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Point load on basement slab

A " skeptic" remains among us? Much of what Mark has stated in the past remains true, however in many states picking and choosing your issues remains allowed.
 
redeyedfly said:
The 12" is the punch shear dim. Assume a 45 deg shear plane through the slab (footing) from the edge of the column. So a 4" square column would have a 12" square effective bearing area. That assumes no reinforcment. It gets much more engineery once you start adding reinforcement and your footing becomes a bending plate with spring supports.

I would be ok with a 1500# point load on a 4" slab by inspection.
Click to expand...
I just want to weigh in with a thumbs up for use of the term "engineery". gonna have to borrow that one :)
 
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