FEMA 451B Notes Inelastic Behavior 6-1 Inelastic Behaviors 6 - 1 Instructional Material Complementing FEMA 451, Design Examples INELASTIC BEHAVIOR OF MATERIALS AND STRUCTURES This topic introduces the concepts of inelastic behavior, explains why the behavior is expected in seismic response, and shows how the inelastic behavior is incorporated into the NEHRP Recommended Provisions, ASCE 7, and the International Building Code (IBC).