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Compactness of a Rolled I-Shape Or Channel 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 1 and Case 5:
This calculation applies to rolled doubly symmetric I shaped sections and channels in compression.
 
Width of the flange (bf - in or mm)
Height of web (h - in or mm)
*Height of compression portion of web (hc - in or mm)
Steel yield strength (fy - ksi or MPa)
Thickness of the flange (tf - in or mm)
Thickness of the web (tw - in or mm)
*hc is the distance from section centroid to the compression flange.  In doubly symmetric I - shapes and channels hc = h/2.
     
   
   
Output:
 
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Width thickness ratio flange, WTF =
Limiting slenderness for noncompact flange, WTFr =
Flange compact, noncompact or slender?
Width thickness ratio web, WTW =
Limiting slenderness for noncompact web, WTWr =
Web compact, noncompact or slender?
 
 
 



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