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RE: Fireproofing[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: "'seaint(--nospam--at)seaint.org'" <seaint(--nospam--at)seaint.org>
- Subject: RE: Fireproofing
- From: "Schwan, Martin K." <SchwanMK(--nospam--at)ci.anchorage.ak.us>
- Date: Tue, 2 Sep 2003 08:49:53 -0800
Ken, most of the metal buildings are type V non rated (V-B in the IBC, V-N in the UBC) per table 601 in the IBC (table 6-A in the UBC) the structural frame is not required to be fireproofed. If it is built as a type V-A (or V-1 hour), then it is required to provide 1 hour fire protection to the structural frame.
Does any one know when is the structure steel
building required fireproofing? Couple years ago I designed an
building consits of concrete over metal deck and supported by metal
joists. The metal joist rested on steel beam. I assumed that the
steels required fireproffing, but it's not. I don't know why it's
not required fireproofing?
I thought I've seen fireproofing weighing anywhere from 15 pcf up to 40 pcf (Grace FP Products). Assuming a W18x35, surface area (minus top of top flange) = 4.34 sf/ft (AISC Manual). For each inch of FP, weight of FP = 5.5 plf to 14.5 plf. Depending on how much FP, average weight is probably at most in the 2 to 3 psf range and I generally lump that into the "Miscellaneous" load. Special situations might require a closer look.
practically zero. If the spray on fire protection is more than two or three pounds per linear foot on a 24" beam I would be surprised. Typically spray on is accounted for in the miscellaneous loading. If the spray on is a factor in the beam design, you are cutting things way too close. :-)
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