**Basics of Bar Bending Schedule Formula | BBS Step by Step Preparation | BBS formulas | Cutting Length Formula | Reinforcement Calculation Excel**

In this Article today we will talk about the **What is Bar Bending Schedule | Basics of Bar Bending Schedule Formulas | BBS Formulas | Reinforcement Calculation Excel | Cutting Length Formula**** |** **How to Make Bar Bending Schedule | Bar Bending Schedule Calculation Formulas**

**What is Bar Bending Schedule (BBS) ?**

**Bar Bending Schedule** is a process of Cutting and Bending of Reinforcement bar into required shape. And making it’s list which describes:

- Location & Marking of Bar
- Type of Bar
- Size of Bar
- Cutting Length of Bar
- Number of Bar
- Bending Detail of Bar
- Total Quantity

of each bar in a reinforcement drawing of a structure. This process of listing is called **Scheduling.**

**Basics of Bar Bending Schedules Formulas | BBS Formulas:**

**Diameter of Reinforcement Bars in MM:**

**Standard Length of Bar in Meter:**

**Diameter of Reinforcement Bars in Inches/No’s:**

**Standard Length of Bar in Feet:**

**Weight of Bar Per Meter (Kg/m) Formula:**

Diameter of Bar (mm) | Unit weight in kg/m |

8 | 0.395 |

10 | 0.617 |

12 | 0.889 |

16 | 1.580 |

20 | 2.469 |

25 | 3.858 |

32 | 6.321 |

40 | 9.877 |

**Weight of One Bar in Kg/Bar Formula:**

**Weight of Bar Per Feet (Kg/ft) Formula:**

**Weight of One Bar in Kg/Bar Formula:**

**Cutting Length of Main Bar with Hook Formula:**

Where, L = Span – (Conc. Cover x 2), Note: **Hook Length** in Stirrups should be **10d** or 75mm, where **d** is dia of bar.

**Cutting Length of Main Bar with Bend Formula:**

Where, L = Span – (Conc. Cover x 2), if you need bend deduction then you should deduct **4d (2d + 2d)** for two **90 Deg** bends from main bar cutting length.

**Overlapping | Formula :**

**Concrete Cover or Clear Cover in Reinforcement:**

**Clear Cover for:**

- Footing: 50mm
- Column: 40mm
- Beam: 25mm
- Slab: 20mm
- Staircase: 15mm
- Chajja: 15mm
- Pile: 60mm
- Pile Cap: 60mm

**Spacing in Reinforcement:**

**Number of Bars:**

**Number of Stirrups Formula:**

**Bend Deduction in Bar Bending Formula:**

Bend increases the length of bar. So we need lesser length than we see in the drawing. So **cutting length** is taken less then the required length:

**Cutting Length of Crank or Bent Up Bar Formula:**

**Bend Deduction:** If you need bend deduction then you should deduct **4d (1d + 1d + 1d + 1d)** for four **45 Deg** bends from **crank or bent up bar** cutting length.

**Cutting Length of Rectangular Stirrups Formula:**

**Bend Deduction:** If you need bend deduction then you should deduct **6d (2d + 2d + 2d) for** three **90 Deg **bends** & 6d (3d + 3d)** for two **135 Deg** hook bends from **rectangular stirrup** cutting length.

**Cutting Length of Open-Loop Rectangular Stirrups Formula:**

**Cutting Length of Triangular Stirrups Formula:**

**Bend Deduction:** If you need bend deduction then you should deduct **12d (3d + 3d + 3d + 3d) for** four **135 Deg **bends from **triangular stirrup** cutting length.

**Cutting Length of Circular Stirrups Formula:**

**Bend Deduction:** If you need bend deduction then you should deduct **6d (3d + 3d)** for two **135 Deg **hook bends from **circular stirrup** cutting length.

**Cutting Length of Diamond Stirrups Formula:**

**Bend Deduction:** If you need bend deduction then you should deduct **6d (2d + 2d + 2d) for** three **90 Deg **bends** & 6d (3d + 3d)** for two **135 Deg** hook bends from **diamond stirrup** cutting length.

**Cutting Length of Spiral or Helix Stirrups Formula:**

**Bend Deduction:** If you need bend deduction then you should deduct **6d (3d + 3d)** for two **135 Deg **hook bends from **spiral ring** cutting length.

**Cutting Length of Chair Bar Formula:**

**Bend Deduction:** If you need bend deduction then you should deduct **8d (2d + 2d + 2d) for** four **90 Deg **bends from **chair bar** cutting length.

**Cutting Length of Trapezoidal Stirrup Formula:**

**Cutting Length of Shear Key Bar or Stirrup Formula:**

**Cutting Length of Haunch Bar Formula:**

**Cutting Length of Haunch Bar = S + Y + S** (Where S is given as lap)

As we Know that

Y = X / Cos 45

X = (Thickness of wall – Slab Cover) + (Haunch Size) + (Wall Thickness without covers – Z)

Where, Z = Cover – B

B = A / Cos 45 A

we can find the A by using Pythagoras theorem Hyp** ^{2}** = Base

**+ Perp**

^{2}

^{2}For More detail please see the Mathematical Example

**Bend Deduction:** If you need bend deduction then you should deduct 2**d (1d + 1d)** for two **45 Deg** bends from **haunch bar** cutting length.

**Cutting Length of Bracket Bar Formula – Case 1:**

**Cutting Length of Bracket Bar Formula – Case 2:**

**Cutting Length of Four Legged Stirrups Formula:**

**Cutting Length of Six Legged Stirrups Formula:**

For Calculating the Cutting Length of Stirrups, First of all we convert the stirrups in three parts (Stirrups 1, Stirrups 2, Stirrups 3)

**Cutting Length of 6-Leggeed Stirrups = Length of Stirrups 1 + Length of Stirrups 2 + Length of Stirrups 3**

**Cutting Length of Stirrups 1:**

**Cutting Length Formula for Stirrup-1:**

**= [(2nos × a1) + (2nos. × b1) + (2nos. × hook length) – {(3nos. × 90° bend )+ (2nos. × 135° bend)}]**

First, we will calculate the value of **a1 & b1** **a1** = [(column width ) – {(2nos. × clear cover) + (2nos.× 1/2 dia. of stirrup-1 bar)}]

**b1**= [ x + ( 2nos.× 1/2 dia. of mid bar.) + ( 2nos. × 1/2 dia of stirrup-1 bar )]

**x**

**x**= [column depth – {(2nos.×cover )+( 2nos.× dia. of stirrup-3)+ (2nos.× 1/2 dia. of outer bar)}] ÷ 3

**= [(2nos × b2) + (2nos. × a2) + (2nos. × hook length) – { (3nos. × 90° bend )+ (2nos. × 135° bend)}]**

**b2 & a2**

**b2**= [(column depth ) – {(2nos. × clear cover) + (2nos.× 1/2 dia. of stirrup-2)}]

**a2**= [ y + ( 2nos.× 1/2 dia. of mid bar.) + ( 2nos. × 1/2 dia of stirrup-2 )]

**y**= [column width – {(2nos.×cover )+( 2nos.× dia. of stirrup-3)+ (2nos.× 1/2 dia. of outer bar)}] ÷ 3

**= [(2nos.× a3) + (2nos. × b3) + (2nos. × hook length) – {(3nos. × 90° bend )+ (2nos. × 135° bend)}]**

First, we will calculate the value of **a3 & b3**

**a3** = [(column width ) – {(2nos. × clear cover) + (2nos.× 1/2 dia. of stirrup-3)}]

**b3** = [(column depth ) – {(2nos. × clear cover) + (2nos.× 1/2 dia. of stirrup-3)}]

**Cutting Length of Mesh Bar Formula:**

**Volume of Steel Reinforcement for Different RCC member:**

RCC Member | Volume of Steel by volume of Concrete |

Slab | 1.5% – 2% |

Column | 2.5% – 3% |

Beam | 2.5% – 3% |

For Example,

for 10 M^{3} concrete in Column, considering 2.5% of steel Volume, the column has a 0.25 M^{3} of steel. Calculate the total weight of steel and steel weight per M^{3}.

Volume of Steel for 10m^{3} Concrete = 0.25 m^{3}

Wight of Steel Per M^{3}

Concrete = total Volume of steel X Density of Steel (i.e. 7850 Kg/M^{3})

Weight of steel for 10 M^{3} concrete = 0.25 X 7850 = 1962.5 Kg.

For 10 m^{3} Concrete,

the total steel required is 1962.5 Kg. For 1 m^{3} Concrete, the total Steel required is 196.25 Kg. **BBS Sample Excel Sheet**

**Rolling Margin of Reinforcement Steel Bar Formula:**

Cut reinforcement bar into 3 pieces, each length 1 meter Weight Each piece differently i.e. 10 mm Día Bar, **Reinforcement calculation excel**

1st one weight 0.617,

2nd one weight 0.62,

3rd one weight 0.625

Now Calculate the rolling margin of Reinforcement bar

**Standard Hook and Bend Length Formula as per ACI 318:**

**Development Length for Reinforcement Bars:**

**Advantages of Bar Bending Schedule:**

**Cutting Length**and**Bending of Reinforcement**can be done.**BBS**avoids wastages of**steel reinforcement**and also save the project cost- It provides better estimation of reinforcement steel requirements for each and every structure member.
**bbs formula** - BBS is very much useful during auditing of reinforcement and provides check or Theft or pilferage.
**bar bending schedule calculation formula** - It enables easy and fast
**preparation of Bills**of construction work for clients and contractors. Reinforcement calculation excel

**Why Steel is Used as Reinforcement:**

- Coefficient of thermal expansion characteristics similar to concrete.
- Good strength for economic design of RCC structures
- Good gripping or good bonding with concrete.
- Good resistance against corrosion for higher durability.
- Good bendability for providing required shape.
**Rein forcement calculation excel**

**Types of Reinforcement Bars:**

- Fe-250
- Fe-415
- Fe-500
**Basics of Bar Bending Schedule Formulas**

**OTHER POSTS:**

#### How to Calculate the Cutting Length of Spiral Bar or Helix Bar | BBS

#### How to Calculate Cutting Length of Stirrups

### Difference between Plinth Level, Ground Level, Sill level and Lintel Level

#### How to Calculate Unit Weight of Steel Bars | Steel Weight Formula

#### How To Find Out The Cutting Length Of Main Bars & Circular Rings

### Bar Bending Schedule (BBS) | BBS Step by Step Preparation | Excel Sheet

### Bar Bending Schedule Basic Formulas | BBS Formula | What is BBS

**Watch All BBS Example Videos on Youtube**

**Conclusion:**

Full article on **What is Bar Bending Schedule | Basics of Bar Bending Schedule Formulas | BBS Formulas | Reinforcement Calculation Excel**** |** **How to Make Bar Bending Schedule | Bar Bending Schedule Calculation Formulas****.** Thank you for the full reading of this article in “**The Civil Engineering**” platform in English. If you find this post helpful, then help others by sharing it on social media. **If any formula of BBS is missing from this article please tell me in comments.**

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