What is meant by Bar Bending Schedule (BBS) Bar Bending Schedule, commonly referred to as “BBS” is a comprehensive list that describes the location, mark, type, size, length and number, and bending details of each bar or fabric in a Reinforcement Drawing of a Structure.
What Is The Bar Bending Schedule?
A bar bending schedule is a list of the various lengths and diameters of steel reinforcement bars (rebar) that are required for a particular concrete structure. The schedule is prepared by a rebar contractor and is used to fabricate the steel reinforcement for the concrete.
The bar bending schedule takes into account the type of rebar being used, the dimensions of the concrete structure, and the specific reinforcement requirements for that structure. It is important to note that the bar bending schedule is not a design document, but rather a production document. This means that it does not specify how the reinforcement should be placed in the concrete, but rather how much and what size bars are needed.
If you're planning on doing any concrete work, it's important to understand what a bar bending schedule is and how to use one. With this information, you'll be able to get accurate estimates for your project and ensure that everything goes smoothly.
Why does it have to be on a schedule?
The bar bending schedule is a critical part of the construction process. It ensures that the rebar is properly installed and that the concrete pour is completed on time. Without a bar bending schedule, the construction project could be delayed or even cancelled.
What are the benefits of following BBS Rules?
There are many benefits to following the rules of a BBS. Perhaps the most obvious benefit is that it helps to ensure the safety of both workers and patrons. By adhering to strict guidelines, potential hazards can be avoided and accidents can be prevented. In addition, following a BBS can also help to improve the efficiency of construction projects. By having a clear plan and set schedule, workers will be able to complete their tasks in a timely manner, without compromising on quality.
Types of BBS: Cross Bar, Diagonal (longitudinal), Longitudinal Face
There are three types of bar bending schedules (BBS): Cross Bar, Diagonal (longitudinal), and Longitudinal Face. Each type of BBS has its own set of rules and regulations that must be followed in order to ensure the safety of the workers and the accuracy of the project.
Cross Bar: A cross bar is a type of BBS that is used to connect two or more bars together. This type of BBS is typically used in projects that require a large amount of steel, such as bridges or buildings.
Diagonal (longitudinal): A diagonal longitudinal BBS is used to connect two bars at an angle. This type of BBS is typically used in projects that require a smaller amount of steel, such as fences or stairs.
Wheel Forge Marks?
How to prepare a BBS?
Necessary Columns
- Bar number/Bar Mark Reference
- Bar shape
- Diameter
- Spacing
- Length of bar
- Cutting Length
- Number of bars
Most of the information in a BBS can be found in reinforcement drawings of the structural unit. Bar shape, diameter, length, and spacing is directly entered in the schedule just by looking at the drawings, which will have detailed dimensioning.
The number of bars:
Suppose the spacing of stirrups is 150 c/c and the length along which they are placed is 6800 mm, we can find the number of bars by the formula below
[ Length / Spacing ] + 1 = number of bars
[ 6800 / 150 ] + 1 = 46.33
In this case, we always round up. Hence, we require 47 stirrups.
Cutting Length:
We must remember that steel is ductile in nature and is subject to elongation. Hence, the length of a bar is increased when bends or hooks are introduced. Hence, certain deductions are needed to offset this increase in length.
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