Bar Bending Schedule: A Complete Guide with PDF Examples
Bar Bending Schedule PDF Free Download
Are you looking for a way to simplify and optimize your reinforced concrete construction project? Do you want to save time, money, and materials while ensuring quality and accuracy? If yes, then you need a bar bending schedule (BBS).
bar bending schedule pdf free download
A bar bending schedule is a document that lists all the reinforcement bars required for a given structural element, such as a beam, column, slab, or footing. It provides information such as the bar mark, size, shape, length, weight, number, and bending details of each bar. It also shows the location, spacing, and position of the bars in the concrete structure.
A BBS is essential for any reinforced concrete construction project because it helps in:
Estimating the quantity and cost of steel reinforcement
Planning and ordering the steel supply
Cutting and bending the bars as per the design specifications
Placing and fixing the bars in the formwork
Checking and auditing the reinforcement work
Reducing wastage and errors
Improving quality and safety
In this article, we will explain how to prepare a BBS, what software tools you can use to create and manage it, and how to download them for free. Let's get started!
Preparation of BBS
Preparing a BBS is not a difficult task if you follow some simple steps and rules. Here are the main steps involved in preparing a BBS:
Study the structural drawings and note down the details of each structural element, such as the dimensions, concrete grade, cover, reinforcement grade, spacing, etc.
Determine the number of bars required for each element based on the spacing and length.
Calculate the cutting length of each bar by adding or subtracting the bend deductions, hook lengths, lap lengths, etc.
Calculate the total length and weight of each bar by multiplying the cutting length by the number of bars.
Assign a unique bar mark to each type of bar and note down its shape code, size, number, cutting length, total length, weight, and bending details.
Prepare a tabular format to present all the information in an organized manner.
Some of the basic formulas and rules to follow while preparing a BBS are:
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The standard diameter of bars used in reinforced concrete construction are 6 mm, 8 mm, 10 mm, 12 mm, 16 mm, 20 mm, 25 mm, 28 mm, 32 mm, 36 mm, and 40 mm.
The standard length of bars available in the market is 12 m or 40 ft.
The weight of a bar per meter can be calculated by using the formula W = D/162, where W is the weight in kg and D is the diameter in mm.
The bend deduction for a 45-degree bend is 1d, where d is the diameter of the bar. For a 90-degree bend, it is 2d. For a 135-degree bend, it is 3d.
The hook length for a standard hook is 9d.
The concrete cover is the minimum distance between the surface of the concrete and the outermost layer of reinforcement. It varies depending on the type of structure and exposure conditions. For example, it can be 25 mm to 50 mm for beams and columns, and 75 mm for footings.
The lap length is the length by which two bars are overlapped to provide continuity. It depends on the type of bar (tension or compression), concrete grade , and bar diameter. For example, it can be 40d to 60d for tension bars and 24d to 40d for compression bars.
The development length is the length of the bar required to transfer the stress from the bar to the concrete. It depends on the type of bar, concrete grade, bar diameter, and bond condition. For example, it can be 41d to 71d for deformed bars and 78d to 137d for plain bars.
Some of the common errors to avoid while preparing a BBS are:
Mixing up different units of measurement, such as meters and feet, kilograms and pounds, etc.
Using incorrect or inconsistent bend deductions, hook lengths, lap lengths, etc.
Forgetting to add or subtract the concrete cover from the dimensions of the structural element.
Overlapping or crossing the bars in the same layer or direction.
Providing insufficient or excessive reinforcement for the structural element.
BBS Software
While preparing a BBS manually is possible, it can be tedious, time-consuming, and prone to errors. That's why many engineers and contractors prefer to use software tools that can automate and simplify the process of creating and managing BBS. Some of the benefits of using BBS software are:
They can generate accurate and detailed BBS from the structural drawings in a matter of minutes.
They can calculate the cutting length, total length, weight, and cost of each bar automatically.
They can provide graphical representations of the bar shapes and bending details.
They can export the BBS in various formats, such as PDF, Excel, Word, etc.
They can update and modify the BBS easily whenever there are changes in the design or specifications.
They can integrate with other software tools, such as CAD, BIM, ERP, etc.
Some of the popular software tools available for creating and managing BBS are:
NameDescriptionWebsite
Bentley RebarA comprehensive software solution for reinforced concrete detailing and scheduling. It allows users to create 3D models of reinforced concrete structures and generate BBS from them. It also supports various standards and codes of practice.[Bentley Rebar]
CADS RCA powerful software tool for reinforced concrete detailing and bar bending schedule production. It enables users to create 2D drawings of reinforced concrete structures and generate BBS from them. It also offers various features such as clash detection, bar optimization, bar fabrication, etc.[CADS RC]
RGS RebarA user-friendly software tool for reinforced concrete detailing and bar bending schedule generation. It allows users to create 2D drawings of reinforced concrete structures and generate BBS from them. It also provides features such as bar shape library, bar cutting list, bar label printing, etc.[RGS Rebar]
RebarCADA versatile software tool for reinforced concrete detailing and bar bending schedule creation. It enables users to create 2D drawings of reinforced concrete structures and generate BBS from them. It also offers features such as bar nesting, bar marking, bar tracking, etc.[RebarCAD]
RebarWinA simple and efficient software tool for reinforced concrete detailing and bar bending schedule preparation. It allows users to create 2D drawings of reinforced concrete structures and generate BBS from them. It also provides features such as bar shape editor, bar weight calculator, bar cost estimator, etc.[RebarWin]
All these software tools are available for free download from their respective websites. However, some of them may require registration or activation before use. You can also find other free or paid software tools online that can help you with creating and managing BBS.
Conclusion
A bar bending schedule is a vital document for any reinforced concrete construction project. It helps in estimating, planning, executing, and auditing the reinforcement work. It also helps in reducing wastage and errors and improving quality and safety.
To prepare a BBS, you need to study the structural drawings, determine the number of bars required, c