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Re: Cantilever System (Help!)

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Have you considered differential movement of the lower roofs?  It seems to
me that the upper roof would have to slide at one side to avoid possible
very high lateral shear in the columns.

Jay Bryan
> I have 2- one story wood buildings to be used as senior citizen
> center. One is 80ft x 100 ft and the other is 90 ft x 90 ft
> approximately.  Their roof are almost at the same level (17.5 ft.).
> In between these two buildings (30 ft apart) are lounge, lobby, and
> reception area  and it was covered by a higher roof (at elevation 27
> ft.).  There is no shear resistance from the lower diaphragm to the
> higher diaphragm because it is almost all windows. We decided to use
> steel columns to cantilever out above the lower diaphragm to resist
> seismic force. The columns are supported at the lower roof level and
> at the foundation.  I used R=2.2 to get the seismic load at the higher
> roof.