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Re: Report on Wood Diaphragm Issues

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Tim McCormick the Building Official at the City of Santa Monica wants a
Rigidity Analysis (1630.6) and a Story Drift Analysis (1630.10) for a one
story residence no matter what Seaoc or LA City says.  I used the Simplified
Design Base Shear Method. A lot of Mr. McCormick's  information comes from a
SEAOC Seminar, Wood Diaphragms and Shear Wall Defections,.authored by
Douglas Thompson S.E. in which is stated "Past earthquakes have shown that
lateral forces are distributed by relative rigidities."

I would appreciate any help and how to handle this situation?

Ken Wilkinson S.E.

----- Original Message -----
From: <RShreenan(--nospam--at)>
To: <seaint(--nospam--at)>
Sent: Saturday, December 11, 1999 1:05 PM
Subject: Report on Wood Diaphragm Issues

> I just received this e-mail.  It looks like Dennis's long, hard fought
> is producing some encouraging results.  My hat is off to Dennis and others
> who have pursued this issue and my thanks to Ron Hamburger and others on
> Seismology Committee that responded.
> In this business it is hard to find time to get involved in complex issues
> when one doesen't fully understand them.  I find it necessary to attend
> seminars each year just to keep up with new  code changes materials and
> methodology.  When business is good you have to make hay while the sun is
> shining.------My excuses.
> I hope that this latest report on diaphragms will be accepted by plan
> agencies
> on the intermin until the prescribed code changes are made official.
> From one of the many silent observers,
> Ray Shreenan