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RE: Light Gauge Steel - Full-Compliance Design

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Sid,
Do you have the web address of LA regional code
committee site?
Thanks,
Frank


--- Sid Danandeh <sdanandeh(--nospam--at)cityofpalmdale.org> wrote:
> 
> 
> -----Original Message-----
> From: Sid Danandeh 
> Sent: Thursday, October 05, 2000 1:11 PM
> To: 'seaint(--nospam--at)seaint.org'
> Subject: RE: Light Gauge Steel - Full-Compliance
> Design
> 
> 
> Dennis
> 
> 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)gte.net]
> Sent: Monday, October 02, 2000 10:41 AM
> To: Lynn Howard
> Cc: SEAINT Listservice
> Subject: Re: Light Gauge Steel - Full-Compliance
> Design
> 
> 
> Lynn
> 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
> steel).
> 
> 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.
> 
> Regards,
> Dennis S. Wish, PE
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=== message truncated ===


=====
Fariborz Tehrani,                      Phone: (310)509-8826
Civil Engineer                           Fax: (530)481-9532
BSCE, MSCE, PE                    Voice Mail: (877)743-6206
email: fmtehrani(--nospam--at)msn.com
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