Large Diameter Round HSS

[SkiisAndBikes]

I am designing a large cantilevered 'sign type' structure. The Canadian Steel Handbook provides properties and dimensions for round HSS sections up to 16" in diameter, however, prelim calcs indicate a larger diamter is required. Does anyone know where I can source information on larger diameter round HSS sections?

 

[CTW]

The AISC manual lists the largest size as 20x0.500. Go here

http://www.aisc.org/steel/searchForm.aspx?id=2044

to check availability. If you need something larger than 20" diameter, then pipe may be your best bet.

 

[csd72]

You can get custom rolled ones up to about 70" diameter by 1.25" thick and they go in increments of 2". minimum thickness is 3/8" for smaller ones and 5/8" for larger ones.

These are available in 35ksi steel as standard but can be ordered in 50ksi if necessary.

There are literally thousands of signs in the US made with these large poles so manufacturers will not be hard for the builder to find.

 

[enginerding]

Often times API 5L pipes are used. They come in a variety of strengths from Fy = 35 ksi to 70 ksi. Also ASTM A252 pipe can be used. 35 and 45 ksi.

 

[Ussuri]

API pipe (grades X52, X65), my catalogue has sizes up to 48 inch diameter and 2 inch wall thickness

 

[JedClampett]

I'm not sure if I'm repeating information from above, but A53 pipe comes in very large diameters and heavy thicknesses. As a matter of fact, if you look at the state DOT websites (TxDOT, ADOT, FDOT, etc.) they have cantilever sign details shown with very large, schedule 80 or 160, pipes bent into "L" shapes to support signs. They're a good resource for what can be done.
And if (when) the contractor looks at you like you're stupid, you can just say, "...that's how ____ DOT does it."

 

[SkiisAndBikes]

Thank you all. That was exactly the information that I was looking for.

 

[azcats]

I'm employed in the sign business in design and fabrication and deal with pipes daily.

To save yourself some hassle use more common diameters. The most common sizes we use are 16, 20, 24, 30, 36, 42 and 48. I'll typically vary my thickness in 1/16" increments. Sizes like 22, 26 and 32 are available, but not as common and less likely for a fabricator to source easily.

 

[csd72]

One thing I did not make obvious is that thick walls cannot be rolled to small diameters.

 

[MiketheEngineer]

Can you use more supports?? Sometimes much cheaper than a custom rolled section

 

[JStephen]

Calling a local supplier or fabricator may be helpful. Otherwise, you're basing your design on what was available 3,000 miles away 5 years ago.

 

[csd72]

We designed them the same way regardless of where they were- NYC, new england, LA, New orleans, texas, miami. Never had a complaint that they were too difficult to obtain.