Specifies an American Institute of Steel Construction (AISC) shape name. For a user-defined shape, type USER. You must enter the AISC names exactly as shown in the AISC handbook with the exceptions:
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Enter fractions as decimals. For example, type LX6X3-1/2X1/2 as L6X3.5X0.5
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Omit all leading or trailing zeros.
You can select the section name from the window after clicking the Select Section ID button.