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