Is UNB / UNT required for columns ?
When columns subjected to gravity loads in a portal frame, we can define compression flange and tension flange.
The same column if subjects to reversal forces in wind load case how to define UNB /UNT. Flexural bending in a column switches between compression and tension in
opposite wind load cases.
In that situation how to decide the compression and tension flange and give UNB /UNT?.
Please clarify?
Manimala