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RE: Light Gauge Steel - Full-Compliance Design

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-----Original Message-----
From: Sid Danandeh 
Sent: Thursday, October 05, 2000 1:11 PM
To: 'seaint(--nospam--at)'
Subject: RE: Light Gauge Steel - Full-Compliance Design


City of LA has a good reference advisory on residential steel construction
including energy design requirements , structural detailing etc.

Also Nabi Youssef's office is involved in designing a 5 story dormitory in
San Diego using light gauge steel. When I called them they were very helpful
. You may want to call them , they have tested several shear walls etc. just
for this purpose. 

As you know the 1997 UBC's plywood shear wall values for light gauge have
limits i.e.  the steel to be gauge 20  and Nabie's office did tests to
overcome those limits. 

Also most cities now accept the ST12. ST12 is the  structural advisory
bulletin  by the LA city and also adopted by the LA regional code committee
consisting of more then 50 cities in the LA region. That indicates that you
may assume flexible diaphragm distribution if you add 20 % to shear wall
values etc. 

You can down load that from the LA regional code committee sites.

Also you can contact Nick Deliqudri SE. He is the head of research at the LA
city. I am sure he will give you copies of these documents. If it helps tell
him Sid from Palmdale referred you to him. His number is 1 818 756 7659.

good luck

-----Original Message-----
From: Dennis S. Wish [mailto:dennis.wish(--nospam--at)]
Sent: Monday, October 02, 2000 10:41 AM
To: Lynn Howard
Cc: SEAINT Listservice
Subject: Re: Light Gauge Steel - Full-Compliance Design

I'm in digest mode which makes quick responses difficult. I wanted to thank
you for the advice. I guess what I wanted to know was how to address the
issues of diaphragm deflection which are calculated for blocked wood
diaphragms. How do we treat a light-gauge steel diaphragm with plywood when
concrete is not being used. In my case, the Architect is trying to make a
statement by designing a conventional home using only cold-form steel (which
is not exposed). The energy restrictions just barely bring this up to
minimum compliance which should - in my opinion, defeats the advantages of
steel compared to wood in a desert climate.
The Architect also argues that wood warps, twists and in nominal sizes is
not desirable to him. His bias comes from more than 30 years designing steel
(light-gauge) industrial and commercial structures.

I don't see the advantage when material and labor cost is higher (the
builder who will do this project has little experience in light-gauge

Mike Krakower called me in the middle of writing you, to offer me his
opinions. As you indicated, Mike feels it is "doable" with a pan deck and
lightweight concrete and rigid braced frames (verses vertical plywood
shear), but when trying to design it to full compliance, there is not much
known about the performance of the horizontal diaphragms with plywood
sheathing to apply to the rigid analysis. Mike indicated some work coming
out of testing at Irvine that may provide additional information (to be
released as a COLA report). I'll check into this further.

Thanks again for taking the time to respond - I do appreciate it.

Dennis S. Wish, PE
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