If necessary you can change the section type of a member manually in Steel Designer. Note however, that if you do so, you will need to re-analyse the structure using the Analyse command from the Case menu.

To set the section type for a member or group of members

Ø  Select the required members in the Frame window

Ø  Choose Section Type… from the Frame menu

United States sections library shown

Ø  Choose the section from the list

Ø  Click OK