ABSTRACT
During the experimental tests on the profiles framed in Classes 1 or 2 (elastic buckling being avoided) one can observe that the plastic deformations are produced only in a limited zone, the rest part of the member remaining in elastic field. In this plastic zone large rotations are concentrated, working as plastic hinges. The plastic rotations are amplified if in these zones a buckling of flanges occurs. Examining the experimental and numerical simulation presented in literature, some very important conclusions results.
