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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
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