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.



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