load duration factor.
Also when it is a rated wall the studs are supposed to use F'c*.78 and check
with a minimum Le/d of 33.
There are a lot of things a lot of people don't check. Don't let that deter
you from the moral high road.
-----Original Message-----
From: Andy Heigley [mailto:aheigley@jgaeng.com]
Sent: Friday, July 13, 2007 9:32 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.
Thanks,
Andrew Heigley, PE
******* ****** ******* ******** ******* ******* ******* ***
* Read list FAQ at: http://www.seaint.org/list_FAQ.asp
*
* This email was sent to you via Structural Engineers
* Association of Southern California (SEAOSC) server. To
* subscribe (no fee) or UnSubscribe, please go to:
*
*
http://www.seaint.org/sealist1.asp
*
* Questions to seaint-ad@seaint.org. Remember, any email you
* send to the list is public domain and may be re-posted
* without your permission. Make sure you visit our web
* site at: http://www.seaint.org
******* ****** ****** ****** ******* ****** ****** ********