40 mm Reinforcing Bar - TCVN (Vietnam)
40 mm is a TCVN (Vietnam) reinforcing bar to TCVN 1651-2 / TCVN 5574. Its nominal diameter is 40 mm, giving a cross-section area As of 1256.6 mm² and a mass of 9.864 kg/m. It is supplied in grade CB300-V / CB400-V / CB500-V with characteristic yield f_yk = 400 MPa. The tables below give the total steel area for 1-10 bars and the area per metre of width at common bar spacings.
Bar properties
| d | Nominal diameter | 40 mm |
| As | Cross-section area | 1256.6 mm² |
| m | Mass per metre | 9.864 kg/m |
| u | Nominal perimeter | 125.7 mm |
| f_yk | Characteristic yield | 400 MPa |
Total area for n bars (As = n × 1256.6 mm²)
| Bars | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
|---|---|---|---|---|---|---|---|---|---|---|
| As (mm²) | 1,257 | 2,513 | 3,770 | 5,026 | 6,283 | 7,540 | 8,796 | 10,053 | 11,309 | 12,566 |
Area per metre at spacing (As/m = 1000/s × 1256.6 mm²)
| s (mm) | 75 | 100 | 125 | 150 | 175 | 200 | 250 | 300 |
|---|---|---|---|---|---|---|---|---|
| As/m (mm²/m) | 16,755 | 12,566 | 10,053 | 8,377 | 7,181 | 6,283 | 5,026 | 4,189 |
Source: TCVN 1651-2 / TCVN 5574. Area = π/4 × d² for metric bars; ASTM areas are the standard's tabulated nominal values. Grades available: CB300-V, CB400-V, CB500-V.
Other TCVN (Vietnam) bar sizes
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