Data Table for Reinforcement Areas
The data (refer below) are for rebar sizes & areas used by engineers for concrete design, in
spreadsheet excel format. When you design an RC beam you would need to determine the number of bars required, given
the areas of reinforcements. Also when you design a slab or wall, you would need a table of bar sizes and spacings
for the required areas/m width.
Download Rebar Areas.xls Data File
It is recommended that these Digital Design Data be downloaded, compiled into a Your Own Digital
Design Data and kept in your computer for ease of reference. This will eliminate the need for carrying
hard copies of data, charts, standards, codes, tables around. Just keep all such data in one dedicated Directory in
your computer, eg: "Design Data". We have also compiled a huge Digital Design Data for issue to Members
progressively and be hosted online for members reference and use anytime.
Table 1 is a small table which you can just select the cells, copy and paste into any
excel calculation sheet, to be used whenever required to estimate Bar size, Numbers of Bars or
Table 2 is a standard chart for finding number of bars for beams.
Tabel 3 is a standard chart for finding bar spacings in slabs and walls.
You can copy and paste any of the Tables 1, 2, or 3 anywhere into your calc sheets for ease
of reference or simple copy the whole sheet.
If you are not sure how to use this "digital data library" just Contact
Us for help
How to select Preferred Bar Sizes
Engineers should be aware that there are actually "commercial steel bars" and "BS Standard Steel bars". The same
also applies to Steel Sections like H-beams, C-Channels, etc. Steel Bars are generally a few "mm" smaller for
commercial bars. Eg if you design to BS 8110, and you specify T20, you would expect 20mm diameter, but for
commercial grade you would get 18mm or 19mm. It is impossible to distinguish between commercial and BS grades by
eyes so it is best that you should specify bar sizes on the higher side, assuming most realistically, that
contractors will use the commercial grade. Eg if your design require T16-160cts, then specify T16-150cts is
reasonable, allowing for either a T14 or a T15 being used.
Preferred bar sizes to chose are as follows:-
There are no hard rules about what sizes to use or what spacings other than determined by calculations and what
is common practiced in the local construction market. Do check out experienced contractors for their preferred
For Beams :-
- Main Bars - T12, T16, T20, T25, T32
- For Links - R8, R10, T8, T10
For Columns :-
- Main Bars - T10, T12, T16, T20, T25
- For Links - R8, R10, T8, T10
For slabs :-
- Main Bars - T10, T12, T16
- Minor Bars - T8, T10
For Foundations :-
- Main Bars - T16, T20, T25
- Minor Bars - T12, T16 (Cage)
All Bars should be ribbed at 460N/mm2 yield. Mild steel are not must use now except for links.
How to Select Preferred Bar Spacings
Generally for Slabs and Walls
- Spacings : 100mm, 125mm, 150mm, 175mm, 200mm, 225mm, 300mm. Exceeding 300mm is not recommended unless
careful checks on cracks caried out.
- Increments should preferably be in 25mm, eg if calculated bar spacing is T10-170mm, Use T10-150mm
instead, or T10-175mm marginally lower.
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