7 Kudos

Doubled cold formed profile

Status: New Idea
by Active Contributor legar on ‎03-25-2013 04:29 AM

During multi span purlin (girt) design of cold formed sections (Z, C, Sigma) in practice we use overlap (doubled) section over supports.

Purlin design scheme.png


Doubled thin-walled profiles.png

It will be very useful to have a possibility to declare dobled section which all properties will be a sum of properties of both sections, eg.:

Ix = Ix1 + Ix2

Iy = Iy1 + Iy2

Ax = Ax1 + Ax2

and so on...


Of course both profies should be from the same profiles family with the only difference in profiles thickness eg.:

C300x1.5 + C300x2.5; Z250x2.0 + Z250x2.5 and so on...

by Active Contributor legar on ‎03-25-2013 11:38 PM

Of course possible should be 2 same profiles :smileyhappy::

2xC300x2.5; 2xZ250x1.8 and so on...


Some examples:

1. Purlin doubled over roof rafter:

Purlin doubled over support.png


2.Girt doubled over frame column:

Girt doubled over support.png

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