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RE: 2006 IBC Wind Load question[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: <seaint(--nospam--at)seaint.org>
- Subject: RE: 2006 IBC Wind Load question
- From: <William.Sherman(--nospam--at)CH2M.com>
- Date: Mon, 27 Aug 2007 08:40:45 -0600
Dennis, I'm not sure where you heard that "design wind loads can be designed more like the 97 UBC if the design values are supplied by the building official". I agree with Scott that the method used for design is independent of whether the wind speed came from the maps or the building official when using IBC/ ASCE 7. The "Simplified Method" can be used with either source for wind speeds as long as you meet the limitations of the method.
I tend to use the Analytical Procedure in ASCE 7, simply because I've had enough structures that do not meet the limitations of the Simplified Method such that I prefer to stick to one method for all of my designs.
CH2M HILL / DEN
From: Scott Maxwell [mailto:smaxwell(--nospam--at)umich.edu]
Sent: Saturday, August 25, 2007 9:21 PM
Subject: RE: 2006 IBC Wind Load question
In my experience, unless the local jurisdiction completely modified the wind provisions for use in their local building code, the only item that you might get from the local code official is the wind speed. But, that would only really likely happen in areas along the East and South Coasts (i.e. hurricane zones where the wind speed maps get a little tough to read...it is good to check with the local official as to what wind speed to use...OR in special wind regions typically in mountous regions). The vast majority of the US is 90 mph (with the exception of the three West Coast states that magically have 85 mph winds when you cross the border into those states).
The only other thing that the code official MIGHT dictate is the Exposure Category, but that has been EXTREMELY rare in my experience.
Beyond that, there should be no difference between getting values off the map or getting them from the code official. The process is still the same...unless they have replaced the typical IBC/ASCE 7 wind provisions with something else or modified those provisions extensively.
Point is that I don't see a difference between getting wind parameters from a code official vs. a map in terms of the process for determining the wind loads. It is the same process...it is just that first little piece of data used to input into the process might differ.
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