Mark E. Deardorff, SE
R & S Tavares Associates, Inc
9815 Carroll Canyon Road
San Diego, CA 92131
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David Topete [mailto:dtopete(--nospam--at)gfdseng.com]
Sent: Friday, July 13, 2007 10:40
Subject: RE: Wood interior wall
Are you being overly conservative by
designing for both floor live load and roof live load concurrent? Also,
silly question, but are you checking a load combo at strength level, and using
working stress design for the wood?
Sent: Friday, July 13, 2007 10:32
Subject: Wood interior wall studs
I just want to get some feedback from
other engineers about designing interior load-bearing wood wall studs.
When designing the walls, I normally check two load combinations:
1) DL + LL +LLr
2) DL +0.75LL + 0.75LLr + 0.75W
(with W = 5.0 psf interior horizontal partition load; I typically use a Cd=1.0
if I am just supporting floor live and dead load. And a Cd=1.15 when
carrying roof loads in addition to the floor live and dead loads. I think
the use of Cd=1.6 seems less conservative when you are dealing with large axial
loads, particularly in a multi-story buildng.)
A contractor is battling me over
some stud sizes b/c the stud height is about 10’-0” and for
2x4’s once you add the horizontal loading, in the second combination
above, it significantly reduces the axial capacity. His engineer doesn’t
check the second loading listed above.
I just want to get some other
people’s opinion on what they check in your own design.
Andrew Heigley, PE