I have designed a slab with 7 inch thickness and using 12 dia as main bar. Even though it is failing. What would be solution? Increasing depth further can't be uneconomical?
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Slab maximum thickness
Slab maximum thickness
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What do you mean by ''even though'' it is failing! If a slab is failing in design then you cant say that depth increase is uneconomical. Is it not?
You need to provide more clarity on what is failing and the entire details of the slab like its span.
You can do these steps below
1) Roughly Decide the slab thickness based on L/d ratio.
2) Arrive at the accurate Dead and Live loads
3) Design the slab for the considered depth and find the rebars needed.
4) If deflection is governing or driving the thickness, Recheck the depth by taking benefit of the steel provided in controlling deflection by adopting modification factor.
5) If you want you can also provide compression steel and then check the new thickness needed.
You can also divide the slabs in to smaller spans by providing beams to control thickness.
Coming back to the title of your post - Maximum thickness of slab - There is nothing like a maximum thickness. The thickness will depend on the deflections and the forces and this depends on the spans and loads.
There is some thing called sensible or practical thickness and again this depends on the above points.
If all these will be needed, I am not sure as you have not provided enough information 🙂