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Re: FIRE - Fire damage to unreinforced brick wall.[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: SEAOC <seaoc(--nospam--at)seaoc.org>
- Subject: Re: FIRE - Fire damage to unreinforced brick wall.
- From: Roger Turk <73527.1356(--nospam--at)compuserve.com>
- Date: 08 Aug 97 12:40:12 EDT
Bruce Resnick wrote: >URM is inherently unsafe in seismic country.< You could have stopped after the 4th word! Being in seismic zone 2, I have been very concerned about the UBC and ACI 530 wall reinforcing requirements for masonry walls that have appeared in the UBC since 1985. These reinforcing requirements (94 UBC 2220.127.116.11) are based on limited tests performed for HUD for *very* small, lightly loaded single story residential structures. Somehow, *someone* extrapolated the results from this very restrictive test to *any* masonry structure and convinced ICBO and ACI to incorporate them in their codes. Regardless of what the codes will permit, I still use the .002A(g) minimum when I design masonry walls. Masonry is a brittle material, and we need the reinforcing to make it behave like a ductile material. Getting back to the original subject, if one wythe has to be replaced, I think that I would consider using WWF or expanded metal in the collar joint and bolting or otherwise connecting the two wythes together so as to provide some ductility to the wall. A. Roger Turk P.E.(Structural) Tucson, Arizona P.S. Not only do we have to confront the masonry reinforcing provisions of the UBC here in Tucson, but local amendments now permit *straw bale* and rammed earth construction in spite of opposition from the Tucson Chapter, SEAOA. Local builders also want to use mud adobe and burnt adobe, which is mud adobe fired at unknown temperatures for an unknown length of time in kilns of various construction just across the border in Mexico.
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