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Home >> Products >> Reinforcement >> Shape Codes to BS8666: 2005

Shape Codes to BS8666: 2005
Shape Code Total length of bar L
Measured along center line
00
A
12 A + (B) – 0.43R – 1.2d
Neither A nor B shall be less than P in Table 2 nor less than (R + 6d)
14 A + (C) – 4d
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
23 A + B + (C) – r – 2d
Neither A nor (C) shall be less than P in Table 2
25 A + B + (E)
Neither A nor B shall be less than P in Table 2. If E is the critical dimension, schedule a 99 and specify A or B as the free dimension. 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.
29 A + B + (C) – r – 2d
Neither A nor (C) shall be less than P in Table 2. See note 1.
32 A + B + C + (D) – 1.5r – 3d
Neither A nor (D) shall be less than P in Table 2. See note 1.
34 A + B + C + (E) – 0.5r - d
Neither A nor (E) shall be less than P in Table 2. See note 1
36 A + B + C + (D) – r – 2d
Neither A nor (D) shall be less than P in Table 2. See note 1
44 A + B + C + D + (E) – 2r – 4d
Neither A nor (E) shall be less than P in Table 2
47 2A + B + 2C +1.5r - 3d
(C) and (D) shall be equal and not more than A nor less than P in Table 2. Where (C) and (D) are to be minimized the following formula may be used:
L = 2A + B + max (21d, 240)
56 A + B + C + (D) + 2(E) – 2.5r – 5d
(E) & (F) shall be equal and not more than B or C, nor less than P in Table 2
64 A+B+C+2D+E+(F)-3r-6d
Neither A nor (F) shall be less than P in Table 2. See note 2
75 p (A-d)+B
Where B is the overlap
98 A+2B+C+(D)-2r-4d
Isometric sketch.
Neither C nor (D) shall be less than P in Table 2
Shape Code Total length of bar L
Measured along center line
11

A+(B)-0.5r-d
Neither A nor B shall be less than P in Table 2
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. Key: 1 - Semi-circular
15 A + (C)
Neither A nor (C) shall be less than P in Table 2. See note 1.
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. Where used as a link, A shall not be less than P for links in Table 2 and (D) shall not be less than (C/2 + 5d.) Key: 1 - Semi-circular
24 A+B+(C)
A and (C) are at 90° to one another
26 A + B + (C)
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.
31 A + B + C + (D) – 1.5r – 3d
Neither A nor (D) shall be less than P in Table 2
33 2A + 1.7B + 2C - 4d
A shall not be less than 12d + 30mm. B shall not be less than 2(r + d). (C) shall not be less than P in Table 2, nor less than (B/2 + 5d.) See Note 3.
Key: 1 - Semi-circular
35 A + B + C + (E) – 0.5r – d
Neither A nor (E) shall be less than P in Table 2. See note 1
41 A + B + C + D + (E) - 2r - 4d
Neither A nor (E) shall be less than P in Table 2. May also be used for flag link viz:

46 A + 2B + C + (E)
Neither A nor (E) shall be less than P in Table 2. See note 1
51 2 (A + B + (C)) - 2.5r - 5d
(C) and (D) shall be equal and not more than A or B nor less than P for links in Table 2. Where (C) and (D) are to be minimized the following formula may be used: L = 2A + 2B + max (16d,160)
63 2A + 3B + 2(C) - 3r - 6d
(C) and (D) shall be equal and not more than A or B nor less than P for links in Table 2. Where (C) and (D) are to be minimized the following formula may be used: L = 2 A + 3B + max(14d, 150)
67 A
See Clause 10
77 Cp(A-d) + B
Where B is greater than A/5 this equation no longer applies, in which case the following formula may be used:
L = C ((p(A-d))² + B²)1/2
C = Number of turns
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.

A dimensional sketch shall be drawn over the dimension columns A to 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 dimensions shall allow for tolerance.

To be calculated

See Note 2.

The values for minimum radius and end projection, r and P respectively, as specified in Table 2, shall apply to all shape codes (see 7.6).
The dimensions in parenthesis are the free dimensions. If a shape given in this table is required but a different dimension is to allow for the possible deviations, the shape shall be drawn out and given the shape code 99 and the free dimension shall be indicated in parenthesis.
The length of straight between two bends shall be at least 4d, see figure 6.
Figures 4, 5 and 6 should be used in the interpretation of bending dimensions.

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 45º, 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 90º, it is preferable to specify shape code 99 with a fully dimensional 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.

Notation of steel reinforcement
Type of steel reinforcement
Notation 
Grade B500A, Grade B500B or Grade B500C conforming to BS4449:2005  H
Grade B500A conforming to BS4449:2005
 A
Grade B500B or Grade B500C conforming to BS4449:2005     
 B
Grade B500C conforming to BS4449:2005
 C
A specified grade and type of ribbed stainless steel conforming to BS 6744:2001
 S
Reinforcement of a type not included in the above list having material properties that are defined in the design or contract specification.
 X

NOTE In the Grade description B500A etc, 'B' indicates reinforcing steel.



Dimensioning of an acute angle

Fig. 4


Dimensioning of cranked bars

Fig. 5


Example of bar with more than one bend

Fig. 6
Table 2 Minimum Schedule Radius and Bend Allowances

Normal
Bar Size
d
Minimum Radius
for Scheduling
r
Minimum
Diameter of
Bending Former
Minimum end projection p
General (min 5d straight) Links where bend<150º
6mm
12mm 24mm
110mm 110mm
 8mm 16mm  32mm  115mm  115mm 
 10mm 20mm  40mm  120mm  130mm 
 12mm 24mm  48mm  125mm  160mm 
 16mm 32mm
64mm  130mm  210mm 
 20mm 70mm  140mm  190mm  290mm 
 25mm 87mm  175mm  240mm 365mm
 32mm 112mm  224mm  305mm  465mm 
 40mm 140mm  280mm  380mm  580mm 

NOTE 1
Due to 'spring back' the actual radius of the bend will be slightly greater than half the diameter of the former.


Tolerances on cutting and bending dimensions

The tolerances for cutting and/or bending dimensions shall be in accordance with Table 5 and shall be taken into account when completing the schedule. The end anchorage or the dimension in parentheses in the shape codes specified in Table 3 shall be used to allow for any permissible deviations resulting from cutting and bending.

Table 5 Tolerances
Cutting and bending process
Tolerance (mm)
Cutting of straight lengths (including reinforcement for subsequent bending
 +25, -25
Bending:
≤ 1 000 mm
> 1 000 mm to ≤ 2 000 mm
> 2 000 mm

+5, -5
+5, -10
+5, -25
 Length of bars in fabric     
 ±25 or 0.5% of the length
(whichever is greater)


Radius of bending

Reinforcement to be formed to a radius exceeding that specified in Table 6 shall be supplied straight.

Table 6 Maximum limit for which a preformed radius is required
Bar Size
Radius
6mm
2.5m
8mm
2.75m
10mm
3.5m
12mm
4.25m
16mm
7.5m
20mm
14.0m
25mm
30.0m 
32mm
43.0m 
40mm
58.0m 

NOTE 1 The required curvature may be obtained during placing.
NOTE 2 For shapes with straight and curved lengths (e.g. shape code 12, 13, 22 and 33) the largest practical radius for the production of a continuous curve is 200 mm, and for larger radii the curve may be produced by a series of short straight sections



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