A one way slab reinforcement supports 2 walls while a two way slab reinforcement supports 4 walls. The one way slab reinforcement only supports walls in one direction.
The reinforcement resisting flexure (bending) in the direction of the span.
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Ans: One way slab is the slab having ratio of longer span to shorter span equal to or more than 1.5 . If the ratio of longer span to shorter span is equal to or less than 1.5, then such slabs are called as two way slab. In one way slab main tensile reinforcement is placed parellel to shorter side which will be the main steel, where as in two way slab both direction required main steel.
if length/breadth equal or greater than 2 then its oneway slab and reinforcement is on the short span because moments are great near the supports
when l/b ratio more than or equal to 2 then slab is designed as one way and when l/b ratio is less than 2 then slab is designed as two way.
Crank lengths are used because the moments at the edge strips are negative while that at mid span are positive so reinforcement are alternatively provided at the top and bottom respectively.. so just to have connection between the reinforcement and for the slab to behave as a single unit by providing continuous bars, cranking is done in slabs..
It is one and the same thing according to IS 456-2000
if LY/LX>2 than we use one way slab if <2 than use two way slab.One way slab supported only two direction and two way slab supported in all four direction.
Slab penetrations are limited to the maximum area of a single cell. One must have a structural engineer determine the viability of creating a slab penetration any larger than the size of a single cell to determine if reinforcement is necessary.
Waffle slabs are two-way spanning slabs whose beams(in two diresctions) are at very close centres whereas a ribbed slab is a one way spanning slab whose secondary beams are at very close centres, but not their primary beams.
The basic difference between one way and two way slab is load distribution which is depends on support condition and span lengths.Mainly shorter span is carring larger load than longer span.This load distribution can be calculated considering the deflection at any point is same Shorter and Longer Span.
when the length of the slab is more or equal to twice the breadth hence it has to be one way slab.