One-way slabs transfer the imposed loads in one direction only. They may be supported on two opposite sides only
in which the structural action is essentially one-way, the loads being carried in direction perpendicular to
the supporting beams or walls.
But rectangular slabs often have such proportions and supports (e.g., relatively deep, stiff monolithic concrete beams)
that result in two-way action. At any point, such slabs are curved in both directions resulting in biaxial
bending moments. It is convenient to think of such slabs as consisting of two sets of parallel strips, in each direction
and intersecting each other. So part of the load is carried by one set and the remainder by the other.
Analysis of Two-way Slabs by Coefficient Method
The determination of exact moments in two-way slabs with various support conditions is mathematically formidable
and not suited to design practice. Various simplified methods are therefore adopted for determining moments, shears
and reactions in such slabs. Quite popular and widely used among these methods is one using ‘Moment Coefficient’
based on the 1963 ACI Code, for the special case of two-way slabs supported on four sides by relatively stiff beams.
One-way and two-way slab Design
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