Sign board - OVAL- elliptical column
Sign board - OVAL- elliptical column
(OP)
Dear forum members
I am designing a Signboard structure of 150' supported by 4 -oval shaped large columns braced at 3 levels.
1) Is there any reference for oval columns
2) How to design longitudinal and horizontal stiffener (local buckling )
3) How to do fatigue analysis & There is a opening for human to enter and work also
Thanks in advance
M.S.Boobathi
I am designing a Signboard structure of 150' supported by 4 -oval shaped large columns braced at 3 levels.
1) Is there any reference for oval columns
2) How to design longitudinal and horizontal stiffener (local buckling )
3) How to do fatigue analysis & There is a opening for human to enter and work also
Thanks in advance
M.S.Boobathi






RE: Sign board - OVAL- elliptical column
1) I'm not aware of one. References for built up columns may be as close as you get.
2) I've usually stiffened to get b/t ratios down to AISC limits.
3) See AASHTO's guide on signs an luminaries and Tubular Steel Structures by Troitsky.
I find that quite a bit of judgement is required for these kinds if designs. Not particularly helpful, I know.
I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.
RE: Sign board - OVAL- elliptical column
RE: Sign board - OVAL- elliptical column
I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.
RE: Sign board - OVAL- elliptical column
RE: Sign board - OVAL- elliptical column
I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.
RE: Sign board - OVAL- elliptical column
Pipe is fast and easy to fabricate. There are several places around the country that can roll custom, large diameter pipe. You can step it down with telescope splices to keep shipping lengths reasonable. Or use bolted flanges as KootK suggested.
The fabrication costs to make the 'oval' shape structural just seem like they'd be excessive.
RE: Sign board - OVAL- elliptical column
another day in paradise, or is paradise one day closer ?
RE: Sign board - OVAL- elliptical column
I remember I designed a similar pole using API formulas for line piping, but I think AISC now has better coverage for large diameter HSS. For elliptical sections, I figured local buckling based on the tight radius for strong axis bending and on the long radius for weak axis bending. Vibrations and fatigue are big deals. Don't forget bird screens, guano is corrosive.