What is Staircase | Staircase Design Calculation | Concrete Calculation of Staircase

What is Staircase?

Stairs are used to move from floor to floor. Stairs allow access and communication between floors in multi-story buildings. The room or space between which a stair is located is known as the staircase.

It should therefore be covered with fire-resistant walls, floors, roofs and doors. It should be designed to carry certain loads used for the design of floors. Various materials such as wood, brick, stone, steel or reinforced cement concrete can be used for stair construction.

Thumb Rules for Staircase Design Calculation:

Important points to consider when planning the staircase design calculation:

1. Width of Stair: It should not be less than 1 m.
2. Length of flight: The number of steps in a single flight should not be more than 12.
3. Pitch of the stair: It should be between 25 to 40
4. Width of landing: It should be 150mm, more than the width of stair.
5. Length of Step: The length of the step should be at least 600 mm.
6. Winders or kite steps: Odd shaped steps should be avoided and incase found necessary. These should be provided at the start of a stair.
7. Han-rails: It should be 750 to 850 mm in height from the top of respective step or landing.
8. Step proportions: The size of rise and tread in a stair should be kept uniform through out the whole stair.
9. Headroom: Minimum of 2000mm of clear headroom is required above the pitch line
10. Following proportions are recommended:

• Generally: Riser (150 mm to 200 mm) , Tread (250 mm to 300 mm)
• Residential buildings: Tread=250 mm, Riser = 160mm
• Public buildings: Tread=300 mm, Riser= 150mm
• Industrial buildings, Railway station, etc: Tread = not less then 250 mm (250 to 300 mm) , Riser = not less then 150 mm (150 to 190 mm)

1. Otherwise work out the sizes of rise and tread by using any one of the following proportions:

• (2 x Rise) + (Going), In mm = 550 to 600 mm
• Rise x tread, both in cm = 400 to 410 cm2.
• With basic proportion of going 300 mm and rise 150 mm, add 10 mm to rise for every 20 mm deduction from going e.g. For a going of 280 mm the rise will be 160 mm.

The above rules act as guide but the actual sizes depend upon the availability of space, while planning stairs practical-field.

How to Calculate Number of Riser and Tread for a Staircase Steps | Stair Calculation Formulas:

In this example we will take a Floor to Floor level of 2800mm / 2.80m (Total Rise).

1. Consider the Size of Riser:

2. Consider the Size of Tread:

3. Calculate the Number of Risers:

4. Calculate the Number of Treads:

5. Calculate the Width of Run:

6. Calculate the Angle of Stair:

7. Calculate Step Length | Stair Formula 2R+t:

Final Data: Thumb Rules for Staircase:

1. Size of Rizer = 200 mm
2. Size of Tread = 275 mm
3. Total Number of Risers = 14 Nos
4. Total Number of Treads = 13 Nos
5. Width of Total Run = 3850 mm
6. Angle of Stair = 36 Degree

Concrete Calculation of Staircase:

To be Continue… For all formulas of staircase design please Full Article here: Thumb Rules for Staircase Design Calculation | Concrete Calculation of Staircase

Thumb Rules for Staircase Design Calculation | Concrete Calculation of Staircase