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IBC 2012 Wind Loads

IBC 2012 Wind Loads

IBC 2012 Wind Loads

(OP)
In the new IBC, base wind loads are given on several maps all with the basic criteria of Exposure C. Does anyone have a reference as to converting those values to Exposure D?

RE: IBC 2012 Wind Loads

I always use ASCE 7 for wind loads (since it's referenced by IBC). The new version (ASCE 7-10) has the following formula for velocity pressure:

qz = 0.00256*Kz*Kzt*Kd*V^2*I

Your Kz factor comes from a table that has different values for each exposure category.

RE: IBC 2012 Wind Loads

The Kz value in equation 16-35 modifies the velocity pressure based on height and exposure.

RE: IBC 2012 Wind Loads

(OP)
Thanks Gentlemen.....I got it.

RE: IBC 2012 Wind Loads

My understanding of the 2012 IBC, which references ASCE 7-10, is that I has been removed. In it's place, there are site specific wind maps, similar to what they have in seismic. There's a link on the internet that gives you wind speeds for zip codes or longitude and latitude. Unfortunately, I don't have that link with me, but it's great. There are different maps for Category I, II and III/IV structures with the wind speeds for III/IV being more than I or II (duh). The other factors (Kz, Kd, etc.) are pretty much the same.
As DCBII and wannabe said, the tables give the factors for different exposures and heights.

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