What Is A One Way Slab
As per IS 456:2000, the ratio of longer span (l) to shorter span (b) which is (L/B) greater than 2 is known as one-way slab. In practice, a one-way slab is supported by only two parallel beams or walls. We usually don't use unidirectional boards often.
Detail of the One Way slab
The most straightforward routine structural element to illustrate the design provisions of the Code is a one-way slab.A one-way slab is defined for book functions as a flexural element with a thickness small relative to other dimensions, a bearing (gravity) load acting perpendicular to the surface and directly above its surface, spanned in one direction between parallel supports, and reinforced for bending in that direction only. For analysis purposes, unidirectional slabs may be clamped to a certain extent in the supports or possibly released.
A number of provisions of the code refer to "flexural elements", including one-way and two-way slabs, beams, girders, footings and also where bending occurs along with axial walls, loads and columns. In general, when this code provision is intended to apply to unidirectional slabs, the term shall be used as defined herein. If the slab is supported on four sides and if Ly/Lx ≥ 2 unidirectional slab.
For any slab, if Ly = Lx, the slab tends to bend in both directions. As Ly increases, the bending tendency along Ly decreases and at Lx increases.When Ly/Lx ≥ 2, the slab bends only in the X directions when Ly/Lx ≥ 2, the slab is called a unidirectional slab. One-way slab, main reinforcement is secured along Lx (short span) If the slab is supported on four sides and if Ly/Lx ≥ 2 unidirectional slab.
For any slab, if Ly = Lx, the slab bends to bend in both directions. As Ly increases, the bending tendency along Ly decreases and at Lx increases.When Ly/Lx ≥ 2, the slab bends only in the X directions when Ly/Lx ≥ 2, the slab is called a unidirectional slab. One-way slab, main reinforcement is secured along Lx (short span)
Detail of two-way slab
A two-way streets is a street that allows vehicle to travel in both direction. On most two-way streets, especially major streets, a line is painted in the middle of the road to remind drivers to stay on their side of the road. Sometimes one part of the street is two-way and the other part is one-way.
Design considerations for two-way wall-supported slabs are similar to those for one-way slabs.The slab thickness is generally based on deflection control criteria and the stiffeners in the two orthogonal directions are designed to resist the calculated maximum bending moments in the respective directions at the critical sections. [In some cases additional reinforcement may be required at the corners of two-way slabs as explained later].
The thickness of the slab should be sufficient to resist shear, although shear is not usually a problem in two-way slabs subjected to uniformly distributed loads. If the slab is supported on all four edges and if Ly/Lx < 2,
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