Call out for Frames with tapered cross section
Call out for Frames with tapered cross section
(OP)
Folks,
Is it standard to call out on drawings the section dimensions for a tapered frame, or is it more appropriate to call out the wide flange section to be used to form the shape, and the taper angle? I'm not sure how much info the fabricator will require
thanks for the input
DRW
Is it standard to call out on drawings the section dimensions for a tapered frame, or is it more appropriate to call out the wide flange section to be used to form the shape, and the taper angle? I'm not sure how much info the fabricator will require
thanks for the input
DRW





RE: Call out for Frames with tapered cross section
RE: Call out for Frames with tapered cross section
To make a tapered section out of plate, the web still has to be cut on the taper angle, and then the welds to connect the flange to the web (even if fillet stitched with no prep). This would seem like more work, and more potential wastage of plate for the web & the flanges.
I wonder then, If it is left to the devices of the fabricator to choose the best method, then I would assume that they would design their own weld requirements (and of course send off the shop drawings for acceptance).
DRW
RE: Call out for Frames with tapered cross section
RE: Call out for Frames with tapered cross section
For this case, fatigue won't be an issue - only wind loading present, and the stresses associated with that load case are low enough that it wont be past any fatigue threshold - high cycle stress is probably 5% yield at most. Snow governs the design of this member.
DRW
RE: Call out for Frames with tapered cross section
RE: Call out for Frames with tapered cross section
Having said all that, you could just use two WTs, and fillet them such that the webs are offset, that way you don’t have to trim anything, just form up the bevel angle - however you do have a lovely seam in your web then, an every so slightly eccentric section, and still some ineffective steel where the TEEs lap that you're going to pay for.
DRW
RE: Call out for Frames with tapered cross section