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Re: ASCE 7 Section

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My understanding is that no, you would not be able to use OMF.  Are you trying to use masonry on 3 sides, and OMF at a storefront?  I would do a 3-sided box, or use the frame on the open front, but the drift would have to be somewhat compatible with the masonry walls.  Say no more than 3x the drift of masonry...
i believe the intent of the provision you noted is for a metal storage building, but i could also be way off....

On Thu, Feb 19, 2009 at 9:33 AM, Bill Allen <t.w.allen(--nospam--at)> wrote:

If I have a one story building (h < 25 ft.) in Seismic Design Category D consisting of masonry exterior walls and a wood roof (< 20 PSF DL), can I use an OMF? The last sentence says I cannot have exterior walls weighing more than 20 PSF 35 feet above the base, but I have no walls 35 feet above the base. There may be a mezzanine in this area but the OMF would still be one story. The wall above the OMF would probably be a wood framed shear wall.


Table 12.2-1 says OMFs are NP, but footnote h leads me to section





T. William (Bill) Allen, S.E.


Consulting Structural Engineers
V (949) 248-8588 F(949) 209-2509


David Topete, SE