Does anyone have a handy formula for concrete stresses in a SOG with a point load at the edge? Input information would be the Load, the area or dimensions, the soil k value, the slab thickness, a safety factor or LRFD info, and the concrete strength.
Thanks, in advance…
@dik I just use the ACI Slab on Grade document. It has equations for that condition. If I recall correctly they are not a function of overall slab dimension though. Point load away from edge, point load near edge but away from corner, and point load at a corner are the conditions they address I believe.
Do you have a reference name to the document? I’ll see if I can dig up a copy…
@dik Yes. ACI 360R-06 Design of Slabs on Ground. The equations are pretty much the same as the Roark’s plates equations for point loads on plates on elastic foundations. I tried taking a screenshot of the relevant pages.
You are welcome. Hope it helps.
Found a copy… good publication.
The equation 6-2 looked curious, with its exponent of “0.6”.
That’s either empirically determined, or worked out with a pretty complicated analytical process.
Roark would put an interesting twist in your report:
This reply is probably too late to help you, but I joined this site only today. A few years ago I developed a spreadsheet that exactly solves the analysis problem you pose: the stresses and deflections imposed by a loaded area in the vicinity of the edge of a semi-infinite slab on an elastic foundation. You can download it from my web site, http://rmniall.com
Thanks… will take a gander.
@Dik: Just don’t get goosed!