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Re: Question for wood panel at SEAOC Convention

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Dear Shafat,

Following are two questions for this morning's
wood panel at the
SEAOC Convention.  Please present them on my
behalf if there is
sufficient time.


Mark Swingle, SE    Oakland, CA


Consider the following proposed change to the 1997

Add a new 4th paragraph to Section 1630.6
"Horizontal Distribution 
of Shear" as follows:

"Buildings whose primary lateral-force-resisting
system consists 
of wood structural panel diaphragms and shear
walls may have the 
prescribed story shears distributed to the shear
walls based upon
tributary mass principles.  In addition,
redundancy, story drift,
and horizontal torsion need not be considered."

Question 1:  Would you be in favor of such a
change, if there were
a mechanism for its adoption?

Question 2:  If your answer is "no" to question 1,
can you imagine
a building which would pose a life-safety threat
to its occupants
(when designed according to the above code
change), due to 
redistribution of forces by the diaphragm?  Please
describe in 
sufficient detail to support your answer.