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k, thanks KootK, I follow your reasoning =)... actually thanks to everyone who contributed, you've all been helpful

...was hoping to reach some consensus here...if I state 0018bh is required for the top when Mcr is exceeded in +BM but don't need any top steel when +BM stays below Mcr would that be ok? (again, -BM <<< +BM). And then, which Mcr do I use? theoretical or factor reduced? I would like to save my...

I believe ACI limits concrete tensile stress to 5*SQRT(f'c) for plain concrete design. The modulus of rupture of concrete is usually taken as 7.5*SQRT(f'c) so it appears ACI does not want you to approach cracking levels. Also, ACI uses a reduction factor of .6 for plain concrete which is quite...

"You could let the plain footing resist the negative bending as a plain concrete section as long as it is allowed" That's exactly the point I'm unsure about, is it still allowed when I've surpassed Mcr in positive bending? Does not plain concrete design require everything remain uncracked for...

Supposing the footing exceeds Mcr for positive moment (which it does) how would I compute the neg. moment capacity of the footing? Could I use the uncracked value? (the neg. BM is only a tiny tiny fraction of Mcr as mentioned previously)... or something else?

There is bottom steel though... I'm not sure I'm comfortable labeling this footing as plain concrete(?)

Hello all, I'm investigating a footing with an eccentric load which results in a partial triangular soil pressure response. When I calculate bending moments I get negative values in the area where soil pressures are zero because of the footing concrete weight (footing is 4' thick). I checked the...

yeah I was unsure about that and so my question. But the neg. moment is very very tiny. I'll just stick to code then and provide the min. rebar at the top

Hello to all, if I have a footing with bottom reinforcement only that undergoes moment reversal (say Mreversal= -100) and then I calculate the uncracked moment for rupture at the top fiber and find it to be much much larger like Mcr = 2000 would I still have to provide minimum top reinforcement...