Calculation and Bar Bending Schedule for Staircase Construction

Calculation of Staircase two Different Parts as Below

1. Concrete Calculation for Staircase
2. Bar Bending Schedule for Staircase

First, start the calculation of staircase sum basic knowledge of staircase

Parts of Stairs Parts Names & Details

A various Parts of Stair:

Step:

A flat surface, especially one in a series, on which to place one’s foot when moving from one level to another. all step is composed of tread and riser.

Tread:

Tread is a scrap of the stairway that’s stepped in. It’s the top or flat surface to press beneath the feet. It’s trodden on while climbing or descending the staircase.

It’s constructed to the same thickness as another floor. There’s always one fewer tread than risers at stairs. The general horizontal distance of the stairs is going to be the number of threads added together.

The horizontal projection of a step in a staircase is called tread. It is also known as goingIn residential buildings, the tread length provided is 250 mm while in public buildings maximum length 270 mm to 300 mm.

Riser:

This riser is the vertical portion between each tread on the stair. Not all stairs have risers. The rise-less steps are called the open thread.

Open riser stairs have grown in popularity Recently years. Closed tread stair has risers included. This vertical board forms the face of the step, also forms the space between one step and the next.

Rise provided could be uniform. It is normally hight at 150 mm to 175 mm in residential buildings while it is kept between hight 120 mm to 150 mm in public buildings.

However, in commercial buildings, more rise is provided from the consideration of the economic floor area.

Nosing:

Nosing is the flat protruding edge of a stair at which most foot traffic occurs. Mostly, it’s the half curved molding fixed into the ends of those threads exposed at a half that covers where the balusters fit into the treads.

Nosing is the border of the tread projecting beyond the face of the riser and the face of a cut string. This is the place where the thread above a riser overhangs it. Sometimes, the tread may not have a nosing.

Base Rail or Shoe Rail

For systems in which the baluster doesn’t start at the treads, they go to a base rail. This allows for identical balusters, avoiding this second baluster problem.

Landing:

This is a platform provided between two flights.

How to Calculate Staircase Qty?

Here we are going to calculate the Qty of Staircase. We will divide the amount of stairs into two parts. In the first part we will calculate the concrete, then we will calculate all the steel.

1. Concrete Calculation for Staircase
2. Bar Bending Schedule for Staircase

Let’s go into detail knowledge of Calculate Staircase Qty.

1. Concrete Calculation for Staircase

Staircase Reinforcement Details

Concrete Calculation

Section 1: Concrete Calculation For Staircase

1. Landing area concrete = L x B x H
2. Landing area concrete = 1.7 M.  x 3.25 M. x 0.150 M.
3. Landing area concrete = 0.830 Cu.m.——–(1)

Section 2: Concrete Calculation For Staircase

1. Wasit slab area concrete = L x B x H x N
2. Wasit slab area concrete = 3.85 M. x 1.5 m. x 0.150 M. x 2 Nos.
3. Wasit slab area concrete = 1.732 Cu.m. ——–(2)

Section 3: Concrete Calculation For Staircase

1. Steps area concrete = L x Vloume of trianglar area x N x Q
2. Steps area concrete = 1.5 M. x( 0.300 M. x 0.150 M x (1/2)) x 2 Nos. X 11 Qty
3. Steps area concrete = 0. 75 Cu.m. ——–(3)

Section 4: Concrete Calculation For Staircase

1. Beam area concrete = L x B x H X N
2. Beam area concrete = 1.5 M. x 0.44 M. x 0.300 M. x 2 Nos.
3. Landing area concrete =0.400 Cu.m.——–(4)
4. Total Concrete of Staircase = (1) + (2) + (3) + (4)
5. Total Concrete of Staircase = 0.830 Cu.m. + 1.732 Cu.m. + 0. 75 Cu.m. + 0.400 Cu.m.

Total Concrete of Staircase = 3.712 Cu.m.

2. Bar Bending Schedule for Staircase

Staircase Reinforcement Details

Section 1: Steel Calculation For Staircase

1. Landing Area Bar Bending Schedule
2. Distribution bar 8 mm C/C 120 mm Length 3.25 in Y-axis Distribution area 1.5m
3. So No, of 8 mm Steel bar = 1.5 M. / 0.120 M. = 12.5 Nos
4. Consider 13 Nos. steel bar use Top Side +13 Nos Steel use Bottom Side
5. Weight of distribution of 8 mm dia steel bar = L x Nos of steel x Weight of Steel 
6. Weight of distribution of 8 mm dia steel bar = 3.25 x 13 x 2 x 0.395               (0.395 kg/m is 8mm dia steel bar weight)
7. Weight of distribution of 8 mm dia steel bar = 33.34 kg ——– (1)
8. Section 1 Total = 33.34 kg

Section 2-1: Steel Calculation For Staircase

1. Wasit slab Bar Bending Schedule
2. Distribution bar 8 mm C/C 140 mm Length 1.5 in Y-axis Distribution area 3.89m
3. So No, of 8 mm Steel bar = 3.89 M. / 0.140 M. = 27.75 Nos
4. Consider 28 Nos. steel bar use Top Side +28 Nos Steel use Bottom Side
5. Weight of distribution of 8 mm dia steel bar = L x Nos of steel x Weight of Steel 
6. Weight of distribution of 8 mm dia steel bar = 1.5 x 28 x 2 x 0.395               (0.395 kg/m is 8mm dia steel bar weight)
7. Weight of distribution of 8 mm dia steel bar = 33.1 kg ——– (2-1-1)
8. Main bar Bottom Area 10mm dia C/c 80 mm distance 
9. Length of main bar bottom area = 1.5 M. – 0.180 M.  + 0.150 M. + 3.89 M. + 0.450 M.
10. Length of main bar bottom area = 5.81 m
11. Nos of bar 10 mm dia C/c 80 mm distance = 1.5 M. / 0.080 M. = 18.75  Nos.
12. Consider 19 Nos. steel bar use Bottom bar Side
13. Main bar Bottom Area 10mm dia steel bar = 5.81 M. X 19 Nos. X 0.617 kg/m               (0.617 kg/m is 10mm dia steel bar weight)
14. Main bar Bottom Area 10mm dia steel bar = 68.11 kg ——– (2-1-2)
15. Main bar Top Area 10mm dia C/c 80 mm distance 
16. Length of main bar top area = 1.7 M. – 0.180 M.  + 3.89 M. + 0.450 M. +0.250 M.
17. Length of main bar top area = 6.11 m
18. Nos of bar 10 mm dia C/c 80 mm distance = 1.5 M. / 0.080 M. = 18.75  Nos.
19. Consider 19 Nos. steel bar use Bottom bar Side
20. Main bar Top Area 10mm dia steel bar = 6.11 M. X 19 Nos. X 0.617 kg/m               (0.617 kg/m is 10mm dia steel bar weight)
21. Main bar Bottom Area 10mm dia steel bar = 71.63 kg ——– (2-1-3)
22. Section 2-1  total = 33.1 kg + 68.11 kg + 71.63 kg = 172.84 kg 

Section 2-2: Steel Calculation For Staircase

1. Wasit slab Bar Bending Schedule
2. Distribution bar 8 mm C/C 140 mm Length 1.5 in Y-axis Distribution area 3.83m
3. So No, of 8 mm Steel bar = 3.83 M. / 0.140 M. = 27.75 Nos
4. Consider 28 Nos. steel bar use Top Side +28 Nos Steel use Bottom Side
5. Weight of distribution of 8 mm dia steel bar = L x Nos of steel x Weight of Steel 
6. Weight of distribution of 8 mm dia steel bar = 1.5 x 28 x 2 x 0.395               (0.395 kg/m is 8mm dia steel bar weight)
7. Weight of distribution of 8 mm dia steel bar = 33.1 kg ——– (2-2-1)
8. Main bar Bottom Area 10mm dia C/c 80 mm distance 
9. Length of main bar bottom area = 1.5 M. – 0.180 M.  + 0.150 M. + 3.83 M. + 0.450 M.
10. Length of main bar bottom area = 5.78 m
11. Nos of bar 10 mm dia C/c 80 mm distance = 1.5 M. / 0.080 M. = 18.75  Nos.
12. Consider 19 Nos. steel bar use Bottom bar Side
13. Main bar Bottom Area 10mm dia steel bar = 5.78 M. X 19 Nos. X 0.617 kg/m               (0.617 kg/m is 10mm dia steel bar weight)
14. Main bar Bottom Area 10mm dia steel bar = 67.75 kg ——– (2-2-2)
15. Main bar Top Area 10mm dia C/c 80 mm distance 
16. Length of main bar top area = 1.7 M. – 0.180 M.  + 3.83 M. + 0.450 M. +0.250 M.
17. Length of main bar top area = 6.05m
18. Nos of bar 10 mm dia C/c 80 mm distance = 1.5 M. / 0.080 M. = 18.75  Nos.
19. Consider 19 Nos. steel bar use Bottom bar Side
20. Main bar Top Area 10mm dia steel bar = 6.05 M. X 19 Nos. X 0.617 kg/m               (0.617 kg/m is 10mm dia steel bar weight)
21. Main bar Bottom Area 10mm dia steel bar = 70.92 kg ——– (2-2-3)
22. Stection 2-2 Total =  31.1 kg + 68.09 kg +70.92 kg = 170.11 kg
23. Total Secction 2 weight = 172.84 kg + 170.11 kg = 342.95 kg

Section 3: Steel Calculation For Staircase

1. Beam area bar bending schedule
2. 8mm dia Ring Size for lenth of column ring = Column Size – Cover
3. Ring Size for lenth of column ring  = ( L of Column – cover – cover + B of Coumn – cover – cover + Hook ) x 2
4. Ring Size for lenth of column ring = (600 -25 -25 + 300 – 25 -25 +8 ) x 2
5. 8mm dia  Ring Size for lenth of column ring = 1.616 M.

Staircase Reinforcement Details

1. No ring requirement = Length / Spacing
2. No ring requirement = 1.5 /0.140 = 11 Nos
3. Weight of ring  = 1.616 x 11 x 0.395 = 7.02 kg ——–(3-1)
4. Length of Bar = Length of bar +( wall bering + wall bering ) + ( End side L Bend x No of Qty )
5. 12 mm dia Length of Bar = 1.5 + (0.200 + 0. 200 )  + (0. 300 X 4)
6. Length of Bar = 3.1 M.
7. Weight of ring Main bar  = 3.1 x 6 x 0.89 = 16.554 kg ——–(3-2)               (0.89 kg/m is 12mm dia steel bar weight)
8. Section 3 total = 7.02 kg + 16.554 kg = 23.57 kg x 2 ( Beacuse of same two beam ) = 47.51 kg
9. Total Weight of Staircase Bar Bending secdule

Section = Section 1 + Section 2 + Section 3 

Section = 33.34 kg + 342.95 kg + 47.51 kg

Total Weight of  Staircase Bar Bending secdule  = 423.79 kg.

FAQ: Staircase Construction

What are the essential components of a staircase?

A staircase consists of various components including steps (composed of tread and riser), landing, nosing, base rail or shoe rail, and sometimes a waist slab for support.

How do you calculate the concrete required for a staircase?

The concrete calculation involves determining the area of each section of the staircase, such as the landing, waist slab, steps, and beams, and then summing them up. Each section’s area is calculated based on its dimensions (length, width, and height).

What is a bar bending schedule, and why is it important for staircase construction?

A bar bending schedule details the reinforcement steel required for the staircase. It includes information about the type, size, spacing, and length of steel bars needed for various sections of the staircase. It’s crucial for ensuring structural integrity and durability.

How is the steel quantity calculated for staircase reinforcement?

Steel quantity is calculated by considering factors such as the spacing of distribution bars, diameter and spacing of main bars, length of bars, and the number of bars needed for each section of the staircase. The weight of steel is then determined based on these parameters.

Why is it important to accurately calculate the concrete and steel quantities for staircase construction?

Accurate calculations ensure that the staircase is structurally sound, meets safety standards, and can withstand the intended load and usage. Proper concrete and steel quantities also help in budgeting and material procurement, minimizing wastage and cost overruns.

Are there any specific regulations or standards to follow when designing a staircase?

Yes, building codes and regulations often specify requirements for staircase design, including dimensions, materials, safety features, and load-bearing capacity. It’s essential to adhere to these standards to ensure compliance and safety.