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**What is the Bar Bending Schedule ? How to prepare a Bar Bending Schedule.**

Bar bending schedule or schedule of bar is defined as tabular representation of reinforcement bar.

Bar bending schedule is useful to identify requirements of different length of bars and sizes of bars and also helpful to arrange and bent-up the bars during time of construction at site.

Bar bending schedule (BBS) represents the details of bars, shape of bars, total length of bars, number of bars and weight of bars.

Bar bending schedule (BBS) or Schedule of bar is normally prepared during time of Estimating RCC work.

**Advantages of Bar Bending Schedule (BBS) in construction.**

- Bars Bending Schedule (BBS) provides proper estimation of reinforcement used in every RCC member.
- We can calculate the overall reinforcement steel requirement for the construction project.
- Bars Bending Schedule (BBS) is useful for the engineer in the purchase of steel and proper stock management at site.
- Bar Bending Schedule gives the proper quantity of steel reinforcement requirement in construction projects. So by taking good supervision of contractors, we can decrease wastage of steel reinforcement.
- Bar Bending Schedule helps site engineers or quality engineers to check and identify reinforcement work for proper quality management.
- Billing can be done fast and easily using a bar bending schedule (BBS).

**How to prepare a Bar Bending Schedule (BBS).**

Generally Bar Bending Schedule (BBS) is prepared to calculate the quantity of steel used in RCC (Reinforced Cement Concrete). Normally Qty of Steel is very small in volume so there is not required to be deducted from the volume of concrete.

Steel Quantity is calculated as per actual length of bar, overlap in reinforcement, Hook in bar etc and is found from detailed drawing available at site.

Percentage of steel are different for various elements of building as given below

Elements of Building Structure |
Percentages |

Slab | 0.7 to 1.0 % |

Beam | 1 to 2 % |

Column | 1 to 5 % |

Footing | 0.5 to 0.8 % |

**Extra Length of Reinforcement Bar :**

- 180˚ Bend Hook

- Extra Length for 1 hook = 9Ø
- Extra Length for 2 hook = 2 x 9Ø = 18Ø
- Where, Ø = Diameter of Bar

- 90˚ Bend Hook

- 90˚ Bend Hook is generally provided for HYSD (High Yield Strength Deformed) bars.
- Extra Length for 1 hook = 6Ø
- Extra Length for 2 hook = 2 x 6Ø = 12Ø
- Where, Ø = Diameter of Bar

- Bent up Bars

- Extra Length for one Bent up bar = 0.42d
- Extra Length for two Bent up bar = 2 x 0.42d = 0.84d
- Where, d = D – (top cover + bottom cover)
- Where, D = Overall Depth of Slab

- Two Legged Stirrups :

- Extra length of hook = 24Ø
- A = b – 2 (side cover of beam)
- B = D – (top cover + bottom cover)
- Total length of stirrups = 2(A+B) + 24Ø
- Where, Ø = Diameter of bar

**Weight of Reinforced Bars :**

- Weight of bar is calculated in kg per metre length of bar. We can understand in unit is kg/m.
- Weight of bars (kg/m) = Ø
^{2}/162 - Where, Ø = Diameter of Bar

**Calculation of Number of Bars :**

- Number of Bars = Span/Spacing + 1

**FAQs on Bar Bending Schedule**

#### How do you calculate bend bar?

Extra Length for Bent up Bars Extra Length for one Bent up bar = 0.42d Extra Length for two Bent up bar = 2 x 0.42d = 0.84d Where, d = D – (top cover + bottom cover) Where, D = Overall Depth of Slab

#### What is the lap length of a bar bending schedule?

As per practical experience, we can take lap length 50d for both beams and columns. where, d = dia of reinforcement bar.

#### How do you calculate bar formula?

Weight of bar is calculated in kg per metre length of bar. We can understand in unit is kg/m. Weight of bars (kg/m) = Ø2/162 Where, Ø = Diameter of Bar

#### What is 7850 in steel?

The unit weight (kg per cu.mt) of a mild steel plate or rolled steel is appx. 7850 kg/m3.

#### What is the full form of TMT bar?

The full form of TMT bar is Thermo Mechanically Treated Bar.

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