Racking and general structures

NB.When designing structures care must be taken to ensure that the load on any one grub screw does not exceed 900kg.

For further help in designing structures using FastClamp
please contact our technical department.

Racking and general structures can be constructed using FastClamp fittings. Care must be taken to ensure that the tube size selected is adequate for the loads anticipated. To help with the selection of the correct tube, Table 1 Horizontal tube load capacity provides the uniformly distributed loads that can be supported between upright posts assuming that the load is supported by two tubes. These loads are calculated based on the maximum bending movement for the tube.

Table 2 Vertical tube load capacity provides the load capacity for single upright posts with various unsupported lengths. These loads are based on the compression strength and buckling loads of the CHS tube.

Handrail

Handrail is the most common form of structure that is built with FastClamp fittings and requires careful consideration to meet required design loadings.Design loads are usually specified, however if unsure BS 5395 and BS 4592 are good reference documents.

The loading capacity of any handrail structure is determined principally by the diameter, thickness and frequency of its Uprights.

Table 3 contains our recommendations to safely meet the stated design loads based on themaximumpermissible bendingmoment of theUpright tube.

Horizontal tubes load capacity

Uniformally distributed load in Kg using two horizontal tubes

Tube Ø and Grade

Span
(metres)

33.7 x 3.2mm
Grade S275
42.4 x 3.2mm
Grade S275
42.4 x 4.0mm
Grade S275
48.3 x 3.2mm
Grade S275
48.3 x 4.0mm
Grade S275
48.3 x 5.0mm
Grade S355
0.5 1257 2108 2490 2818 3347 4910
0.6 1047 1757 2075 2349 2789 4092
0.7 898 1506 1778 2013 2391 3507
0.8 785 1317 1556 1761 2092 3069
0.9 698 1171 1383 1566 1859 2728
1.0 628 1054 1245 1409 1673 2455
1.1 571 958 1132 1281 1521 2232
1.2 524 878 1037 1174 1394 2046
1.3 483 811 958 1084 1287 1888
1.4 449 753 889 1007 1195 1754
1.5 419 703 830 939 1116 1637
1.6 393 659 778 881 1046 1534
1.7 370 620 732 829 984 1444
1.8 349 586 692 783 930 1364
1.9 331 555 655 742 881 1292
2.0 314 527 622 705 837 1228
2.1   502 593 671 797 1169
2.2   479 566 641 761 1116
2.3   458 541 613 728 1067
2.4   439 519 587 697 1023
2.5   422 498 564 669 982
2.6     479 542 644 944
2.7     461 522 620 909
2.8     445 503 598 877
2.9     429 486 577 847
3.0     415 470 558 818
Table 1

Vertical Strut load capacity

Vertical load in Kg per strut

Tube Ø and Grade

Strut Lenght
(metres)
33.7 x 3.2mm
Grade S275
42.4 x 3.2mm
Grade S275
42.4 x 4.0mm
Grade S275
48.3 x 3.2mm
Grade S275
48.3 x 4.0mm
Grade S275
48.3 x 5.0mm
Grade S355
0.3 2876 3803 4657 4437 5410 9244
0.4 2688 3669 4493 4314 5296 8967
0.5 2438 3482 4263 4190 5107 8551
0.6 2084 3240 3935 3975 4842 7996
0.7 1729 2892 3509 3697 4502 7118
0.8 1417 2571 3083 3389 4086 6148
0.9 1167 2223 2623 3050 3632 5223
1.0 959 1901 2263 2650 3178 4484
1.1 813 1634 1935 2342 2800 3790
1.2 688 1419 1672 2034 2421 3236
1.3 583 1232 1443 1787 2119 2773
1.4 521 1071 1246 1571 1854 2450
1.5 458 937 1115 1387 1665 2172
1.6 396 830 984 1232 1475 1895
1.7 354 750 853 1109 1324 1664
1.8 313 670 787 986 1173 1525
1.9 292 589 689 894 1059 1387
2.0 229 536 623 801 984 1387
Table 2

 

Handrail is the most common form of structure that is built with FastClamp fittings and requires careful consideration to meet required design loadings.Design loads are usually specified, however if unsure BS 5395 and BS 4592 are good reference documents.

The loading capacity of any handrail structure is determined principally by the diameter, thickness and frequency of its Uprights.

This table contains our recommendations to safely meet the stated design loads based on the maximum permissible bending moment of theUpright tube.

Handrail load capacity

Maximum Upright Centres (mm)

Tube Ø and Grade

900 mm high

Design
Load
33.7 x 3.2mm
Grade S275
42.4 x 3.2mm
Grade S275
42.4 x 4.0mm
Grade S275
48.3 x 3.2mm
Grade S275
48.3 x 4.0mm
Grade S275
48.3 x 5.0mm
Grade S355
360 N/m 814 1369 1595 1828 2584 3052
740 N/m Not Suitable 666 776 889 1257 2229
1500 N/m Not Suitable Not Suitable Not Suitable 439 620 1100

1000 mm high

360 N/m 732 1232 1435 1645 2326 2930
740 N/m Not Suitable 599 698 800 1131 2006
1500 N/m Not Suitable Not Suitable Not Suitable Not Suitable 558 990

1100 mm high

360 N/m 666 1120 1305 1496 2114 2778
740 N/m Not Suitable 545 635 728 1028 1824
1500 N/m Not Suitable Not Suitable Not Suitable Not Suitable 507 900
Table 3            

Rails need only be 3.2mm thick and the same diameter as the upright.

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