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RE: Overturning Load Combination?

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1997 UBC 1629.1 "Allowable stres Design may used to evaluate sliding or overturning at the soil-structure interface regardless of the design approach...". 
 
You can use .9D+-E/1.4 to determine required footing mass even if you design the footings and anchor bolts with strength / LRFD design.
 
The IBC does not allow you to ignore + - Ev for allowable stress design like 1997 UBC 1630.1.1 does.
 

Scott M Haan P.E.
Plan Review Engineer
Building Safety Division
Development Services Department
Municipality of Anchorage
http://www.muni.org/building
phone:907-343-8183 
fax:907-249-7399
mailto:haansm(--nospam--at)ci.anchorage.ak.us

-----Original Message-----
From: David Taubman [mailto:david(--nospam--at)dtaubman.com]
Sent: Friday, October 26, 2001 4:08 PM
To: seaint(--nospam--at)seaint.org
Subject: Overturning Load Combination?

 
To size the pads for resisting uplift caused by earthquake overturning
(for a tilt-up shearwall), which load combination should I use for the UBC97?:
 
0.9D +/- E/1.4  or
0.9D +/- E   ?
 
Thanks in advance.
Luca Musacchio P.E.