Bill Polhemus wrote: "IIRC UBC 1997 and SBC 1999 do not allow the increase
for wind design."
Actually SBC 1999 Section 2313.2.4 does allow the 40% increase - this is
where I first encountered it. The SBC 1999 Commentary refers to the change
in load factors for wood, but it is not clear what load factors they are
Eric Ober wrote: "The factor of safety for wind and seismic loading are
different. I believe that the FS for wind is 2.0 while that for seismic is
The SBC Commentary does note that this 1.4 factor is based on a "change in
load factors for wood structural panels from 2.8 to 2.0 (2.8/2.0 = 1.4)".
But what load factors / factors of safety are these referring to, i.e. where
are they defined and how are they applied to allowable stresses? Are they in
addition to the 1/3 allowable stress increase?
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