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RE: Existing shearwall with new penetrations

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Footnote 3 says that if there is more than 350 plf in the wall, you need 3x
studs.  It says a 2" sill can be used for shears less that 600 plf.  But, I
think, the studs still need to be 3X ?  Sounds to me like this wall that
used to be good for 920 plf is worth 350 plf now.....?

Any comments?

Joe

-----Original Message-----
From: Todd Hill [mailto:thill(--nospam--at)tkarch.com]
Sent: Friday, June 09, 2000 11:17 AM
To: 'seaint(--nospam--at)seaint.org'
Subject: RE: Existing shearwall with new penetrations


This was my understanding also.
If a client is looking to change the load capacity of a floor on a 1950
building.
We don't use the 1950 code.
Since a change is being made the applicable code of date is the one to be
used.
I agree with Ben that one side is probably all you will be able to use.

-----Original Message-----
From: Joseph M. Otto, P.E. [mailto:jmo_engineering(--nospam--at)email.msn.com]
Sent: Friday, June 09, 2000 11:49 AM
To: seaint(--nospam--at)seaint.org
Subject: RE: Existing shearwall with new penetrations


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?

Joe

-----Original Message-----
From: Jeff Coronado [mailto:"jcse(--nospam--at)flash.net"@flash.net]
Sent: Friday, June 09, 2000 7:34 AM
To: seaint(--nospam--at)seaint.org
Subject: Re:


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:
>
>
>
>
> [Image]
>
> 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?
>
> :Respectfully,
>
> 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
> jmo_engineering(--nospam--at)email.msn.com
>
>
>  [Image]