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Compactness of a Rolled I-Shape Or Channel in
Flexure,
Radius of Gyration of Compression Area: |
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Calculation: |
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Designer/Checker: |
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Input: |
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(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) |
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AISC Table B4.1.b, Case 10 and Case 15. |
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This calculation applies to rolled doubly symmetric I shaped sections and
channels bent about their major axis in flexure. |
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Width of the flange (bf - in or mm) |
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Height of web (h - in or mm) |
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*Height of compression portion of web (hc - in or mm) |
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Steel yield strength (fy - ksi or MPa) |
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Thickness of the flange (tf - in
or mm) |
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Thickness of the web (tw - in or mm) |
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*hc is the distance from section centroid to the
compression flange. In doubly symmetric I - shapes and channels hc = h/2.
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Output: |
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Width thickness ratio flange, WTF = |
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Limiting slenderness for compact flange, WTFp = |
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Limiting slenderness for noncompact flange, WTFr = |
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Flange compact, noncompact or slender? |
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Width thickness ratio web, WTW =
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Limiting slenderness for compact web, WTWp =
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Limiting slenderness for noncompact web, WTWr = |
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Web compact, noncompact or slender? |
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Compact web - radius of gyration compression flange plus 1/6 of the web,
rts = |
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Noncompact or slender web - radius of gyration compression
flange plus 1/3 of the compression area of web, rt = |
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