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Re: Ron Gallagher's Comments in SEAOC Plan Review

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The statement "Diaphragm, wood not acceptable as rigid diaphragm" is from the 
index of UBC which refers to the sections you mention. This is not a general 
assessment of wood diaphragm. The only item within the body of those section 
that deals with this issue is the paragraph next to the last: "In masonry or 
concrete buildings, lumber, wood structural panel and particleboard diaphragm 
shall not be considered as transmitting lateral forces by rotation." The 
intent is to prevent some unscrupulous engineer from using wood diaphragm in 
rotation to resist lateral loads from heavy walls. This is not a general 
statement about wood diaphragms being flexible.