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Applications of plate bending equations 2-way concrete slab design (eg. Roarks formulas)

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struct_eeyore

Structural
Feb 21, 2017
264
Hi all,

I'm wondering if anyone has had any success applying plate bending formulas, such as those found in Roarks Formulas for Stress and Strain, to 2-way concrete slab design. In particular I'm interested in a case with 3 edges simply supported and one edge free. (I dont have the FEM software to check the output, but maybe that's the way to confirm this). I'm questioning the deflection calculations more so than actual stress. I would guess as long as the moment is below cracking moment then results should be close (?). Any and all thoughts appreciated.
 
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Looking through, the plate types seem very much like those in Roarks. My question is more in terms of practical applicability - if someone has used such a method of analysis in a built slab with satisfactory results.
 
I have done it. But it wound up being the same steel all over the place. (Which raises some eyebrows in a commercial setting. Fortunately, it was a industrial job.) Roark's is going to give the max....not the in between that you may/may not need.
 
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