What is the condition for two way slab?
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What is the condition for two way slab?
In two way slab, the load is carried in both directions. In two-way slab, the crank is provided in four directions. 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.
What is a slab detail?
Reinforcement detailing of a slab is done based on its support conditions. Slab may be supported on walls or beams or columns. Slab supported directly by columns are called flat slab. Slab supported on two sides and bending takes place predominantly in one direction only is called One Way Slab.
What is a two way slab design?
The two-way slab is a slab which is generally supported on all sides of walls or beams, and whose length to breadth ratio is less than two and it twists or bends in both direction while transferring the loads to the walls or beams.
What is the thickness of two way slab?
Moreover, the minimum thickness of any two way slab without interior beams should not be less than the following: For slabs without drop panel 125 mm. For slabs with drop panel 100 mm.
What is the span of a slab?
In structural engineering and architecture, ‘span’ is the term given to the length of a structural component – eg beam, floor, roof or floor truss – that extends (or ‘spans’) between two supports.
What are the type of two way slab?
Types of Two Way Slab: Two Way Flat Plates Slab. Two Way Flat Slabs. Two Way Waffle Plate Slab. Two Way Slab With Hollow Block.
What is the slab thickness?
In general, 6 inch (150mm) slab thickness is considered for residential and commercial buildings with reinforcement details as per design. Methods used for finding slab thickness varies for different types of slabs.
What is the %of minimum steel used in slab?
Detailed Solution. Explanation: The minimum percentage of reinforcement is 0.12% of the gross cross-sectional area if HYSD bars(Fe 415) are used. The minimum percentage of reinforcement is 0.15% of the gross cross-sectional area if mild steel bars are used.
What is the minimum thickness of slab?
1.3 Minimum thickness of Slab on the ground UBC recommends minimum thickness of Concrete floor slabs supported directly on the ground to be 89mm, whereas BCGBC4010A – Apply structural principles to residential low-rise constructions determined minimum thickness to be 100mm.
What is the advantages of two way slab?
Advantages: More efficient structural system than a flat plate, typically with lower stress concentration at column locations. Slabs are generally thinner in comparison to the flat plate solution. Absence of beams allows lower storey heights.
What is the normal thickness of slab?
In general, 6 inch (150mm) slab thickness is considered for residential and commercial buildings with reinforcement details as per design. Methods used for finding slab thickness varies for different types of slabs. For example, one-way slab thickness calculation is different and easier from that of two-way slab.
What is the development length?
A development length can be defined as the amount of reinforcement(bar) length needed to be embedded or projected into the column to establish the desired bond strength between the concrete and steel (or any other two types of material).
What is the minimum distance between two columns?
For ordinary structures, a distance of 5 m is appropriate, and the maximum span is 7.5, while the minimum is 2.5 m. It should be known that any distance between two columns can be used, provided that the structure’s safety and integrity are not endangered.
What is the minimum depth of slab?
Minimum thickness should not be less than 4.75 inches not forgetting the factor of safety. Standard concrete floor slab thickness in residential construction is 4 inches, five to six inches is recommended if the concrete will receive occasional heavy loads, such as mortar homes or garbage trucks.
Which mm rod is used for slab?
Bars smaller than 6 mm diameter or greater than 18 mm are not used for slabs. 10 mm or 12 mm plain M.S. bars or 8 mm or 10 mm tor-steel bars are generally used. They are provided at the bottom of the slab allowing minimum cover of 25 mm of concrete.
How far can a two-way slab span?
Economic Span Range: 5-8m (Conventional RC) 6-10m ( Post-Tensioned)
Which slab is better one way or two way?
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 are the steps to design a slab?
Assume an effective depth (d) on the basis of span to effective depth ratio (Table 1).
What is better, ribbed or solid slab one way?
Waffle slabs are used for larger span slabs or floors and used when there is limited requirement for number of columns.
Where are one way and two way slabs used?
This type is commonly used in a multi-storeyed building, where floors need to support the weight of additional floors. The best way to determine which type you need is to review the breadth and width of a particular project. If one direction is longer than the other by a ratio of two to one, then you should consider a one-way slab. 3. Kitchen Slab
