I have been involved in the design of many custom homes, with different
firms in the past and on my own.
In every instance we have designed the walls in two parts: roof level shear
and overturning resolved from roof to second floor, and combined roof and
second story shear and overturning resolved from second floor to foundation.
Any net uplift from the upper level is additive to the lower level, and
implicitly any dead load utilized to resist overturning at the upper level
cannot be reused to resist overturning at the lower level.
There are many ways of performing the analysis, but in all cases static
principles must be upheld.
Fortunately, no-one I have worked with has taken the attitude that it is
"just a house" and somehow the laws of physics apply differently.
San Diego, CA
----- Original Message -----
From: Steve Hiner <shiner(--nospam--at)folsom.ca.us>
To: SEAINT (E-mail) <seaint(--nospam--at)seaint.org>
Sent: Thursday, January 20, 2000 10:30 AM
Subject: Hold downs of stacked wood shear walls