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cmu firewall design
i need to design two 4 hour cmu firewalls (due to building area separation req'mts)for a four story, wood framed, assisted living building in florida. per fbc, a firewall must have "sufficient structural stability under fire conditions to allow collapse of the construction on either side without collapse of the wall." one fire wall will run parallel to the framing on either side, the other will have framing bearing on ledgers on one side only. i verifed with the local building official that a 4-hour cmu load bearing wall (ul901) can use the framing on either side to brace the wall. i'm assuming that if the framing burns on one side, it will simple drop away from the wall & not impart any additional forces on the wall. the architect wants to use breakawy clips, but i don't see how to do that and achieve adequate support for the framing members. am i okay in my assumption that if the wood framing collapses on one side, it will not impact the wall? if not, what kind of forces should i design for? the architect wants an 8" wall if possible, which works for my asssumptions.
thanks for any help!
this has been discussed before - check out these previous threads:
here's another one....

2009-09-08, 09:32 AM	#1
huangyhg 超级版主注册日期: 04-03 帖子: 18592 精华: 36 现金: 249466 标准币资产: 1080358888 标准币	cmu firewall design cmu firewall design i need to design two 4 hour cmu firewalls (due to building area separation req'mts)for a four story, wood framed, assisted living building in florida. per fbc, a firewall must have "sufficient structural stability under fire conditions to allow collapse of the construction on either side without collapse of the wall." one fire wall will run parallel to the framing on either side, the other will have framing bearing on ledgers on one side only. i verifed with the local building official that a 4-hour cmu load bearing wall (ul901) can use the framing on either side to brace the wall. i'm assuming that if the framing burns on one side, it will simple drop away from the wall & not impart any additional forces on the wall. the architect wants to use breakawy clips, but i don't see how to do that and achieve adequate support for the framing members. am i okay in my assumption that if the wood framing collapses on one side, it will not impact the wall? if not, what kind of forces should i design for? the architect wants an 8" wall if possible, which works for my asssumptions. thanks for any help! this has been discussed before - check out these previous threads: here's another one.... __________________ 借用达朗贝尔的名言：前进吧，你会得到信心! [url="http://www.dimcax.com"]几何尺寸与公差标准[/url]