What Is Staircase | Staircase Design Calculation Example

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.

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

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.