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RE: Wood interior wall studs

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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?


David A. Topete, SE


From: Andy Heigley [mailto:aheigley(--nospam--at)]
Sent: Friday, July 13, 2007 10:32 AM
To: Seaint
Subject: Wood interior wall studs


Hello all:


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