question: W-shape versus "American standard shape (S-Shape)" and flange tapering in genera
question: W-shape versus "American standard shape (S-Shape)" and flange tapering in genera
(OP)
I just can't seem to find any answers on my own to the following basic question:
Why were the flanges tapered on the S-shape? Why has the W-shape essentially replaced it in modern construction?
I believe modern channels are still tapered. Again, why?
Why were the flanges tapered on the S-shape? Why has the W-shape essentially replaced it in modern construction?
I believe modern channels are still tapered. Again, why?






RE: question: W-shape versus "American standard shape (S-Shape)" and flange tapering in genera
RE: question: W-shape versus "American standard shape (S-Shape)" and flange tapering in genera
As rolling mills evolved, there was movement of both the web rollers and the flange rollers and all dimensions could be varied for the most effective section.
Early cranes accommodated the 'bevelled' flanges and still do... because cranes often have high shear loads, the thicker web is a bit of an advantage. You can easily get equipment that works well with W sections as well as S sections.
Dik
RE: question: W-shape versus "American standard shape (S-Shape)" and flange tapering in genera
Whether "modern" channels are tapered or not depends on where you are, I think. In Australia, we have parallel flange channels (PFC) for the bigger ones, and tapered flange channels (TFC) for the little ones.