreadsheet.
Foundation Design according to Eurocode 2
Admin : Aug 30, 2019 12:00:00 AM
RISAFoundation v12 includes mat slab, concrete beam and pedestal design according to Eurocode 2. For more information, check out the video...
Varying Soil Properties in RISAFoundation
Admin : Jul 14, 2011 12:00:00 AM
While RISAFoundation has a Default soil properties (Subgrade Modulus and Allowable Bearing), it is possible to create regions of varying soil...