Seismic Evaluation of Steel Moment Frames Under Mainshock–Aftershock Sequence Designed by Elastic Design and PBPD Methods

Abstract

ABSTRACT Aftershocks can increase building vulnerability and decrease life-safety of the residents; nevertheless, no practical design method has yet been considered the seismic risk of aftershock. In this study, a new design method known as performance-based plastic design (PBPD) has been utilized instead of conventional elastic design (ED) for steel moment frames which considers nonlinear behavior of structures directly in the design process. Result of time-history analysis shows that drift increase due to aftershock for ED-frame is more than PBPD-frame. In addition, plastic hinge and hysteretic energy distributions for PBPD-frame when subjected to mainshock–aftershock sequence is more desirable than ED-frame.