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RE: Fire ratings to UBC 1997

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Many thanks Charlie, and pass on a thank you to Farid.

Mark Geoghegan
Honolulu, HI

             > -----Original Message-----
             > From: Carter, Charlie [mailto:carter(--nospam--at)aisc.org]
             > Sent: Friday, January 31, 2003 9:20 AM
             > To: 'seaint(--nospam--at)seaint.org'
             > Subject: FW: Fire ratings to UBC 1997
             > 
             > 
             > In answer to the question below, I have the 
             > following courtesy of my fire
             > engineering colleague Farid Alfawakhiri here at AISC.
             > 
             > Charlie
             > 
             > ********************
             > Open parking structures category is recognized by 
             > all model codes in the US.
             > For non-combustible construction, no fire protection 
             > (0 hours rating) would
             > be required, if the following limits are observed
             > 
             > IBC : 50,000 sq.ft area per tier (max) ; 8 tiers 
             > (max) ; 2 sides (min) open
             > 20 % (min) of wall area of entire perimeter
             > NBC : 50,000 sq.ft area per tier (max) ; 8 tiers 
             > (max) ; 2 sides (min) open
             > 40 % (min) of wall area of entire perimeter
             > SBC : 400,000 sq.ft area per tier (max) ; 8 tiers 
             > (max) ; 2 sides (min) open
             > 50 % (min) of wall area of open sides
             > UBC : 30,000 sq.ft area per tier (max) ; 8 tiers 
             > (max) ; 2 sides (min) open
             > 20 % (min) of wall area of entire perimeter
             > 
             > Note that while IBC, NBC and UBC have a 
             > significantly lower value than SBC,
             > IBC, NBC and UBC allow unlimited area for 
             > non-combustible unprotected (0
             > hours rating) open parking structures if 50% (min.) 
             > of the wall area on all
             > sides is open, the distance from any point on the 
             > floor is within 200 ft to
             > the nearest opening, and the height of the structure 
             > is within 75 ft.
             > 
             > Please note that these liberal limits are in 
             > recognition of the very low
             > fire hazard levels in open parking structures, 
             > mainly due to good
             > ventilation. These rules do not apply to closed parking.
             > 
             > ________________________
             > 
             > Farid Alfawakhiri, Ph.D.
             > Senior Engineer, Fire Design
             > 312-670-5441 (phone)
             > 312-644-4226 (fax)
             > alfawakhiri(--nospam--at)aisc.org
             >  
             > American Institute of Steel Construction, Inc.
             > One East Wacker Drive, Suite 3100
             > Chicago, IL 60601-2000
             > _____________________________________
             >  
             > 
             > -----Original Message-----
             > From: Carter, Charlie 
             > Sent: Wednesday, January 29, 2003 05:54
             > To: Alfawakhiri, Farid
             > Subject: FW: Fire ratings to UBC 1997
             > 
             > 
             > Please help me answer this. You have to be a 
             > subscriber to post messages to
             > the SEAINT list serv, so send it to me and I will post it.
             > 
             > Charlie
             > 
             > -----Original Message-----
             > From: Mark Geoghegan [mailto:structuraltech.vsl(--nospam--at)verizon.net]
             > Sent: Tuesday, January 28, 2003 7:35 PM
             > To: seaint(--nospam--at)seaint.org
             > Subject: Fire ratings to UBC 1997
             > 
             > 
             > I need some assistance/comments with the following:
             > 
             > 4 level parking structure, open on all 4 sides, 
             > approx 22,000 SF per floor,
             > PT concrete flat plate construction. Stand alone 
             > parking structure, no
             > structure above, none adjacent. Structure is 25 years old.
             > 
             > To UBC 1997 its Use and Occupancy is GROUP S,  
             > Division 4, Open Parking
             > Garage.
             > 
             > Based upon the Use and Occupancy and Floor Area and 
             > Building Height I have
             > determined it is Type II-N construction (correct?).
             > 
             > It is up for repair/strengthening - if structural 
             > steel or other external
             > strengthening systems are selected as a 
             > repair/strengthening option to
             > support the concrete slabs, does the external 
             > strengthening system need to
             > be fire protected? Or does it just have to be 
             > "non-combustible" materials?
             > 
             > I say no fire protection is required because it is 
             > Type II-N - but I welcome
             > comments.
             > 
             > Many thanks
             > 
             > Mark Geoghegan
             > Honolulu, HI
             > 
             > 
             > 
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