Answer Posted / soorya

silambarasan is wrong... In all drawings main reinforcement will be in shorter direction. We cannot decide only by using this option. What if all the rods, say for example 12 mm dia bar both sides each way is given... This again depends on the longer and the shorter span.
If ly/lx < 2 then it is a 2 way slab..This is the main criteria for identifying 2 way slab or 1 way slab.
According to structural point of view,
In 2 way slab loads will be carried in 2 directions, so main reinforcement is provided in 2 ways.
In 1 way slab loads will be carried in 1 direction, so main reinforcement is provided in 1 way.

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