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RE: Open building with pitched roof

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Joe, I was glad to see your messages [including the lighthearted follow-up on active pressure coefficient].  I was hoping that the fire in Oak Creek Canyon wouldn’t trouble you – how are things with you & yours?.  I’ve had fond memories of that area since my bride and I spent our honeymoon there about 45 years ago.


Nels Roselund, SE

South San Gabriel, CA


From: Joe Grill [mailto:jgrill(--nospam--at)]
Sent: Tuesday, June 20, 2006 11:37 AM
To: seaint(--nospam--at)
Subject: Open building with pitched roof


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