A building is considered open if each wall is at least 80 percent open (ASCE 7-10, Section 26.2, “BUILDING, OPEN”). This condition is expressed for each wall by the equation Ao ≥ 0.8 Ag where

Ao = total area of openings in a wall that receives positive external pressure, in ft2 (m2)

Ag = the gross area of that wall in which Ao is identified, in ft2 (m2)
 

EXAMPLE:

Open Building
 
However, a building that meets both the “open” and “partially enclosed” definitions should be considered “open” (ASCE 7-10, Section C26.2, “BUILDING, ENCLOSED; BUILDING OPEN; BUILDING PARTIALLY ENCLOSED”).
 
See also “Enclosed Building”  and “Partially Enclosed Building

 

Mar 26, 2016   1407    Codes & Standards    
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