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@seaint.org
Subject: Re: ASCE 7-05 Cantilevered Columns
From: Tom.Hunt@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@hotmail.com>
02/13/2008 01:34 PM
Please respond to seaint
"seaint@seaint.org" <seaint@seaint.org> 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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