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[SEAOC] Gypsum Roof

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Gypsum roof diaphragms as seismic resisting elements were originally tested 
by Clarkson Pinkham of S.B. Barnes & Associates some 30 years ago.  These 
tests resulted in code values for strength an stiffness.

We performed several cyclic tests on 6' square specimens followed by detailed
non-linear stiffness degrading dynamic analysis to provide seismic upgrade
design criteria for gypsum roofs.

The test results are reported in his paper published in the Proceedings of 
the Tenth World Conference in Earthquake Engineering, 1992.  I think this 
paper will be of help to you.

Mike Mehrain 
Dames & Moore
213-683-1560 x 504