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RE: Another ASCE 7-05 Wind Load Question

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In terms of intent (i.e. suburban/urban), yes, they are the same.  Since they are worded differently, however, you might have some code official (or engineer) interpret them differently.  I can see some "issues" with the way the UBC describes it (not that ASCE 7 is perfect).  I use the general intent...B is suburban/urban and rural in a forest (i.e. lots of trees), C is rural with fields (i.e. not rural in forests) and hurricane coasts, and D is non-hurricane coasts (i.e. West Coast and Great Lakes).
Adrian, MI
-----Original Message-----
From: Bill Allen [mailto:T.W.Allen(--nospam--at)]
Sent: Wednesday, February 20, 2008 11:52 AM
To: Seaint
Subject: Another ASCE 7-05 Wind Load Question

Is Exposure B the same as Exposure B in the 1997 UBC? It sounds like Exposure B in ASCE 7 is applicable in typical suburban/urban areas. OTOH, I’ve never been able to get UBC Exposure B to fly here without rigorous hoop jumping.




T. William (Bill) Allen, S.E.


Consulting Structural Engineers
V (949) 248-8588 F(949) 209-2509