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RE: Open building with pitched roof

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From the factors that are given, I guess one could guess that, but the table for those values is given in figure 6-18D two pages following.



Joseph R. Grill, P.E. (Structural)

Shephard - Wesnitzer, Inc.

Civil Engineering and Surveying

P.O. Box 3924

Sedona, AZ  86340

PHONE (928) 282-1061

FAX (928) 282-2058



-----Original Message-----
From: Roger Davis [mailto:sds_rdavis(--nospam--at)]
Sent: Tuesday, June 20, 2006 2:38 PM
To: seaint(--nospam--at)
Subject: Re: Open building with pitched roof


Isn't that just Case A = wind perpendicular to ridge and Case B = wind parallel to ridge?


Roger C. Davis


SDS Architects, Inc.

Joe Grill <jgrill(--nospam--at)> wrote:

A couple of weeks ago, I ask a question regarding wind loads on an open structure with a pitched roof.  In my case it is a small bus stop canopy.  Since then I have purchased and received the new ASCE 7-0-5  with a section, 6.5.13 which deals with this subject.  By the way thanks to all of you that answered my last post on this subject and who provided me with temporary faxes from this section.

The project has resurfaced for me to finish and I have a simple, maybe dumb question.


Anyway, section contains an equation using a value of Cn and refers to sections 6-18A through 6-18D.  Table 6-18B is the table in question for my little project.


Now for the dumb question.  I have searched and can not find a definition for “Load Case” which gives two options “A” or “B” to find the values for Cnw or Cnl.  Can someone explain or send me somewhere in the text for the definition.  Maybe I’m reading over the definition somewhere.





Joseph R. Grill, P.E. (Structural)

Shephard - Wesnitzer, Inc.

Civil Engineering and Surveying





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