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RE: Discontinuous Shear walls

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Andy, I believe that Doug's reply answers your original question. 
Regardless of which force governs design, be it seismic or wind forces, 
detailing requirements are based on seismic.  Maybe you can clarify your 

David A. Topete, S.E.

Wildman & Morris
120 Howard Street, Suite 500
San Francisco, CA 94105
P:   (415) 8962644
F:   (415) 8962636

"Andy Heigley" <aheigley(--nospam--at)> 
10/06/2006 10:53 AM
Please respond to


RE: Discontinuous Shear walls

I know I always have to design for seismic but even with the overstrength 
factor applied to seismic forces, the wind forces still control.
Andrew Heigley, PE
Original Message
From: Doug Mayer [mailto:dougm(--nospam--at)]
Sent: Friday, October 06, 2006 12:46 PM
To: seaint(--nospam--at)
Subject: RE: Discontinuous Shear walls
Per the 2001 CBC section 1626.3:
Seismic and Wind Design.  When the codeprescribed wind design produces 
greater effects, the wind design shall govern, but detailing requirements 
and limitations prescribed in this section and referenced sections shall 
be followed.
I take this to mean that even if wind loads govern, you still have to 
design and detail based on seismic requirements.  I dont know if there is 
a comparable section in the IBC, but I would assume there is.  Hope that 
Doug Mayer, S.E.
Structural Engineer
teter a+e, LLP
Architects & Engineers
p: 559.437.0887
f:  559.438.7554
e: dougm(--nospam--at)

From: Andy Heigley [mailto:aheigley(--nospam--at)] 
Sent: Friday, October 06, 2006 5:50 AM
To: Seaint
Subject: Discontinuous Shear walls
Somewhat keeping on topic, I have a multistory apartment building, where 
Im losing a lot of shear walls at the 1st floor, but my wind design force 
is significantly more than seismic.  Are there any provisions for 
discontinuities in vertical resisting elements that are controlled by Wind 
forces?  I know that in the seismic chapter, theres the vertical 
structural irregularities table, to which gives you provisions for 
seismic, but obviously, losing the lower level of a 2 or 3 story shear 
wall has significant affects under either wind or seismic loadings.
Also some food for thought  do you guys feel that the building codes 
should possibly add section in the structural chapter for irregularities, 
and the provisions for both wind and seismic listed in a table.  I think 
that would be helpful. 
Andrew Heigley, PE
Dublin, OH