What is the formula of one way slab?
What is the formula of one way slab?
One way slab definition According to 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 practical, One way slab is supported by only two parallel beams or walls.
How is one way slab reinforcement calculated?
Bar Bending Schedule of One way Slab
- Given data: Length = 5 m (5000 mm)
- Solution: The quantity is done into two steps.
- Formula: = (Total length – clear cover)/center to center spacing + 1.
- Main bar: = (5000 – (25+25))/100 + 1.
- Distribution bar: = (2000 – ( 25 + 25))/125 + 1.
- Cutting Length.
- Cutting Length:
- Distribution Bar:
What is the minimum reinforcement in slab?
Minimum reinforcement is 0.12% for HYSD bars and 0.15% for mild steel bars. The diameter of bar generally used in slabs are: 6 mm, 8 mm, 10 mm, 12mm and 16mm. The maximum diameter of bar used in slab should not exceed 1/8 of the total thickness of slab.
What is a one-way slab?
The one-way slab is a slab, which is supported by parallel walls or beams, and whose length to breadth ratio is equal to or greater than two and it bends in only one direction (spanning direction) while it is transferring the loads to the two supporting walls or beams, because of its geometry.
Where is one way slab used?
The slab is majorly the horizontal structural element of any building/house which is used to construct floors, ceilings and roofs. Generally, it can be simply supported, continuous, or cantilever. The slab is an element of the building which transfers the different types of floor load to the beams.
Which slab is better one way or two way?
If L/b the ratio is greater than or equal 2 or then it is considered a one-way slab. If L/b the ratio is less than 2 then it is considered a two-way slab. The one-way slab is supported by a beam on two opposite side only. The two-way slab is supported by the beam on all four sides.
What is the minimum depth of one way slab?
… ℎ í µí±ší µí±–í µí±› is given in Table 4, with an absolute minimum thickness of 1.5 in (38.1 mm). The values of Table 4 are applicable for normal weight concrete and í µí±“ í µí±¦ = 60,000 psi.
Where is one way slab and two way slab used?
The deflected shape of the one-way slab is cylindrical. Whereas the deflected shape of the two-way slab is a dish or saucer-like shape. Chajja and Varandha are practical examples of one-way slab. Whereas two-way slabs are used in constructive floors of the Multistorey building.
What is the maximum reinforcement in slab?
And maximum reinforcement in slab is restricted to 1 to 2% of total gross sectional area (B×D), where B is width of slab and D is over all depth of slab including cover.
Why is there no shear reinforcement in slabs?
For reinforced concrete (RC) slabs without shear reinforcement, shear and punching can be the governing failure mode at the ultimate limit state if subjected to large concentrated loads. Shear and punching of RC slabs without shear reinforcement has been a challenging problem in assessment based on current standards.
What is the formula for one way slab?
Formula: One way slab = Longer span /Shorter span ≥ 2 In those slabs, in a shorter span, the main reinforcement was provided and in the transverse direction, the distribution bars were provided. Design consideration of one-way slabs:
How much reinforcement should be used in one way slabs?
The reinforcement diameter use in one-way slabs will not exceed the 1/8 of the slab total depth. The horizontal spacing between the parallel main steel bars is always less than of the, Three times the slab effective depth, or maximum 300 mm.
Can a rectangular slab have a two way action?
But rectangular slabs often have such proportions and supports (e.g., relatively deep, stiff monolithic concrete beams) that result in two-way action [Fig. 1.1(b)]. At any point, such slabs are curved in both directions resulting in biaxial bending moments.
What are the load combinations for one way slab?
One way slab is normally designed for gravity load only. The design load combinations are as follows ACI 318-99 U = 1.4D