WEIRD values in SAFE

[lbengineer1]

Dears,

i was designing a simple footing under a column using SAFE.
Loads are vertical force T and a moment M.
in comparing with manual calculus, the soil pressure obtained are correct. But i found a problem with the moments strip diagrams. i found it illogical since the diagram has a discontinuity equal to the applied moment value.

isn't the final soil pressure (positive in my case) that must be used to find the moments. if so, where does this discontinuity come from?

 

[KootK]

The discontinuity makes sense to me. If you do a free body diagram of the footing alone and neglect self weight, there will be two sources of bending moment: the soil reaction AND the concentrated load applied by the column. It's similar to the moment jump that you'll see in an elevated slab design strip across the columns.

I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.