The cross-section of the reinforcement is a standard value and must meet the requirements of building regulations. Since the vendor can change the armor properties at will, there are limits to this.
In accordance with British Standards, the following table of reinforcement areas may be used. Indicates the diameter of the bar, area of reinforcement, area of reinforcement depending on the number of bars, etc.
The same reinforcement details are used in European standards.
British/European reinforcement diagram
The table above shows the weight of Reinforced Steel per meter of length.
Furthermore, the cross-section of the reinforcement as a function of the distance between the bars can be found in the following table.
The table above is very useful when creating designs. If we know the cross-section of the reinforcements from the design, we can select the bar diameter and reinforcement spacing.
For more information, see the article Steel Reinforcement – Guide to Design and Construction for more information on reinforcement.
Different slash notations are used in different countries.
US Bar Size Chart with Rebar Cross Section
The following bar sizes and rebar areas are used.
|
Imperial
Bar size |
Metric Bar Chart
Size (soft) |
Linear mass density | Nominal diameter | Nominal area | |||
| Pound ⁄ Foot | kg ⁄ M | (In) | (mm) | (in²) | (mm²) | ||
| #two | Number 6 | 0.167 | 0.249 | 0.250 = 2 ⁄ 8th = 1 ⁄ 4 | 6:35 am | 0.05 | 32 |
| #3 | #10 | 0.376 | 0.560 | 0.375 = 3 ⁄ 8º | 9.53 | 0.11 | 71 |
| #4 | #13 | 0.668 | 0.994 | 0.500 = 4 ⁄ 8º = 1 ⁄ 2 | 12.7 | 0.20 | 129 |
| #5 | #16 | 1,043 | 1,552 | 0.625 = 5 ⁄ 8º | 15.9 | 0.31 | 200 |
| #6 | #19 | 1,502 | 2,235 | 0.750 = 6 ⁄ 8th = 3 ⁄ 4 | 19.1 | 0.44 | 284 |
| #7 | #22 | 2,044 | 3,042 | 0.875 = 7 ⁄ 8º | 22.2 | 0.60 | 387 |
| #8 | #25 | 2,670 | 3,973 | 1,000 = 8º ⁄ 8º | 25.4 | 0.79 | 510 |
| #9 | #29 | 3,400 | 5,060 | 1.128 ≈ 9 ⁄ 8º | 28.7 | 1.00 | 645 |
| #10 | #32 | 4,303 | 6,404 | 1.270 ≈ 10 ⁄ 8º | 32.3 | 1.27 | 819 |
| #11 | No. 36 | 5,313 | 7,907 | 1.410 ≈ 11 ⁄ 8º | 35.8 | 1.56 | 1,006 |
| #14 | No. 43 | 7,650 | 11,384 | 1.693 ≈ 14 ⁄ 8º | 43.0 | 2.25 | 1,452 |
| #18 | #57 | 1:60 p.m. | 20,239 | 2.257 ≈ 18 ⁄ 8º | 57.3 | 4:00 | 2,581 |
A different notation applies to Canadian standards.
Canadian Bar Chart
The following table lists Canadian bar sizes and areas.
|
Metric
Linear linear bar size |
Linear mass density
(kg/m) |
Nominal diameter
(mm) |
cross section
Area (mm²) |
| 10 million | 0.785 | 11.3 | 100 |
| 15 million | 1,570 | 16.0 | 200 |
| 20 million | 2,355 | 19.5 | 300 |
| 25 million | 3,925 | 25.2 | 500 |
| 30 million | 5,495 | 29.9 | 700 |
| 35 million | 7,850 | 35.7 | 1000 |
| 45 million | 11,775 | 43.7 | 1500 |
| 55 million | 19,625 | 56.4 | 2500 |
Related articles
- Anchor length in foundation reinforcement
- Tensile strength of reinforcing bars
- Removing rust from steel reinforcement – a practical approach
- All about mechanical clutches
- Reinforcement rib – surface geometry of reinforcement bars
- Booster test
- How to check if a section is over amplified
- Balanced, over-amplified and under-amplified
