Waist Slab Staircase Definition
The waist is the thickness of the structural slab of rcc stairs.
Waist slab staircase definition. The stair is either cast with the steps making one unit or it is created by beams holding the steps. Waist slab or stair slab it is a slab provided just below the going along the length of stair to ensure proper strength and serviceability to the the staircase. Use diameter bar 10 mm. Stair slabs which are continuous and constructed monolithically with their supporting slabs or beams can be designed for a bending moment of say fl 10.
M1 bar spacing depends on structural designing. The width of staircase is 1500 mm the thickness of landing is 150 mm and the waist thickness h is 150 mm. In this waist the steps rest. For better understanding assume that spacing is 8 inches.
The bottom surface of a stair slab. The inclined slab between 1st and 2nd landing. Waist slab for a staircase is probably more used as a slang not as a professional technical word. The steps of the staircase which stand on waist slab can be developed with bricks or concrete.
The intersection of the tread and the riser. Main reinforcement number one. A horizontal slab provided between two flights. Nominal cover c nom is 25 mm.
Refer following image for better understanding w represents waist slab. Waste slab is one which starts beneath the steps of stair so we can calculate its length. 33 3 of is 456. Waist slab for a staircase is probably more used as a slang not as a professional technical word.
Radiating or angular tapering steps. So by our opinion this word is used as a slang referring the minimum thickness of stair. With the floor slab. The imposed load is 2 5 kn m2 and finishes is 0 5 n m2.
This term refers to a slab of the stair that is slanting from the floor slab to the landing slab. However in many instances the stairs are precast or constructed after the main structure pockets with dowels being left in the supporting beams to receive the stairs and with no appreciable end restraint the design moment should be fl 8. It is made up of rcc or wood the waist is the minimum thickness perpendicular to the soffit of the staircase. Design of staircase.
Such a slab does not exist in reality. 1 8k views view 1 upvoter. The depth thickness of the waist is the least thickness perpendicular to the soffit of the staircase cl. The depth of the waist slab on which steps are built up is called as waist.
Design the staircase by using concrete grade 25 and strength of reinforcement of 500 n mm2. The least thickness of a stair slab. This can be imagined like a ramp not including the steps. This term refers to a slab of the stair that is slanting from the floor slab to the landing slab.
The vertical distance from a line connecting the nosings of all treads and the. Where f is the total ultimate load. Design the reinforcement for the stairs.
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