Fire rating for Concrete Filled HSS Columns???

[structuresguy]

Hi

I am looking for some published fire ratings for concrete filled HSS columns. My architect is pushing me for a UL assembly number, but since it is not a proprietary system, there is not one. He is giving me grief as he thinks he needs a UL number. Does anyone know of any official body (code, institute, etc) which has published fire ratings for composite HSS columns. I need a 1 hour rating on an unprotected 8" HSS column.

Thanks in advance.

Andrew

 

[jike]

I know of no fire rating that you can achieve with bare steel (concrete filled or not).

I believe you have 4 options:

Use Lally column
Refer to

http://www.deanlally.com/

Box the column in with a rated drywall assembly.

Spray on fire proofing on the column and then box the column in with a unrated drywall assembly to achieve achitectural appearance.

Use intumescent paint on the column.

I hope this helps!

 

[structuresguy]

Well, I know that research done over the last decade or more has shown that filling a tube column with concrete can achieve up to at least a 3 hour rating. And I know of several projects which have used unprotected filled columns where fire ratings are required. What I can not find is any published ratings for these columns.

Think of metal deck. If you put enough concrete over it, you can easily get a fire rating even if unprotected.

Unfortunately, any kind of covering is not acceptable. And intumescent paint may or may not be an option.

Thanks.

 

[KKnTN]

You may wish to check out this article if you haven't already.

http://www.aisc.org/Template.cfm?Se...=/Ecommerce/ProductDisplay.cfm&ProductID=1099