IS IT NECESSARY TO PUT MAIN BARS IN BOTTOM IN SLABS?

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Before explanation let we see the bending mechanism of the slabs.
Do this if you want more clear understanding. Take a long size note let it be your slab.
Now hold the two long sides and try to bend your hands towards you.
you can find that the shorter sides get sagging(i.e) bended the same goes for the one way slab.
So for the picture above you can see the span of the slab between the supports tends to sag or positive bending moment.
Hence the lower part of the slab subjected to tension, we all well known that concrete is weak in tension to over come that we provide Main reinforcement at the bottom of the slab.
The same goes for two way but in both the direction i.e in longer as well as shorter span.

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