Wednesday, February 13, 2008

RE: ASCE 7-05 Cantilevered Columns

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

-----Original Message-----
From: Larry Hauer []
Sent: Wednesday, February 13, 2008 1:23 PM
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.


Subject: Re: ASCE 7-05 Cantilevered Columns
Date: Wed, 13 Feb 2008 13:44:05 -0800


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.

Larry Hauer <>
02/13/2008 01:34 PM
Please respond to seaint
"" <> cc Subject ASCE 7-05 Cantilevered

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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