Seismic fragility investigation of hybrid structures BRBF with eccentric-configuration and self-centering frame: Fid-Bau Portal

Seismic fragility investigation of hybrid structures BRBF with eccentric-configuration and self-centering frame

Gorji Azandariani, Mojtaba / Gholami, Mohammad

Abstract In this study, the incremental nonlinear dynamic analysis (IDA) is used to assess the seismic fragility investigation of hybrid structures with buckling-restrained braced frames with eccentric configuration (BRBFE) and self-centering frames. For this purpose, three systems BRBFE, BRBFE with the moment-resistant frame, and BRBFE with the self-centering frame, are designed and developed by numerical method for static pushover and IDAs. To prove the accuracy of the results of numerical studies, performed validation with experimental results. In this numerical study, 24 ground motions to perform IDAs are used, and IDA curves and fractile IDA curves are used to compare the seismic capacity of structures. Eventually, seismic fragility curves are plotted for structures in three performance levels of immediate occupancy (IO), repairability (RP), and collapse prevention (CP). The results showed that the BRBFE with moment-resistant frame was the most effective way to reduce the failure probability at IO performance level among the three systems. In contrast, the BRBFE with the self-centering frame was the most effective way to reduce the failure probability at two performance levels of RP and CP.

Highlights • Innovative hybrid system of BRBFE with self-centering frame (BRBFE-SCF) were proposed. • Seismic fragility analysis of hybrid structures BRBFE-SCF was performed. • The numerical model of BRBFE and SCF were developed to predict the hysteresis behavior. • Numerical models were analyzed by the nonlinear static pushover and incremental dynamic analysis methods. • The seismic behavior and performance of BRBFE-SCF and BRBFE-SCF were investigated.