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Re: Seismic requirements for cladding

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Good question.

Generally (up until the drift increases of the 1997 UBC) the drift was 
accomodated by the space between the aluminum frame and the glass.  This 
allowed the frame to rack and become a parallelagram while the light of glass 
remained a rectangle.  It is going to be interesting when the .025h reaches 
the architects and owners and they are informed that the size of the lights 
of glass that they can use will be limited.

I would enjoy any other thoughts

Jim Sadler
Structural Engineer
Cladding Design