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Re: IBC Component and Cladding Wind Load

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Tim,

This is one of the confusing things about the ANSI/ASCE wind provisions 
dating back to (and possibly beyond) ANSI A58.1-1972.

Positive pressures act toward the surface under consideration.

Negative pressures act away from the surface under consideration.

For example, if you have a negative external pressure *and* a positive 
internal pressure, the values are additive.  However, if you have a negative 
external pressure *and* a negative internal pressure, the effective pressure 
is the difference in the two values.

HTH

A. Roger Turk, P.E.(Structural)
Tucson, Arizona

Timothy P. Spengler wrote:

. > The component and cladding wind load table of the 2000 IBC ( Table
. > 1609.6.2.1(2) ) list two numeric values in each cell.  Does anyone know 
. > what each value specifically represents?

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