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Re: Seismic Upgrade.... Blue Book Commentary on wood diaphragm

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In a message dated 5/23/99 3:30:38 PM Pacific Daylight Time, Byainc(--nospam--at) 

<< 1-	Your statement that the use of rotation was disallowed by the code 
 for multistory buildings may be more of a wishful thinking. The language in 
 the code for allowing rotation unfortunately has not changed for some time. 
 If you refer to the 7th paragraph of section 2315.1 in the 97 UBC the 
 is still allowed if you meet some dimensional and aspect ratio requirements. 
 The only reason you don't see more of these building being built, is that 
 most designers have the common sense of not opting for a scheme that has 
 proven to be problematic.  Maybe this should be the focus of a future change 
 in the IBC which continues to allow this practice. >>

Thanks for the corrections, Ben.  I don't remember the particulars but it 
might have been a change in the Los Angeles City Code that outlawed open 
front designs when a living unit existed above as a result of Northridge. It 
might have occured earlier (Whittier Narrows or Loma Prieta) but I remember 
the discussions that arose due to the change. 
Possibly someone else can come up with the facts to support my memory. This 
may have been restricted to the Los Angeles city and county.