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[SEAOC] RE: TILT-UP BUILDING WITH GYPSUM ROOF DIAPHRAGM

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Fellow Engineers;

A friend of mine (who is not on the net) was asked to inspect a tilt-up
building.
To his surprise (and mine) he found the roof diaphragm to be composed of 12"
to 14" of GYPSUM looking material. The roof framing members are steel beams
at 8' o/c.
This gypusm looking products are in 8' panels and are resting or dropped
between these beams. The walls are concrete. Now the big question is how does
this work as a horizontal diaphragm? There is no wood or steel in the panels.

If any of you have encountered a situation like this, it would be appreciated
to hear your comments. 

How does one seismicley retrofit a building with these characteristics?
How does one anchor the walls and how does the shear at the boundaries (if
any) transfer to the shear resisting elements?

I was thinking of suggesting a horizontal rod bracing system to substitute
for the 
lack of a good horizontal diaphragm. Any comments?

Ara Maloyan P.E.
Amaloyan(--nospam--at)aol.com

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