According to the performance-based design method [7], the
RBS frames should provide a plastic rotation of 0.03 rad for Life
Safety (LS) level. While, as shown in the next section, the
minimum plastic rotation needed for Collapse Prevention (CP)
level is 0.045 rad, approximately. Satisfying this provision is of
more importance in the Maximum Probable Earthquake (MPE)
level [7]. However, the plastic rotation of 0.045 rad has rarely
been reported for RBS connections.