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Solve for Lp and Lr of a Noncompact Web I-shaped Steel Beam:
 
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)
 
From AISC F4 And F5:
This calculation applies to: (a) doubly symmetric I-shaped members bent about their major axis with noncompact webs; and (b) singly symmetric I-shaped members with webs attached to the mid-width of the flanges, bent about their major axis, with compact or noncompact webs; and (c) doubly symmetric and singly symmetric I-shaped members with slender webs attached to the mid-width of the flanges, bent about their major axis.
     
Effective radius of gyration, (rt - in or mm)*
Steel yield strength (fy - ksi or MPa)
*Effective radius of gyration, rts is approximately equal to the Radius of gyration compression flange plus 1/3 of the compression area of web for I shapes with a rectangular compression flange.  
   

     
   
   
Output:
 
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Lp =
Lr =
   
 
 
 
 



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