There is an indication (shown in the members Unity Check) of if a member is exceeding the Euler Buckling parameters. This is explained in the output file as:
(2) IF THE AXIAL COMPRESSIVE LOAD ON A MEMBER EXCEEDS THE EULER BUCKLING LOAD, THEN THE AXIAL UNITY CHECK VALUE FOR THE MEMBER IS AUGMENTED BY 100 TO INDICATE THAT THE MEMBER HAS BUCKLED
Remember that this is an Elastic response, not plastic.