concrete slab on grade point loading: Enercalc vs. Ringo & Anderson
concrete slab on grade point loading: Enercalc vs. Ringo & Anderson
(OP)
I realize slab on grade point loading may be an old topic but has anyone noticed an order of magnitude discrepancy between Enercalc slab on grade capacity compared to the capacities given with the Ringo & Anderson formula?
Any opinion as to which is "more correct": the Enercalc formula, if I remember their help commentary, is based on FEA results while the Ringo & Anderson formula is empirical (and probably very very conservative). Enercalc results are on the order of 10x the capacity given by Ringo & Anderson.
Any opinion as to which is "more correct": the Enercalc formula, if I remember their help commentary, is based on FEA results while the Ringo & Anderson formula is empirical (and probably very very conservative). Enercalc results are on the order of 10x the capacity given by Ringo & Anderson.






RE: concrete slab on grade point loading: Enercalc vs. Ringo & Anderson
RE: concrete slab on grade point loading: Enercalc vs. Ringo & Anderson
When I am working on a problem, I never think about beauty but when I have finished, if the solution is not beautiful, I know it is wrong.
-R. Buckminster Fuller
RE: concrete slab on grade point loading: Enercalc vs. Ringo & Anderson
RE: concrete slab on grade point loading: Enercalc vs. Ringo & Anderson
I've read through the article and my primary complaint is that they never indicate what they consider to be a failure of the slab on grade. As best I can tell, they do not consider settlement or cracking to be a failure, just the inability of the slab to continue carrying load.
My second complaint is that I cannot track down several of their cited references, most notable reference 9 from the SEAOSC. I've had several conversations with SEAOSC and nobody has been able to find a copy of this.
Personally, I tend to look at where the slab is and what I would consider to be an acceptable risk.
I look at the Ringo results, I look at the Structure magazine results, and I look at the British TR-34 results, and make a judgement call.
RE: concrete slab on grade point loading: Enercalc vs. Ringo & Anderson
It's unnerving to tell clients the need to cut in footings for posts (say for a new mezzanine in a warehouse) based on Ringo numbers, but then have Enercalc results which show the slab DCR at 15%.