What Is Staircase | Staircase Design Calculation Example | Concrete Calculation of Staircase

What Is Staircase?

Staircase, series, or flight, of steps between two floors. Traditionally, the staircase is a term for stairs accompanied by walls, but contemporary usage includes the stairs alone.

How to Calculate Number of Riser and Tread for a Staircase Steps?

Requirement of Staircase Calculation.

• Hight of Staircase.
• Length of Staircase.
• Maximum height of riser should be 150 mm (150 mm to 200 mm)
• Minimum tread length should be 300 mm (250 mm to 300 mm)
• Length of the step should be a minimum of 1000 mm
• Handrail height should be a minimum of 1000 mm.
• Width of the landing slab will be at least 1000 mm for the walkover on the staircase.

Also, read: Type of Stair | Stairs Parts Names & Details

Staircase Design Calculation Example

Now we are going to calculate the required number of Riser and Tread for a Dog legged staircase having

• 1 Meter Width of Landing Slab
• 3 Meter Height
• 4 Meter Width
• Middle Slab Highet 1.5 m

Staircase Dimension Calculation Formula

• Number of Tread = Length of Stair/One number of Tread
• Number of Riser = Height of Staircase/ Height of one number of Riser

From the above Diagram,

The staircase has divided into two flights providing a landing slab at mid of the staircase height.

• So Number of Riser = Height of Staircase / Height of one Rise
• Number of Riser = 1500/150
• Number of Riser = 10 Nos
• So as per standard, we are providing 300 mm as tread length.
• Number of Tread  = Length of Stair/One number of Tread
• Number of Tread  = 3000/300
• Number of Tread  = 10 Nos
• Hence the required number of Riser and Tread is 10 Nos.
• Total No Staircase of = Below landing + Above landing
• Total No Staircase of = 10 Nos + 10 Nos = 20 Nos of Stire required to achieve 3 m hight

Also, read: How to Calculate Staircase | Concrete & Bar Bending Schedule (BBS) | Staircase Reinforcement Details

Concrete Calculation of Staircase

Section 1

• Landing area concrete = L x B x H
• Landing area concrete = 1.0 m.  x 2.0 M. x 0.150 M.
• Landing area concrete = 0.3 Cu.m.——–(1)

Section 2

• Waist Slab Laenght = (a²+b²)= c²
• C = Lenght of Waist slab
• A = Hight of Landing Slab
• B = Breadth of Wasit slab
• Waist Slab Laenght = (1.5²+3.0²)= c²
• Waist Slab Laenght = c =√(11.25)
• Waist Slab Laenght = c =3.35 m
• Wasit slab area concrete = L x B x H x N
• Wasit slab area concrete = 3.35 m. x 1.5 m. x 0.150 m. x 2 Nos.
• Wasit slab area concrete = 1.501 Cu.m. ——–(2)

Section 3

• Steps area concrete = L x Volume of triangular area x N x Q
• Steps area concrete = 1.0 m. x ( 0.300 m. x 0.150 m x (1/2)) x 2 Nos. X 10 Qty
• Steps area concrete = 0. 45 Cu.m. ——–(3)
• Total Concrete of Staircase = (1) + (2) + (3) 
• Total Concrete of Staircase = 0.30 Cu.m. + 1.501 Cu.m. + 0. 45 Cu.m. 
• Total Concrete of Staircase = 2.251 Cu.m.