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Re: canopy footing
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 Subject: Re: canopy footing
 From: Daryl Richardson <h.d.richardson(nospamat)shaw.ca>
 Date: Mon, 13 Feb 2006 16:19:26 0700
Steve,
This seems scary to
you?
As I understood the
question it was related to the geometry of the concrete cube only so I made no
comment on any other part.
As I read the
description he had a T shaped structure 16' by 24'. That's two columns
(each with its own cube foundation) in a row 16' apart with a 12'
cantilever on each side of the T. Considering live load on one side only
with wind (say 30 plf, just to pick a number) and taking moments about the base
of the cube we have
Live load = 12*8*20psf = 1920# (one side only)
Dead load = 12*8*10psf = 960#
Wind = 30*8 = 240#
Moment = 1920#*6' + 240#*(14'+5') = 16,080 ft.lb. per cube
foundation.
Total weight of foundation = 5^3*150 = 18,750#
Total weight at base of foundation (for overturning case
only)
Wt = 18,750 + 1920 + 2*960 = 22,590 #
Eccentricity, e, = M/W = 16,080/22590 = 0.712
Factor of safety against overturning = footing
width/(2*e)
F.S. = 5/2/0.712 = 3.5 <
This analysis is a bit
simple, perhaps excessively so; but the basic design looks O.K. to
me. Did I miss something?
Regards,
H. Daryl Richardson

 References:
 RE: canopy footing
 From: Haan, Scott M POA
 Re: canopy footing
 From: S. Gordin
 RE: canopy footing
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