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RE: ASCE 7-05 Cantilevered Columns

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They have the exceptions for steel cantilevered columns detailed with moment
frame requirements. I think most gas station canopies are designed as
cantilever columns.  The ones I've seen don't have moment frames both ways
anyway.  

-----Original Message-----
From: Larry Hauer [mailto:lrhauer(--nospam--at)hotmail.com] 
Sent: Wednesday, February 13, 2008 1:23 PM
To: seaint(--nospam--at)seaint.org
Subject: RE: ASCE 7-05 Cantilevered Columns

Tom and Scott,
 
I see that on page 122 of ASCE, Section "G" - BUT the "NP" designation for
Seismic Design Catagories D and E leads me to believe you can no longer use
this sytem no matter what the "R" coefficient you use is- i.e. they are not
permitted, period!
 
Thanks in Advance,
 
Larry Hauer S.E.




________________________________

	To: seaint(--nospam--at)seaint.org
	Subject: Re: ASCE 7-05 Cantilevered Columns
	From: Tom.Hunt(--nospam--at)fluor.com
	Date: Wed, 13 Feb 2008 13:44:05 -0800
	
	
	Larry, 
	
	Cantilever column systems are covered in ASCE 7-05 Table 12.2-1 under
item G (the second to last item on page 122). 
	
	Thomas Hunt, S.E. 
	Fluor 
	
	
	
	
	Larry Hauer <lrhauer(--nospam--at)hotmail.com>
02/13/2008 01:34 PM 
Please respond to seaint 	
To
"seaint(--nospam--at)seaint.org" <seaint(--nospam--at)seaint.org> cc Subject ASCE 7-05 Cantilevered
Columns 
	

		




	I'm trying to determine if structral systems that use to be
acceptable under the '97 UBC are even allowed under the '07 CBC/ASCE. Per
table 12.2-1 of the ASCE 7-05, section G, it appears that for Seismic Design
Catagories D and E, (most of Southern California), the following structural
systems are no longer permitted as lateral load carrying sytems:
	
	A wide flange cantilvered column system out of a concrete grade beam
at grade, (i.e. front of garage, etc.).
	
	A pile foundation system supporting light wood framing above, (i.e.
two story residence), unless it is a "Special reinforced concrete moment
frame"- i.e. cantilevered concrete piles no longer allowed.
	
	Am I missing something here, or do these systems go the way of the
buggy whips.
	
	Larry Hauer S.E.
	
	
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