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RE: Plywood & Mtl. Studs

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One more point: you do not need to reduce the Plywood-on-Steel values as you
do the Plywood-on-Wood values in LA since these the results are from cyclic


-----Original Message-----
From: Structuralist [mailto:dennis.wish(--nospam--at)]
Sent: Monday, January 29, 2001 2:19 PM
To: seaint(--nospam--at)
Subject: RE: Plywood & Mtl. Studs

George is correct - the 1997 UBC values represent changes to the previous
prescriptive methods based on the values of APA's work. The testing and work
done by Professor Reynaud Serrette identified differences in performance of
sheathed walls. They identified a potential failure of the wall in shearing
of the screws caused by the stiffness of the studs. To provide better
performance, Professor Serrette reduced the stiffness of the studs - from 16
or 18-gauge to 20-gauge and tested the walls to reach their realistic
failure due to stud buckling.

To the best of my knowledge, APA does not agree with the reduction in values
that was adopted and published in the 97 UBC. I do not know what further
testing has been done by APA that may increase the values in future code
cycles and possibly John Rose may enlighten us.

Serrette has also perform cyclic testing of metal stud walls using the test
provisions established by SEAOSC and, I believe, these are represented in
the 97 UBC.

There is also an example of a multi-story residential design in the ICBO
Seismic Design Manual Volume II that you may reference.

The evolution of the work done by Professor Serrette is available in the
LGSEA newsletters which are available to the professional community for free
download. You may review the newsletters in PDF format at

You can also find more links to Cold-Form Steel on the Reference pages of
the Structuralist.Net Professional page - which includes available reference
documents from National Steel Alliance, HUD, AISI and other sources. This is
accessed at

Dennis S. Wish, PE
The Structuralist Administrator for: <>
AEC-Residential Listservice
(208) 361-5447 E-Fax
ICQ # 95561393

-----Original Message-----
From: George Richards, P.E. [mailto:george(--nospam--at)]
Sent: Monday, January 29, 2001 9:36 AM
To: 'seaint(--nospam--at)'
Subject: RE: Plywood & Mtl. Studs

Check out the 1997 UBC.  The values are now in the code.

George Richards, P.E.

-----Original Message-----
From: ASLCSE(--nospam--at) [mailto:ASLCSE(--nospam--at)]
Sent: Monday, January 29, 2001 8:51 AM
To: seaint(--nospam--at)
Subject: Plywood & Mtl. Studs

I am sure there are "approved" values for plywood shear panels screwed onto
metal studs.  Can anyone refer me to those values (incl. L.A. City).
Thank you
Anotnio S. "Tony" Luisoni
Consulting SE
phone/fax (818) 363-6531