Cyclic Pushover Method for Seismic Assessment under Multiple Earthquakes

Abstract

A new method for the seismic performance assessment of structures subjected to a sequence of earthquakes is presented. The method is based on the cyclic pushover analysis of a multi-degree-of-freedom (MDOF) structure. Instead of relying on a single value of target displacement, as in the case of monotonic push-over methods, a simplified cyclic displacement history is derived from an equivalent single-degree-of-freedom (SDOF) structure for the assessment of the MDOF one. The main advantage of the method is that it directly accounts for cyclic degradation of the actual MDOF system while retaining the simplicity and computational efficiency of SDOF systems for displacement demand evaluation, thus making it attractive for practical applications. The procedure is exemplified in detail using ductile and nonductile reinforced concrete (RC) frames as benchmark structures subjected to the Central Italy sequence. Further comparison with fully nonlinear time-history analysis and code-prescribed monotonic pushover is provided in order to assess the accuracy and advantages of the proposed method.

Peak and Cumulative Response of Reinforced Concrete Frames with Steel Damper Columns under Seismic Sequences

“…Similarly, they concluded that the influence of major aftershocks on the damage potential is significant because the energybased damage index of tall RC buildings increases due to the seismic sequences. In addition to these studies, Zhai et al [30][31][32], Di Sarno et al [33][34][35][36], Abdelnaby et al [37][38][39][40][41], Kagermanov and Gee [42,43], Yang et al [44,45], Yaghmaei-Sabegh et al [46], Qiao et al [47], Orlacchio et al [48], Hoveidae and Radpour [49], and Pirooz et al [50] investigated the nonlinear response of building structures under seismic sequences. Although most of those studies were analytical in nature, one experimental study used a shaking table [47].…”

“…From the author's viewpoint, few studies have investigated the application of the pushover-based procedure using a nonlinear equivalent SDOF model for the seismic evaluation of a building considering seismic sequences; the existing studies are those of Guerrero et al [21], Kagermanov and Gee [42,43], and Orlacchio et al [48]. Such studies are essential in the author's opinion.…”

Peak and Cumulative Response of Reinforced Concrete Frames with Steel Damper Columns under Seismic Sequences

“…because the energy-based damage index of tall RC buildings increases due to the seismic sequences. In addition to these studies, Zhai et al [30][31][32][33], Di Sarmo et al [33][34][35][36], Abdelnaby et al [37][38][39][40][41], Kagermanov and Gee [42,43], Yang et al [44,45], Yaghmaei-Sabegh et al [46], Qiao et al [47], Orlacchio et al [48], Hoveidae and Radpour [49], and Pirooz et al [50] investigated the nonlinear response of building structures under seismic sequences. Although most of those studies were analytical in nature, one experimental study used a shaking table [47].…”

Peak and Cumulative Response of Reinforced Concrete Frames with Steel Damper Columns under Seismic Sequences

“…Similarly, they had concluded that the influence of major aftershocks on the damage potential is significant because the energy-based damage index of tall RC buildings increases due to the seismic sequences. In addition to these studies, Zhai et al [30][31][32][33], Di Sarno et al [33][34][35][36], Abdelnaby et al [37][38][39][40][41], Kagermanov and Gee [42,43], Yang et al [44,45], Yaghmaei-Sabegh et al [46], Qiao et al [47], Orlacchio et al [48], Hoveidae and Radpour [49], and Pirooz et al [50] investigated the nonlinear response of building structures under seismic sequences. Although most of those studies were analytical in nature, one experimental study used a shaking table [47].…”