STAIR CASE DETAILS

STAIR CASE DETAILS

Stair is sets of steps which allow us to move basically from one floor to another floor. It is a essential part of building mostly constructed inside home. In this blog I will give a clear over view about stair.

First of all we need to know the technical term of stair part.

PARTS

1. Trade :- Trade is the horizontal portion of a step where we can stand.


stairs

2. Riser :- Riser is the vertical distance between two steps.


3. Flight :- Inclined Plane with no of steps allow some vertical distance.

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4. Landing :- A platform for rest or change direction, stated end and starting point of a flight.


5. Waist :- The thickness of flight without steps is called waist.

civil engineering

6. Handrail :- The holding rail allover the stair is called handrail.

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7. Run :- The length of stair in horizontal plane is called run.

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8. Pitch :- The slope of stair is called pitch




CLASSIFICATION OF STAIR 


Stair are classified as per their design in various type. A brief discussion is given.

1. Straight Flight Stair :- This stair runs in one direction. All steps include in a single flight.

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2. Dog-Legged Stair :- In this stair there are two flights runs in opposite direction with an intermediate landing. Length of flights are same but no open space between the flight.

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3.Quarter Turn Stair :- This stair two flights runs at 90 degree with an intermediate landing. Length of flights are not equal or may varies.

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4.Half Turn Open Well Stair :- This is similar to dog legged, but main difference is some space is considered between two flight and thus create a well type structure.

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5. 2-Quarter Turn Stair :- In this type there are 3 flights each runs at 90 degree with 2 intermediate landing.

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6. Circular or Spiral Stair :- This stair consist one flight and shaped like Spiral in elevation view and circular in plan view.


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7. Bifurcated Stair :- This stair also consist three flights in a order that two flights run opposite or at 180 degree with a intermediate landing and another flight runs at 90 degree angle with same intermediate landing.

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CONSIDERED VALUE 


According to building bylaws some values are considered for stair construction. These are-

1.Trade :-                                          150 mm to 200 mm or 6 in to 8 in
2.Riser :-                                           250 mm to 300 mm or 10 in to 1 ft.
3.Landing :-                                      900 mm to 1200 mm or 3 ft to 4 ft.
4.Flight Slab Thickness :-               125 mm to 150 mm or 5 in to 6 in.
5.Minimum width of Flight :-         900 mm to 1500 mm or 3 ft to 5 ft
6.Minimum Head Room Height :- 1500 mm to 2100 mm or 5 ft to 7 ft

RELATION BETWEEN RISER AND TRADE


On an average a relation between Riser and Trade is - Riser = 66/ Trade ( in FPS)

STEPS CALCULATION


Let suppose height between the floor is 3.45 m

Number of steps :- Let Riser height = 150 mm. Total Riser height is (3.45 - 150 mm -150 mm ) = 3.15 m. (150 mm is for floor slab and landing slab).
Now the no of steps = 3.15 m / 150 mm = 3.15/0.15 = 21 nos

For equal no of Steps in each flight provided no of steps is 20 .
Therefore the actual Riser = 3.15/20 = 0.1575 m or 157.5 mm.

 Dimension of Service Lift :-
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Conclusion :-   Here I discuses about stair case quite widely. Please support me to shear this blog if my knowledge helps you a little bit.Thanks.



Comments

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  4. sharanskFebruary 11, 2023 at 3:57 PM

    Thank you for sharing this blog. This blog explains architects' related information. Thank you for sharing your experience in design and construction. The information about the staircase construction and calculation is really good. Building Contractors in Hyderabad who is good at architectural services and also provide construction and design related information

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  5. Divya ManoharMarch 2, 2023 at 3:39 PM

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