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Rebar and steel of a building or shed, line by line
Project steel, midpoint of the range
—t
The result appears hereEnter Area of one floor and Number of floors.
Keep the final list, and its cost at each day’s prices, here:Project shopping list
Method
Concrete frame: the total built area (area of one floor × number of floors) is multiplied by the rebar consumption for that number of floors. The table below gives it for concrete frames of 1 to 6 floors; it covers column, beam and slab rebar. Foundation rebar adds 20 to 30 per cent and site waste 3 to 5 per cent. Shear walls and long spans raise consumption.
Steel frame: the total built area is multiplied by the steel consumption of the lateral system; roof rebar is calculated separately from the floor system. In braced frames, 30 to 45 kg per m² of that is I-beams and the rest is bracing, plates and connections.
Shed: the plan area (span × length) is multiplied by the frame weight per m² of a plate-girder shed. The table covers sheds with no middle column and spans of 10 to 30 m; purlins, cladding and foundation are separate.
The coefficients are ranges. The tool shows each line’s range and orders by its midpoint; pick a product and a mill and that quantity goes to the cart or to the “Project shopping list” at today’s price.
The structural drawings set the final quantities; send them and an Ahantime expert prepares the exact purchase list from them.
Reference table
The coefficients in common use in Iranian construction; the ones the calculator above applies.
| Floors | Rebar (kg per m²) |
|---|---|
| 1 floors | 25 to 35 |
| 2 floors | 30 to 40 |
| 3 floors | 30 to 45 |
| 4 floors | 35 to 50 |
| 5 floors | 40 to 55 |
| 6 floors | 45 to 60 |
| System | Steel (kg per m²) |
|---|---|
| Concentric bracing | 40 to 70 |
| Eccentric bracing | 50 to 75 |
| Intermediate moment frame | 65 to 105 |
| Special moment frame | 70 to 115 |
| Floor system | Rebar (kg per m²) |
|---|---|
| Joist and block | 5 to 7 |
| Composite deck | 8 to 12 |
| Solid concrete slab | 10 to 16 |
| Span | Frame (kg per m²) |
|---|---|
| 10 m span | 25 |
| 15 m span | 28 |
| 20 m span | 30 |
| 25 m span | 37 |
| 30 m span | 43 |
| Member | Bar size |
|---|---|
| Foundation | 16 to 20 |
| Column | 16 to 20 |
| Main beam | 14 to 18 |
| Slab and secondary beam | 12 to 16 |
| Stirrup | 8 to 10 |
The total built area is 800 m². At 35 to 50 kg per m² for a 4-floor building, column, beam and slab rebar comes to 28 to 40 t. With foundation and site waste, all rebar is 34.61 to 54.6 t.
As a building rises, column loads and seismic forces grow and rebar per m² goes up: from 25 to 35 kg per m² for one floor to 45 to 60 kg for six floors.
The total built area is 1,000 m². With concentric bracing, steel consumption is 40 to 70 kg per m², of which 30 to 45 kg is I-beams. With composite-deck roof rebar, all steel comes to 48 to 82 t.
Foundation rebar is 20 to 30 per cent of the frame rebar and is counted on top of it. Cutting and bending add 3 to 5 per cent of site waste; 3 per cent on a large project and 5 per cent on a small one.
The plan area is 800 m² and the frame of a plate-girder shed of 20 m span weighs 30 kg per m²; that is 24 t.
Columns and foundations use 16 to 20 mm bars, main beams 14 to 18 and slabs and secondary beams 12 to 16; stirrups are 8 or 10 mm. The structural drawings set the size and number of every bar; turn them into bars and kilograms with Ahantime’s “Rebar and stirrup schedule”.
Send the structural drawings to Ahantime. An expert prepares the rebar and steel list from them and issues a proforma at today’s price. There is no online payment; the purchase is closed on a call with the expert.