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Compactness of Round HSS In Compression:
 
Calculation:
Designer/Checker:
   
Input:  
   
 
(Note: All input Metric units are converted to English units for the equations below and then the output English units are converted back to Metric)
 
AISC Table B4.1a, Case 9:
This calculation applies to round HSS.
     
Outside diameter (D - in or mm)
Steel yield strength (fy - ksi or MPa)
Thickness of the steel (t - in or mm)
   

     
   
   
Output:
 
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Width thickness ratio, WT =
   
Limiting slenderness for noncompact shape, WTr =
Web compact, noncompact or slender?
 
 
 



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