method of measurement of bending dimensions
TRANSCRIPT
Method of measurement of bending dimensions
Total length of bar (L) measured along centre line
ShapeCode
20
A
ShapeCode
32
A+h
ShapeCode
33
A+2h
ShapeCode
34
A+n
Where the overall dimension of the bob is critical, use shape code 37.
ShapeCode
35
A+2n
Where the overall dimension of either bob is critical, do not use this shape code.
ShapeCode
37
A+(B)-½r-d
This formula is approximate. Where r is greater than the minimum value in table 3 BS 4466 1989, use shape code 51.
ShapeCode
38
A+B+(C)-r-2d
Method of measurement of bending dimensions
Total length of bar (L) measured along centre line
ShapeCode
41
If angles with the horizontal are 45° or less:
A+B+(C)
see note 4.
ShapeCode
43
If angles with the horizontal are 45° or less:
A+2B+C+(E)
see note 4.
ShapeCode
51
A+(B)-½R-d
This formula is approximate, if R is minimum, use shape 37. If R is greater than 200mm, see note 2 to clause 10 BS 4466 1989.
ShapeCode
61
2(A+B)+12d
Neither A nor B are to be less than 12d or 150mm, whichever is the greater, for grade 460 in sizes not exceeding 20 mm nor less than 14d for sizes of 25mm and over.
Neither A nor B are to be less than 10d for grade 250 with a minimum value of A and B of 100mm. See note 3.
ShapeCode
62
If angle with horizontal is 45° or less.
A+(C)
See note 4.
ShapeCode
82
2A+3B+18d
If B is greater than 400+2d, see note 2 to clause 10 BS 4466 1989.
See note 3
Method of measurement of bending dimensions
Total length of bar (L) measured along centre line
ShapeCode
39
A+0.57B+(C)-1.57d
If B is greater than 400+2d, see note 2 to clause 10 BS 4466 1989
ShapeCode
42
If angle with horizontal is 45° or less.
A+B+C+n
See note 4.
ShapeCode
45
If angle with horizontal is 45° or less.
A+B+(C)-½r-d
See note 4.
ShapeCode
49
If angle with horizontal is 45° or less.
A+B+(C)
See note 4.
ShapeCode
52
A+B+C+(D)-1½r-3d
ShapeCode
53
A+B+C+D+(E)-2r-4d
ShapeCode
54
A+B+(C)-r-2d
ShapeCode
55
A+B+C+D+(E)-2r-4d
ShapeCode
65
A
These bars will be supplied straight when the radius is greater than that given in table 5 of BS 4466 1989
Method of measurement of bending dimensions
Total length of bar (L) measured along centre line
ShapeCode
77
2A+B+20d
See note 3
ShapeCode
78
2A+B+C+3d
See note 3
ShapeCode
79
2A+3B+10d
Neither A nor B shall be less than 12d or 150mm, whichever is the greater, for grade 460 in sizes not exceeding 20mm not less than 14d for sizes of 25mm and over.
Neither A nor B are to be less than 10d for grade 250 with a minimum value of A and B of 100mm. See note 3
ShapeCode
85
A+B+0.57C+(D)-½r-2.57d
If C is greater than 400+2d see note 2 to clause 10 BS 4466 1989
ShapeCode
87
where B is not greater than A/5.
C⁄B π (A-d) (L<12m)
Where A is the external diameter of helix (in mm)B is the pitch of helix (in mm)C is the overall height of helix (in mm).
Where B is greater than A/5 the formula does not apply.
There shall be at least two full turns in the helix.Note, unless A is small relative to d, this shape is fabricated in a closed form and pulled to shape on site.
BAR MASS per linear metre (kg/m) :-
50mm: 15.413kg/m 40mm: 9.864kg/m 32mm: 6.313kg/m 25mm: 3.854kg/m 20mm: 2.466kg/m
16mm: 1.579kg/m 12mm: 0.888kg/m 10mm: 0.616kg/m 8mm: 0.395kg/m 6mm: 0.222kg/m
BS 4466 - Quick Navigation go back
Minimum former radii, bend and hook allowances
Bar Size
Grade 250 bars complying with the requirements of BS 4449 (type and grade R) and
BS 6744 type S
d r † n h
6†‡ 12 100 100
Bar Size
Grade 460 bars complying with the requirements of BS 4449 (type and grade T) and
BS 6744 type S
d r † n h
6†‡ 18 100 100
Fabric Size
Sheet Fabric complying with the requirements of
BS 4483standard size 4.8m x
2.4m
d r † n h
8 16 100 100
10 20 100 100
12 24 100 110
16 32 100 150
20‡ 40 100 180
25‡ 50 130 230
32‡ 64 160 290
40‡ 80 200 360
50‡ 100 250 450
8 24 100 100
10 30 100 110
12 36 100 140
16 48 100 180
20‡ 60 110 220
25‡ 100 180 350
32‡ 128 230 450
40‡ 160 280 560
50‡ 200 350 700
5 15 100 100
6 18 100 100
7 21 100 100
8 24 100 100
9 27 120 135
10 30 120 135
12 36 130 145
**The use of hooks as end anchorages is not normally necessary with deformed bars.
† It should be borne in mind that special precautions such as reducing the speed of bending or increasing the radius of bending may necessary in cold weather. For bending and rebending on site refer to BS 8110. ‡ Non-preferred size for grade 250 bars. • Non-preferred size for grade 460 bars.
NOTE: These radii are the minimum radii of the formers for material complying with the relevant British standard. Certain design situations may call for larger radii and for these the recommendations in BS 8100 should be followed.
Radius of bending:- maximum values requiring bending
Bar Size 6 8 10 12 16 20 25 32 40
Radius (m) 2.5 2.75 3.5 4.25 7.5 14 30 43 58
N.B. Bars to be formed to a radius exceeding the above dimensions will be supplied straight.