BAR BENDING SHAPE CODES FOR THE CUTTING & BENDING OF REBAR -lceted LCETED INSTITUTE FOR CIVIL ENGINEERS

## Apr 18, 2020

BAR BENDING SHAPE CODES FOR THE CUTTING & BENDING OF STEEL BAR REINFORCEMENT TO BS 8666:2005.

British Standard BS 8666 the ‘Specification for scheduling, dimensioning, bending and cutting of steel reinforcement for concrete’.

You may be noticed in beams & slabs there are number different bent ups, cuttings, and development lengths. Each and every bend and angle provided in the member is the result of design calculation. So you should know bar bending shape codes for easy calculation

Here We Go,

SHAPE CODE 00

LENGTH= A

STOCK LENGTH

SHAPE CODE 11

LENGTH= A + (B) - 0.5r - d

Neither A nor B shall be less than P in Table 2

SHAPE CODE 12

A + (B) - 0.43R - 1.2d

Neither A nor B shall be less than P in Table 2 nor less than (R + 6d)

SHAPE CODE 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.

SHAPE CODE 14

A + (C) - 4d

Neither A nor (C) shall be less than P in Table 2. See Note 1.

SHAPE CODE 15

A + (C)

Neither A nor (C) shall be less than P in Table 2. See Note 1.

SHAPE CODE 21

A + B + (C) - r - 2d

Neither A nor (C) shall be less than P in Table 2.

SHAPE CODE 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 23

A + B + (C) - r - 2d

Neither A nor (C) shall be less than P in Table 2.

SHAPE CODE 24

A + B + (C)

A and (C) are at 90 degrees to one another.

SHAPE CODE 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.

SHAPE CODE 26

A + B + (C)

Neither A nor (C) shall be less than P in Table 2. See Note 1.

SHAPE CODE 27

A + B + (C) - 0.5r - d

Neither A nor (C) shall be less than P in Table 2. See Note 1.

SHAPE CODE 28

A + B + (C) - 0.5r - d

Neither A nor (C) shall be less than P in Table 2. See Note 1.

SHAPE CODE 29

A + B + (C) - r - 2d

Neither A nor (C) shall be less than P in Table 2. See Note 1.

SHAPE CODE 31

A + B + C + (D) - 1.5r - 3d

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

SHAPE CODE 32

A + B + C + (D) - 1.5r - 3d

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

SHAPE CODE 33

2A + 1.7B + 2(C) - 4d

A shall not be less than 12d + 30 mm. 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.

SHAPE CODE 34

A + B + C + (E) - 0.5r - d

Neither A nor (E) shall be less than P in Table 2. See Note 1.

SHAPE CODE 35

A + B + C + (E) - 0.5r - d

Neither A nor (E) shall be less than P in Table 2. See Note 1.

SHAPE CODE 36

A + B + C + (D) - r - 2d

Neither A nor (D) shall be less than P in Table 2. See Note 1.

SHAPE CODE 41

A + B + C + D + (E) - 2r - 4d

Neither A nor (E) shall be less than P in Table 2.
See Shape Code 41 (Flag Link).

A + B + C + D + (E) - 2r - 4d.

Neither A nor (E) shall be less than P in Table 2.

SHAPE CODE 44

A + B + C + D + (E) - 2r - 4d

Neither A nor (E) shall be less than P in Table 2.

SHAPE CODE 46

A + 2B + C + (E)

Neither A nor (E) shall be less than P in Table 2. See Note 1.

SHAPE CODE 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)

SHAPE CODE 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 in Table 2. Where (C) and (D) are to be minimized the following formula may be used: L = 2A + 2B + max(16d, 160)

SHAPE CODE 56

A + B + C + (D) + 2(E) - 2.5r - 5d

(E) and (F) shall be equal and not more than B or C, nor less than P in Table 2.

SHAPE CODE 63

2A + 3B + 2(C) - 3r - 6d

(C) and (D) shall be equal and not more than A or B nor less than P in Table 2. Where (C) and (D) are to be minimized the following formula may be used: L = 2A + 3B + max(14d, 150)

SHAPE CODE 64

A + B + C + 2D + E + (F) - 3r - 6d

Neither A nor (F) shall be less than P in Table 2. See Note 2.

SHAPE CODE 67

A

There is a maximum limit for a preformed radius above which the bar may be supplied straight. This will be confirmed at order.

SHAPE CODE 75

3.142(A - d) + B

Where B is the lap.

SHAPE CODE 77

C x 3.142(A - d)

Where B is greater than A/5 this equation no longer applies, in which case the following formula may be used: L = C((3.142(A - d))squared + B squared) ^0.5

SHAPE CODE 98

A + 2B + C + (D) - 2r - 4d

Isometric Sketch.
Neither C nor (D) shall be less than P in Table 2.

SHAPE CODE 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 dimensioned 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 dimension shall allow for tolerance.

The values for the minimum radius and end projection, r and P respectively, as specified in Table 2, shall apply to all shape codes

The dimensions in parentheses 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 parentheses. The length of straight between two bends shall be at least 4d, see Figure 6. Figure 4, Figure 5 and Figure 6 should be used in the interpretation of ending 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 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 preferable 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 400 mm. 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 the total length. Actual delivery lengths should be by agreement with the supplier.

TABLE 2 - MINIMUM SCHEDULING RADII, FORMER DIAMETERS AND BEND ALLOWANCES.

REFERENCE: BRITISH STANDARD BS 8666:2005

LCETED INSTITUTE FOR CIVIL ENGINEERS

Our Mission To Educate And Keep People Informed By Creating A Trusted Source Of Knowledge Everything Related To Civil Engineering”.