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Addendum RE: Diaphragm circa 1971

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In putting the Gold Bond brochure back in the file, I spied a paragraph 
headed, "seismic data."  It states, "... horizontal diaphragm shear values in 
excess of 1100 pounds per lineal foot are allowed by each of the following 
regulatory jurisdictions:

      [ICBO] Research Recommendations 1269 and 1312

      City of Los Angeles - General Approvals 22107 and 23267

      ... (Tri-Services Manual) Seismic Design for Buildings

Each approval gives criteria for computing allowable shear and includes a 
table listing allowable values for several conventional gypsum deck 
assemblies. ..."


A. Roger Turk, P.E.(Structural)
Tucson, Arizona

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