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Steel Columns Tapered or Straight?
I've seen metal buildings use both tapered and straight columns. What is the benefit of using one over the other? Can you provide a detail answer along with the assumptions used in these types of designs. Please do not answer "because one is moment resisting", without you assumptions or explanation.
http://www.gensteel.com/primary-frames.htm
Here is a link to see what Im talking about. Typically the column/rafter joint at the "knee" is beefier than at the bottom of the column for the tapered columns and the same size for straight columns.
Tapered is for aesthetics mostly, but a bit of structural reasons, as the top of the column can be thinner than the top by a bit, as the top doesn't have to support the weight of the rest of the column as well as the load. The bottom has to support both the column and the load.
But a straight column is easier to make, and with strong materials, the difference noted above is too small to offset the ease of manufacture of the straight column.
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