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RE: ASCE 7-05 Cantilevered Columns

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There are cantilevered columns / inverted pendulums in ASCE 7-05 at the back
of the table but with the response modification factors in the code they have
you are practically designing with a base shear equal to the building weight.


-----Original Message-----
From: Larry Hauer [mailto:lrhauer(--nospam--at)hotmail.com] 
Sent: Wednesday, February 13, 2008 12:35 PM
To: seaint(--nospam--at)seaint.org
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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