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Fire rating for Concrete Filled HSS Columns???

Fire rating for Concrete Filled HSS Columns???

Fire rating for Concrete Filled HSS Columns???

(OP)
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

RE: Fire rating for Concrete Filled HSS Columns???

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!

RE: Fire rating for Concrete Filled HSS Columns???

(OP)
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.

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