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STAAD Foundation Combined Footing Contact Area

Louis Flores
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Hi,

I have several question with regard to how STAAD Foundation work with regard to the combined footing’s contact area:

  1. In STAAD Foundation, what are the scenarios that would cause the footing to lose contact with the soil? 
  2. Why is the column referring to the “Area of Footing in Contact with Soil” in the combined footing’s calculation sheet is missing? (see attached photo)
  3. It was made known to me that STAAD Foundation provides top transverse reinforcements for combined footings to account for loss of contact with the soil. How does it determine if there is loss of contact and hence a need to provide such reinforcements?
  4. Does STAAD Foundation always provides for top transverse reinforcements for combined footings regardless if the footing is in full contact or not with soil?

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    Answer to Q1 : (P/A)-(MX/SX)-(MZ/SZ) is negative.

    Answer to Q2- Two tables are reported for combined footing for the service load cases. The upper table shows the raw values of corner pressures (meaning, corners with negative pressures are reported with a negative value). In this table, the area that is out of contact is reported. The lower table is showing the re adjusted corner pressures so that any corner with negative pressure would see its value transformed to zero. In the lower table, the area out of contact is not reported.

    Answer to Q3 and Q4- In recent versions, SFA requires the combined footing to be in full contact with soil for ultimate load cases (this is a limitation) Partial out of contact will be implemented for ultimate cases soon. Top transverse reinforcement is being provided irrespective of loss of contact, considering an accidental situation.

    Answer Verified By: Louis Flores 

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