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RE: ASCE 7-02: Live Load on Canopy

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Refer to the definitions in the IBC to verify... a marquee cantilevers
into the right-of-way (supported by the building without additional
columns).  A canopy is a rigid structure with a covering attached (I
think of a canvas covering), is supported by the building and a least
one other post.  An awning is like a canopy by cantilevers without any
additional posts.

I've had very few "entrance structures" that I've designed with 75 psf.
I can usually throw out the "marquee" definition, but canopy is a little
"iffy".  Only because of the definition of "covering"... I assume that
is a fabric-type covering.  Somebody else may interpret to be any
roofing material.  

 
BDH
 
-----Original Message-----
From: Polhemus, Bill [mailto:BPolhemus(--nospam--at)wje.com] 
Sent: Monday, March 06, 2006 12:11 PM
To: seaint(--nospam--at)seaint.org
Subject: ASCE 7-02: Live Load on Canopy

I'm checking a canopy design. Referring to Table 4-1, reference
"Marquees and canopies" (middle of Page 13) it reads "75 psf."

Could that be right? Does this have other limitations that may not be
apparent here? For instance, the canopy under consideration here is a
free-standing canopy that serves a shelter for people waiting to board a
bus. It is not supported on or against a building wall.

75 psf just sounds MUCH to me. It certainly has a great impact on the
column design!

Opinions fervently solicited.

William L. Polhemus, Jr. P.E.
Senior Associate
mailto:bpolhemus(--nospam--at)wje.com 
WJE
Wiss, Janney, Elstner Associates, Inc. 
Engineers I Architects I Material Scientists
10235 West Little York, Suite 245
Houston, Texas 77040
P: 832-467-2177 F: 832-467-2178
http://www <blocked::http://www/> .wje.com 

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