General Information
Tube Struts can be fitted between Purlins, Rails or Cee members and help resist the compressive forces exerted by the cold-rolled sections.
There are 3 distinct types as shown in the diagram below. They are distinguished by the type of end connector.
Types of Tube Struts
Connection details
Standard Tube Strut Joint Detail
The length of the standard Tube Strut is 2mm less than the purlin centres.
Joint Detail for the DP-TS145 (used with the 145 deep ProSigma+ section only)
The DP-TS145 has an extended spigot to accommodate the Tube Strut Spacer (DP-SP145) (shown in red in the image above). This arrangement is necessary due to the narrow web width of the 145mm ProSigma section. The length is the purlin centres less 12mm.
Connection detail at bottom of run
Clamp Plates are used at the bottom of a run of sections greater than 145mm. Clamp Plates cannot be used with the 145 ProSigma+ as the web is too narrow.
Connection detail at top of run
Connection detail at bottom of run (DP-TS145 only)
Each run of Tube Struts for the 145 ProSigma+ section should be finished using a Tube Strut Spacer (DP-SP145) as shown. Clamp Plates are too wide to fit into the web of this section. A nut and washer secures the joint.
Tube Strut connection to counterformed members
Tube Struts may be used in conjunction with counterformed holes where a flush finish is required.
Duggan Profiles Tube Struts have been tested to EN1993-1-3 to determine their range of use. Tube Struts resist axially applied compressive loadings and are therefore prone to buckling if the critical buckling load is reached. The load which may be safely applied varies with length and the table below outlines safe working loads for a variety of lengths. The same values apply irrespective of the type of Tube Strut used. The lengths indicated correspond to the “LENGTH” dimension indicated in the diagram in the “Types of Tube Strut” section above.
| Tube Strut Length (mm) | Working Buckling Resistance (N) |
|---|---|
| 1000 | 4707 |
| 1200 | 4178 |
| 1400 | 3653 |
| 1600 | 3163 |
| 1800 | 2729 |
| 2000 | 2359 |
| 2200 | 2047 |
How to order
The product code for each type of strut along with a drawing are included in the table below. The quantity required along with the length as indicated on the drawing must also be provided. Clamp Plates and Tube Strut Spacers if required must also be ordered as none are supplied automatically.
ProSigma+ Tube strut products codes and drawings:
| Code: | Description: | Length | PDF File |
|---|---|---|---|
| DP-TS | Tube Strut used with SIGMA+ 175 – 325 and all Cee Sections. Male/Female Ends | Cold-rolled centres – 2mm |  |
| DP-TS145 | Tube Strut used with SIGMA+ 145 sections only. Male/Female Ends. 1 Tube Strut Spacer required per strut. | Cold-rolled centres – 12mm | |
| DP-TSFF | Tube Strut used where flush finish ends are required. Used with counterformed Cee sections. Female/Female Ends | Cold-rolled centres – 2mm | |