Mat Slab design with column on pilaster

[structeng2]

Hello,

I have a question on how to check/verify typical foundation requirements (overturning, bearing pressure, etc.) when I have a steel column mounted on a pilaster part of a continuous wall.

I guess I am not sure how you would figure out what your 'footing' dimensions are to determine eccentricity, toe/heel pressure, and run through the rest of a typical spread footing calc. Or is there another method I should be using? It almost acts more like a continuous wall footing with a concentrated point load at the column location - however, the same question still stands, how to determine your footing dimensions if your 'footing' (mat slab) is continuous.

Thanks,
Peter

 

[structeng2]

 

[WARose]

Seems to me like a FEA analysis (which you would probably need for the mat part anyway) would tell you what you need to know.

If you had to do it on paper.....I think you could conservatively say you are "engaging" about 6.5 feet of slab (for OT).