Re: RE: ASCE 7-05 Cantilevered Columns‏

FWIW, I agree with Joe's interpretation.  You're taking a hit because you are relying on a "fixed" column base to transfer lateral load to the foundation elements.  R=2 = ultra conservative guess at the design lateral load.

2008/2/25 <Jnapd@aol.com>:

In a message dated 2/25/2008 12:54:15 PM Pacific Standard Time, lrhauer@hotmail.com writes:

Bill,
 
Good point, but still not sure what would be used- An R of "3" for "distributed mass cantilevered structures", or an R of "2" for "invreted pendulum" structures. Averaging these out comes up with an R of "2.5", which, again, seems reasonable to me, (back to an R of "2.2" for the '97 UBC/'01 CBC).
 
Larry Hauer S.E.

Larry

 

I read this as Inverted pendulum structure....all mass is at top of column

 

distributed mass cantilevered structures..... mass is distributed along the height of the column.

 

 

As I see it they have gone from 2.2 in 2001 CBC        to  2.0 in 2007 CBC  for all mass at top of column.

 

 

Joe Venuti
Johnson & Nielsen Associates
Palm Springs, CA

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