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Reinforcement Bar

Bars

Reinforcing steel is used in bridges, buildings, skyscrapers, homes, warehouses, foundations and roads to increase the strength of the concrete and ultimately help hold up the structures.

While concrete alone is strong, reinforcing steel significantly increases the strength of concrete in an economical and safe manner.Steel Reinforcing bars are produced by pouring molten steel into casters and then running it through a series of stands in the mill, which shape the steel into reinforcing bars. The cross hatchings, called "deformations," help secure the steel and transfer the load between it and the concrete.
 
For buildings, bridges, highways, and runways, the cast-in-place concrete body and fabricated steel musculature of reinforcing bars work in tandem to create one of the most durable and most economical composite materials.Reinforced concrete is a composite material. The concrete provides the material's compressive strength, while the steel — in the form of embedded reinforcing bars — provides tensile strength.
Shape Code Method of measurement of bending dimensions Total length of bar (L) measured along centreline
00 A
01 A Stock length
See Note 4.
11 A+(B) - 0.5r - d
Neither A nor B shall be less
than P in Table 2.
12 A+ (B) - 0.43R - 1.2d
Neither A nor B shall be less
than P in Table 2 nor less
than (R + 6d).
13 A + 0.57B + (C) - 1.6d
B shall not be less than 2(r+d).
Neither A nor C shall be less
than P in Table 2 nor less than
(B/2 + 5d). See Note 3.
14 A +(C) - 4d
Neither A nor (C) shall be less
than P in table 2. See note 1.
15 A + (C)
Neither A nor (C) shall be less
than P in Table 2.
See Note 1.
21 A+B + (C) - r - 2d
Neither A nor (C) shall be less
than P in Table 2.
22 A + B + C + (D)
- 1.5r - 3d

C shall not be less than 2(r+d).
Neither A nor (D) shall be less
than P in Table 2. (D) shall not
be less than C/2+5d.
Shape Code Method of measurement of bending dimensions Total length of bar (L) measured along centreline
23 A+B + (C) - r - 2d
Neither A nor (C) shall be less
than P in Table 2.
24 A+ B + (C)
A and (C) are at 90° to
one another.
25 A+ B + (E)
Neither Anor B shall be less than P in
Table 2 If E is the critical dimension,
schedule a 99 and specify Aor B as the
free dimension.
See Note 1.
26 A + B + (C)
Neither A nor (C) shall be
less than P in Table 2.
See Note 1.
27 A + B + (C) - 0.5r - d
Neither A nor (C) shall be less
than P in Table 2. See Note 1.
28 A + B + (C) - 0.5r - d
Neither A nor (C) shall be less
than P in Table 2. See Note 1.
29 A + B + (C) - r - 2d
Neither A nor (C) shall be less
than P in Table 2. See Note 1.
31 A+ B + C + (D)
- 1.5r - 3d

Neither A nor (D) shall be
less than P in Table 2.
32 A + B + C+ (D)
-1.5r - 3d

Neither A nor (D) shall be
less than p in Table 2.
 

All other shapes in BS8666 are shape code 99. Shape code 99 shall have a maximum of four bends. Publication - British Standard BS 8666:2005 Scheduling, dimensioning,

Shape Code Method of measurement of bending dimensions Total length of bar (L) measured along centreline
33 A
34 A Stock length
See Note 4.
35 A+(B) - 0.5r - d
Neither A nor B shall be less
than P in Table 2.
36 A+ (B) - 0.43R - 1.2d
Neither A nor B shall be less
than P in Table 2 nor less
than (R + 6d).
41 A + 0.57B + (C) - 1.6d
B shall not be less than 2(r+d).
Neither A nor C shall be less
than P in Table 2 nor less than
(B/2 + 5d). See Note 3.
44 A +(C) - 4d
Neither A nor (C) shall be less
than P in table 2. See note 1.
46 A + (C)
Neither A nor (C) shall be less
than P in Table 2.
See Note 1.
47 A+B + (C) - r - 2d
Neither A nor (C) shall be less
than P in Table 2.
51 A + B + C + (D)
- 1.5r - 3d

C shall not be less than 2(r+d).
Neither A nor (D) shall be less
than P in Table 2. (D) shall not
be less than C/2+5d.
Shape Code Method of measurement of bending dimensions Total length of bar (L) measured along centreline
56 A+B + (C) - r - 2d
Neither A nor (C) shall be less
than P in Table 2.
63 A+ B + (C)
A and (C) are at 90° to
one another.
64 A+ B + (E)
Neither Anor B shall be less than P in
Table 2 If E is the critical dimension,
schedule a 99 and specify Aor B as the
free dimension.
See Note 1.
67 A + B + (C)
Neither A nor (C) shall be
less than P in Table 2.
See Note 1.
75 A + B + (C) - 0.5r - d
Neither A nor (C) shall be less
than P in Table 2. See Note 1.
77 A + B + (C) - 0.5r - d
Neither A nor (C) shall be less
than P in Table 2. See Note 1.
98 A + B + (C) - r - 2d
Neither A nor (C) shall be less
than P in Table 2. See Note 1.
99 All other shapes where standard shapes cannot be used.
No other shape code number, form of designation or abbreviation
shall be used in scheduling.
Adimensioned sketch shall be drawn over the dimension columns
Ato E. Every dimension shall be specified and the dimension that is
to allow for permissible deviations shall be indicated in parenthesis,
otherwise the fabricator is free to choose which dimension shall
allow for tolerance.
See Note 2.
 
Nominal size of bar
d
mm
Minimum radius for scheduling
r
mm
Minimum diameter of
bending former
m
mm
Minimum Nominal size of bar end projection, P
General (min 5d straight),
including links where
bend ????150º
mm
Links where
bend ????150º
(min 10d straight)
mm
6 12 24 110ª 1.10ª
8 16 32 115ª 115ª
10 20 40 120ª 130
12 24 48 125ª 160
16 32 64 130 210
20 70 140 190 290
25 87 175 240 365
32 112 224 305 465
40 140 280 380 580
50 175 350 475 725

ª The minimum end projections for smaller bars is governed by the practicalities of bending bars.

NOTE 1: The Length equations for shape codes 14, 15, 25, 26, 27, 28, 29, 34, 35, 36 and 46 are approximate and where the bend angle is greater than 45°, the length should be calculated more accurately allowing for the difference between the specified overall dimensions and the true length measured along the central axis of the bar. When the bending angles approach 90°, it is prefarable to specify shape code 99 with a fully dimensioned sketch.

NOTE 2: Five bends or more might be impractical within permitted tolerances.

NOTE 3: For shapes with straight and curved lengths (e.g shape codes 12, 13, 22, 33 and 47) the largest practical mandrel size for the production of a continuous curve is 400mm. See also Clause 10.

NOTE 4: Stock lengths are available in a limited number of lengths (e.g 6m, 12m). Dimension A for shape code 01 should be regarded as indicative and used for the purpose of calculating total length. Actual delivery lengths should be by agreement with the supplier.


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