Monday, September 25, 2023

# Staircase Calculator

### 1. Staircase Calculator

Before executing the calculator, read all standard sizes of Tread and Rise given below:

### 2. Staircase Design Formulas

Before entering the design of the staircase, there are several criteria or you can formulas that should be known.

a. Relation Between Riser and Tread

 T+2R= 600 mm

b. Standard Values:

The design of the staircase should build it within the limit of government policies. So, always be aware while assuming the value of tread and riser.

a. For Residential Building: T = (220 – 270) mm, R= (150 – 170) mm

b. For Public Building: T = (250-300) mm, R= (100-150) mm

 Country Tread (mm ) Rise (mm) India Residential Building 200-250 190 to 200 Commercial Building 300 150 to170 United States 279 (Minimum) 240 (Minimum) Philippines 750 200 Malaysia 260-370 140-190 Nepal Residential Building 220 – 270 150 – 170 Public Building T= 250-300 R= 100-150

c. Usual Sizes of steps

a. For Residential Buildings: (150 x 270) mm to (170 x 220)mm

b. For Public Building: (100 x 300) mm to (150 x 250) mm

d. Types of Staircases:

a. Public Building = Open well staircase

b. Residential Building = Dog-legged Staircase

 Total Length of stair = NTxT+L+E

Where,

L= Landing

E= Entry Space

 Number of treads (NT) = NR-1

Where,

NR = Number of Riser

### 3. Numericals of Staircase Design

1. Draw a plan of a dog-legged staircase for a building in which the vertical distance between floors is 3.6 m. The stair hall measures 2.5 m x 5m.

Given,

Floor Height = 3600 mm

Types of staircase = Dog Legged staircase

Assume,

Riser (R)= 150 mm

Number of risers (NR) = 3600 / 150 = 24 nos

Number of Riser in One Flight = 24/2 = 12 nos

Number of Tread in one Flight = 12-1 = 11 nos

Now,

T+2R = 600

T + 2×150= 600

T= 600-300

T= 300 mm

Size of tread = 300 mm

Width of stair = 1200 mm

Size of Landing = Width of stair = 1200 mm

Entry Space(E) = 5000-1200-11×300 = 500 mm

Here, is our design of staircase.

2. Design a proper layout of an RCC Stair for a hospital that consists of the ground floor and first floor from the following data.

Inside Dimensions of staircase = 6m x 4.5 m

Height of each floor = 3.75 m

The thickness of the floor slab= 150 mm

Height of stair cabin = 2.50 m

Width of stair= 1.5 m

Solution,

Total Floor Height = 3750+150 = 3900 mm

Types of Staircase = Open well Staircase

Assume,

Riser (R) = 150 mm

Total Number of riser = 3900/150 = 26 nos

Now,

T+2R= 600

T= 600- 2×150

T= 300 mm

Also, the width of the stair = 1500 mm

Landing of stair = 1500 mm

Here provide 9 treads in the First Flight, 5 treads in the second flight, and 9 treads in the third flight.

Entry Space (E) = 6000-1500-9×300 =1800 mm

Here, is our design of the staircase.

He is a founder and lead author of Dream Civil International and his civil engineering research articles has been taken as source by world's top news and educational sites like USA Today, Time, The richest, Wikipedia, etc.
Latest Articles

Related Articles