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Grades
Historically in Europe, rebar comprised mild steel material
with a yield strength of approximately 250 N/mm˛. Modern rebar
comprises high-yield steel, with a yield strength more typically
500 N/mm˛. Rebar can be supplied with various grades of
ductility, with the more ductile steel capable of absorbing
considerably greater energy when deformed - this can be of use
in design against earthquakes for example.
Rebar Designation
For clarity, reinforcement is usually tabulated in a
Reinforcement Schedule on construction drawings. This eliminates
ambiguity in the various notations used in different parts of
the world. The following list provides examples of the
different
notations used in the architectural, engineering, and
construction industry.
United States
|
Designation |
Explanation |
| #4 @ 12 oc, T&B, EW |
Number 4 rebars spaced 12 inches on centre
(centre-to-centre distance) on both the top and bottom
faces and in each way as well, i.e. longitudinal and
transverse |
| 3 #4 |
Three number 4 rebars |
| #3 ties @ 9 oc, 2 per set |
Number 3 rebars used as stirrups, spaced at 9 inches
on centre. Each set consists of two ties, which is
usually illustrated. |
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