> I have a question regarding the standard practice especially in
> California of considering the uplift and horizontal loads simultaneously
> for wood-framed construction. First of all in the previous UBC codes
> (say from UBC 1982 to UBC 1977/CBC 2001) considering the uplift and
> horizontal wind loads acting simultaneously on a building was not
> explicitly addressed and not mandatory required. Even though text books
> and references have been indicating that these loads are acting
> simultaneously but it seems to me that in our practice we just consider
> them separately. We use the horizontal wind load to design our lateral
> force resisting systems and the uplift wind load is basically a
> detailing issue by anchoring roof framing to the top level of the
> building. We never have any uplift problems for the buildings that we
> designed and also we never have any questions from any building
> departments. In the ASCE 7-05 both the Simplified Method and Analytical
> Method require, explicitly with diaphragms, that these two loads are to
> be considered simultaneously. Will there still be a difference between
> standard practice and code requirements for wood-framed construction?
> Anyone can give me some insight and comments on this issue?
> Thanks.
>
>
It seems that current practice is to uncouple the vertical and
horizontal forces. Years ago it was explained to me that the load
combination 0.6DL+/- Wind took into account the uplift forces acting
concurrently with the horizontal forces by using 60% of the dead load.
Yet using ASCE 7 of any vintage, the uplift suction should zero out the
dead load.
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