Three Columns in a Strap Footing

[EngrJS1]

Hi,

Can you have three collinear columns in a strap/cantilever footing or is it limited to 2 columns only?

 

[SlideRuleEra]

Any footing (including strap/cantilever) can have as many columns as needed... provided the footing is sized and shaped so that the footing contact pressure with soil is essentially uniform.

 

[JoshPlumSE]

Yes, you certainly can.

I suppose a lot of the example problems you might see for a strap footing wouldn't directly apply. So, you'd have to use 1st principles to get your shear and moment diagrams and such.

 

[Obinna1992]

It is possible to have more than two columns in a strap footing. However, at that point, you may begin to ask yourself if the effort is worth it since a continuous beam and slab footing (continuous reinforced strip) can be adopted in such cases.

Just as said above, the stability, bending moment, and shear forces of the footing will have to be derived from the first principles. See this article below for guidance;

Design of strap/cantilever footing