Bar Bending Schedule

What is a Bar Bending Schedule (BBS)?

It is a process of cutting and bending reinforcement bars into shapes suggested by a structural engineer.

It is a comprehensive list that describes the location, mark, type, size, length, number and bending details of each bar in a reinforcement drawing of a structure. The process of listing is called scheduling.

What does a BBS consists of?     

A BBS provides us with

·         Member identification

·         Bar Mark

·         Shape of bending

·         Diameter of Bar

·         Length of each Bar

·         Total no. of Bars

·         Total length

·         Weight

Advantages of preparing a BBS

·       If available the cutting and bending can be done elsewhere (example: in a factory) and transported to a site which results in faster execution and reduces the construction time.

·       It improves quality control as reinforcement is provided as per BBS.

·       It provides better estimation of steel requirement.

How to prepare a BBS?

1.      Identification of Members (Steel Bars)

Each type of bar usually has a bar mark/designation.

2.      Counting each type of bar

- For a small concrete structure, we can count it manually.

- For a big slab structure, to calculate the no. of bars we need to find the width, clear cover and c/c (center to center) spacing between bars.

3.      Calculating the length of Rebar

The total length of each member bar is calculated. We shouldn’t forget to add the development length or anchorage length.

4.      Calculating the unit weight of individual bar

The unit weight of individual bar is usually calculated by the formula

5.      Calculation of total weight

We can find out the total weight of steel required by simply using the formula

Guidelines / Tips

·         Prepare BBS for different RCC elements separately. Example: Column, Beam, Slab, Footing, etc.

·         It is preferable that the bars are listed in the schedule in a numerical order for convenience.

·         It should be provided separately not as a part of detailed reinforcement drawing.

Example 

Bar bending Schedule of a Beam.

All the calculations done in excel.

Download the excel file >>>>BBS.xlsx<<<<

Download the whole pdf file >>>>Barbending.pdf<<<<