Calculation of Staircase Three 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

**A various part 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 going

• In **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 f**orms the face of the step, also forms the space between one step and the next.

• Rise provided could be uniform. It is normally **hight 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.**

**1. Concrete Calculation for Staircase**

**Staircase Reinforcement Details**

**Concrete calculation**

**Section 1**

Landing area concrete = **L x B x H**

Landing area concrete = **1.7 M. x 3.25 M. x 0.150 M**.

Landing area concrete =** 0.830 Cu.m.**——–**(1)**

**Section 2**

Wasit slab area concrete = **L x B x H x N**

Wasit slab area concrete = 3.85 M. x 1.5 m. x 0.150 M. x 2 Nos.

Wasit slab area concrete =** 1.732 Cu.m**. ——–**(2)**

**Section 3**

Steps area concrete =** L x Vloume of trianglar area x N x Q**

Steps area concrete = 1.5 M. x( 0.300 M. x 0.150 M x (1/2)) x 2 Nos. X 11 Qty

Steps area concrete = **0. 75 Cu.m.** ——–**(3)**

**Section 4**

Beam area concrete = **L x B x H X N**

Beam area concrete = 1.5 M. x 0.44 M. x 0.300 M. x 2 Nos.

Landing area concrete =**0.400 Cu.m.**——–**(4)**

Total Concrete of Staircase =** (1) + (2) + (3) + (4)**

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**

Landing Area **Bar Bending Schedule**

Distribution bar 8 mm C/C 120 mm Length 3.25 in Y-axis Distribution area 1.5m

So No, of 8 mm Steel bar = 1.5 M. / 0.120 M. = 12.5 Nos

Consider 13 Nos. steel bar use Top Side +13 Nos Steel use Bottom Side

Weight of distribution of 8 mm dia steel bar = **L x Nos of steel x Weight of Steel **

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)

Weight of distribution of 8 mm dia steel bar = **33.34 kg ——– (1)**

**Section 1 Total = 33.34 kg**

**Section 2-1**

Wasit slab **Bar Bending Schedule**

Distribution bar 8 mm C/C 140 mm Length 1.5 in Y-axis Distribution area 3.89m

So No, of 8 mm Steel bar = 3.89 M. / 0.140 M. = 27.75 Nos

Consider 28 Nos. steel bar use Top Side +28 Nos Steel use Bottom Side

Weight of distribution of 8 mm dia steel bar = **L x Nos of steel x Weight of Steel **

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)

Weight of distribution of 8 mm dia steel bar = **33.1 kg ——– (2-1-1)**

**Main bar Bottom Area 10mm dia C/c 80 mm distance **

**Length** of main bar bottom area = 1.5 M. – 0.180 M. + 0.150 M. + 3.89 M. + 0.450 M.

**Length** of main bar bottom area = 5.81 m

Nos of bar 10 mm dia C/c 80 mm distance = 1.5 M. / 0.080 M. = 18.75 Nos.

Consider 19 Nos. steel bar use Bottom bar Side

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)

Main bar Bottom Area 10mm dia steel bar =** 68.11 kg ——– (2-1-2)**

**Main bar Top Area 10mm dia C/c 80 mm distance **

**Length** of main bar top area = 1.7 M. – 0.180 M. + 3.89 M. + 0.450 M. +0.250 M.

**Length** of main bar top area = 6.11 m

Nos of bar 10 mm dia C/c 80 mm distance = 1.5 M. / 0.080 M. = 18.75 Nos.

Consider 19 Nos. steel bar use Bottom bar Side

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)

Main bar Bottom Area 10mm dia steel bar =** 71.63 kg ——– (2-1-3)**

**Section 2-1 total = 33.1 kg + 68.11 kg + 71.63 kg = 172.84 kg **

**Section 2-2**

**Wasit slab Bar Bending Schedule**

Distribution bar 8 mm C/C 140 mm Length 1.5 in Y-axis Distribution area 3.83m

So No, of 8 mm Steel bar = 3.83 M. / 0.140 M. = 27.75 Nos

Consider 28 Nos. steel bar use Top Side +28 Nos Steel use Bottom Side

Weight of distribution of 8 mm dia steel bar = **L x Nos of steel x Weight of Steel **

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)

Weight of distribution of 8 mm dia steel bar = **33.1 kg ——– (2-2-1)**

**Main bar Bottom Area 10mm dia C/c 80 mm distance **

**Length** of main bar bottom area = 1.5 M. – 0.180 M. + 0.150 M. + 3.83 M. + 0.450 M.

**Length** of main bar bottom area = 5.78 m

Nos of bar 10 mm dia C/c 80 mm distance = 1.5 M. / 0.080 M. = 18.75 Nos.

Consider 19 Nos. steel bar use Bottom bar Side

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)

Main bar Bottom Area 10mm dia steel bar =** 67.75 kg ——– (2-2-2)**

**Main bar Top Area 10mm dia C/c 80 mm distance **

**Length** of main bar top area = 1.7 M. – 0.180 M. + 3.83 M. + 0.450 M. +0.250 M.

**Length** of main bar top area = 6.05m

Nos of bar 10 mm dia C/c 80 mm distance = 1.5 M. / 0.080 M. = 18.75 Nos.

Consider 19 Nos. steel bar use Bottom bar Side

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)

Main bar Bottom Area 10mm dia steel bar =** 70.92 kg ——– (2-2-3)**

**Stection 2-2 Total = 31.1 kg + 68.09 kg +70.92 kg = 170.11 kg**

**Total Secction 2 weight = 172.84 kg + 170.11 kg = 342.95 kg**

**Section 3**

Beam area bar bending schedule

8mm dia Ring Size for lenth of column ring = Column Size – Cover

Ring Size for lenth of column ring = ( L of Column – cover – cover + B of Coumn – cover – cover + Hook ) x 2

Ring Size for lenth of column ring = (600 -25 -25 + 300 – 25 -25 +8 ) x 2

8mm dia Ring Size for lenth of column ring = 1.616 M.

**Staircase Reinforcement Details**

No ring requirement = Length / Spacing

No ring requirement = 1.5 /0.140 = 11 Nos

Weight of ring = 1.616 x 11 x 0.395 = **7.02 kg** ——–**(3-1)**

Length of Bar = Length of bar +( wall bering + wall bering ) + ( End side L Bend x No of Qty )

12 mm dia Length of Bar = 1.5 + (0.200 + 0. 200 ) + (0. 300 X 4)

Length of Bar = 3.1 M.

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)

**Section 3 total = 7.02 kg + 16.554 kg = 23.57 kg x 2 ( Beacuse of same two beam ) = 47.51 kg**

Total Weight of Staircase Bar Bending secdule

= **Section 1 + Section 2 + Section 3 **

**= 33.34 kg + 342.95 kg + 47.51 kg**

**Total Weight of Staircase Bar Bending secdule = 423.79 kg**

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