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40 mm Centre to Centre

BEARING BAR SIZE IN MM.

SPAN

 

300

450

600

750

900

1050

1200

1350

1500

1650

1800

1950

2100

2250

2400

25 x 3

U
D

11000
0.6

4880
1.4

2740
2.6

1760
3.9

1230
5.9

900
7.9

680
10.0

 

Unit Stress - 1650 kg/sq. m.

C
D

1660
0.5

1100
1.1

820
2.0

660
3.1

550
4.3

470
6.1

410
8.0

25 x 5

U
D

18300
0.6

8100
1.4

4560
2.5

2920
3.9

2020
5.6

1490
7.5

1150
10.0

850
12.7

U-Uniformly distributed load in kg./sq. m.
C-Concentrated load in Kg/m. width at mid-span.
D-Deflection in millimeters.

C
D

2740
0.5

1820
1.1

1370
2.0

1100
3.1

910
4.3

780
6.1

690
8.0

570
10.5

30 x 3

U
D

15800
0.5

7100
1.1

3950
2.1

2520
3.2

1750
4.3

1290
5.4

990
6.5

780
7.2

680
8.3

600
12.9

Spans to left of heavy line produce a deflection of 6 mm of less under a uniform load of 500 kg/sq. m. This deflection is recommended as per  BS 4592-1970

C
D

2370
0.4

1580
0.9

1180
1.6

950
2.6

790
3.7

670
5.0

590
6.6

520
8.3

410
9.4

400
10.3

30 x 5

U
D

22800
0.5

11700
1.1

6580
2.1

4210
3.2

2920
4.3

2150
5.4

1610
6.5

1300
7.2

1050
10.8

860
12.9

C
D

3950
0.4

2630
0.9

1970
1.6

1580
2.6

1310
3.7

1130
5.0

980
6.6

870
8.3

780
9.4

710
13.3

35 x 3

U
D

21500
0.4

9570
1.0

5320
1.8

3440
2.8

2390
3.9

1760
5.2

1340
7.1

1060
9.0

860
11.1

710
13.5

C
D

3220
0.3

2150
0.8

1610
1.4

1290
2.3

1070
3.2

920
4.3

800
5.7

710
7.2

640
8.6

580
10.8

35 x 5

U
D

35800
0.4

1590
1.0

8900
1.8

5700
2.8

3980
3.9

2920
5.2

2240
7.1

1770
9.0

1430
11.1

1180
10.5

990
16.6

840
19.6

 

C
D

5380
0.3

3580
0.8

2680
1.4

2150
2.3

1790
3.2

1530
4.3

1340
5.7

1190
7.2

1070
8.6

980
10.8

890
13.1

820
15.7

40 x 3

U
D

28100
0.3

12500
0.8

7100
1.5

4490
2.4

3100
3.5

2280
4.8

1740
6.2

1380
7.9

1120
9.7

920
11.8

770
13.8

660
16.4

C
D

4200
0.3

2800
0.7

2110
1.2

1690
2.1

1400
2.8

1200
3.9

1050
4.9

930
6.3

840
7.7

760
9.4

700
11.2

640
13.0

40 x 5

U
D

47200
0.3

20800
0.8

11700
1.5

7500
2.4

5200
3.5

3820
4.8

2920
6.2

2310
7.9

1860
9.7

1650
11.8

1230
13.8

1100
16.4

950
19.5

830
20.6

 

C
D

7000
0.3

4680
0.7

3510
1.2

2800
2.1

2330
2.8

2010
3.9

1750
4.9

1560
6.3

1400
7.7

1270
9.4

1170
11.2

1080
13.0

1000
15.1

930
17.3

45 x 5

U
D

59200
0.3

26300
0.8

14800
1.3

9500
2.2

6500
3.1

4830
4.2

3700
5.6

2920
7.0

2360
8.6

1950
10.5

1640
12.4

1400
14.6

1210
16.9

1050
19.9

960
22.1

C
D

8900
0.2

5900
0.6

4490
1.0

3550
1.7

2960
2.5

2530
3.4

2220
4.4

1970
5.6

1760
6.9

1610
8.3

1480
9.9

1370
11.7

1270
13.5

1180
15.5

1110
17.7

50 x 5

U
D

73100
0.3

32500
0.7

18300
1.2

11700
2.0

8100
2.8

5900
3.8

4570
5.0

3610
6.3

2920
7.8

2410
9.4

2030
11.2

1730
13.2

1490
15.2

1300
17.5

1140
19.9

C
D

10900
0.2

7500
0.6

5500
1.0

4380
1.5

3660
2.2

3130
3.1

2740
4.0

2430
5.0

2190
6.2

1990
7.5

1830
9.0

1690
10.5

1560
12.1

1460
14.0

13.7
15.9

For hand made gratings, multiply the above figures with the following load factor :

TYPE R-4/RR-4 ZZ-4 R-3/RR-3 ZZ-3
LOAD FACTOR 0.8 0.95 1.1 1.25

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