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Steel Manual: kdes vs kdet 1

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vmirat80

Structural
Nov 9, 2020
7
Looking at a W10x30 in the steel manual. It has k for design at 0.810 inches. The k for detailing is 1-1/8 inches. That's nearly a 3/16 inch difference. I can understand design and detailing being different, but not that much. Why such a large difference?
 
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DrZoidberWoop nailed it. Just to make it easier, here is what the link says:

Per Section 12.3.1 of ASTM A6, fillet radii are an unspecified dimension. As such, they are manufacturer-specific. Contact an individual manufacturer directly for additional information. AISC performs a periodic survey of producers’ practices to determine the minimum and maximum fillets used in shape production. The results of that survey are used to establish values in the AISC Manual, such as T, kdes, kdet and k1, which are detailing values. T, kdet and k1 are based upon the largest reported fillet radius, which ensures that potentially large fillet radii will not lead to fit-up problems. kdes is a design value based upon the smallest reported fillet, which ensures that the strength will not be overestimated in a design calculation no matter what the fillet size.
 
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