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A BBS (Bar Bending Schedule) is a table that lists each reinforcement bar’s mark, diameter, shape, cut length and quantity so steel can be cut and bent accurately.
Documents & estimates · Also: Bar Bending Schedule
A BBS (Bar Bending Schedule) is a table that lists each reinforcement bar’s mark, diameter, shape, cut length and quantity so steel can be cut and bent accurately.
Plain-language explanations for planning and learning. Local codes, consultant advice and contract documents take precedence over glossary summaries.
Structural drawings show bar layouts; the BBS translates them into fabrication instructions — bar mark, diameter, number of bars, cutting length, bending dimensions and total weight. It reduces wastage and disputes on site. Lengths must follow the engineer’s hooks, bends and lap rules. Varnarc’s BBS organiser helps structure planning data; it does not replace a structural engineer’s approved schedule.
Example: Bar mark B1 — 12 mm dia, 16 bars, cutting length 4.2 m each — appears as one BBS row with total length and weight derived from the steel formula (d²/162).
| Unit | Notes |
|---|---|
| mm | Bar diameter |
| m | Cutting length per bar |
| kg | Weight from length × unit weight |
Reinforcement
Reinforcement is the steel (usually TMT bars) embedded in concrete to carry tensile and shear forces that plain concrete cannot resist alone.
TMT
TMT bars are thermo-mechanically treated reinforcement steel rods with a tough outer layer and ductile core, widely used in RCC buildings.
RCC
RCC (Reinforced Cement Concrete) is concrete strengthened with steel bars so it can resist both compression and tension in beams, slabs, columns and footings.
Each Varnarc glossary term includes a simple definition, a technical explanation, a worked example, units where relevant, and links to calculators or materials so you can take the next action. Thin one-line dictionary stubs are not published.
Glossary 2026.08.1
Typically the structural design team or a detailing consultant. Site teams may prepare cutting lists from the approved BBS, not invent bar sizes.