Subject: RE: Existing shearwall with new penetrations
From: "Joseph M. Otto, P.E." <jmo_engineering(--nospam--at)email.msn.com>
Date: Fri, 9 Jun 2000 09:48:56 -0700
It was my understanding that when you check an existing shear wall to see if
you can put penetrations into it, you have to use current UBC design loads
and make sure it can withstand these loads per the current UBC requirements.
Isn't this correct?
From: Jeff Coronado [mailto:"jcse(--nospam--at)flash.net"@flash.net]
Sent: Friday, June 09, 2000 7:34 AM
Joseph, you are not designing a new wall. What is the capacity of the
wall according to the code that was current at the time the wall was
designed? Then it seems to me that that is the capacity of the wall you
have to begin with.
Jeff Coronado, S.E.
West Covina, CA
Joseph M. Otto, P.E. wrote:
> IRELAND ENGINEERING
> January 7, 2000
> I have been requested to place new penetrations into an existing
> plywood shearwall which is sheathed with 1/2" ply. both sides nailed
> with 10d nails at 4" on center at plywood panel edges and 12" o.c. on
> the field. The edges of the panels are nailed to the same 2X studs on
> each side of the wall.
> Table 23-II-J-1 footnote 2 (page 2-288) of the 1997 UBC indicates that
> these studs need to be 3X.
> Does this mean that I can't use these walls to take shear?
> Joseph M. Otto, PE
> Civil Engineer, Project Manager
> Ireland Engineering, Inc.
> 46750 Fremont Blvd., Suite #204
> Fremont, CA 94538
> (510) 438-9632 x11 FAX (510) 438-0689