After running the design in RF-STEEL AISC, I receive error message 1002 - Invalid cross-section of type "Channel" according to F2. What does this error mean?


Section F2 out of the AISC 360-16 [1] states that doubly symmetric I-Shapes and Channels that are bent about their major axis must be compact sections in order to be designed. An example of this can be seen below.

Non-compact sections cannot be designed according to F2. Figure 2 shows a non-designable section.


Compact Non-compact Designable


[1]   ANSI/AISC 360-16, Specification for Structural Steel Buildings

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