What is a Bar Bending Schedule (BBS)?
A Bar Bending Schedule (BBS) is a comprehensive tabular list of reinforcement steel bars used in a concrete structure. It details the location, mark, type, size, length, number, and bending details of each bar. It is essential for optimizing steel cutting, reducing waste, and ordering exact material quantities.
How is Rebar Weight Calculated?
The weight of the reinforcement steel is calculated using the standard empirical formula based on the diameter (D in mm) and the total length (L in meters) derived from the density of steel (7850 kg/m³).
Practical Example
If you have 10 U-stirrups of 8mm diameter, with dimensions a=0.2m, b=0.3m, and c=0.2m. The partial length of one stirrup is 0.2 + 0.3 + 0.2 = 0.7m. The total length for 10 stirrups is 10 × 0.7 = 7 meters. The weight is (8² / 162) × 7 = 0.395 × 7 = 2.76 kg.
Frequently Asked Questions
Why is a Bar Bending Schedule important?
It provides exact quantities for purchasing, minimizes steel waste during cutting, and significantly speeds up the construction process on site by giving clear instructions to the steel fixers.
What is the standard waste percentage for steel?
Usually, a 3% to 5% waste factor is added to the net weight to account for lap splices, cutting losses, and offcuts during fabrication.
Can I export this schedule to AutoCAD?
Yes! Our tool allows you to export the generated schedule and the summary table directly to a DXF file, which can be seamlessly opened in AutoCAD, Civil 3D, or any CAD viewer.
Automate your steel estimates
Generate complete Bill of Quantities (BOQ) and Unit Price Analysis (APU) for your structural works in minutes.
Try Prixun.com