Seismic fragility assessment requires a large number of data points and reliable numerical models which can predict the responses of structures under a wide range of excitation intensities. Nonlinear time history analysis method has been traditionally used to develop seismic fragility curves in which the reliability of the fragility curves largely depends on the accuracy of the numerical models. In this research, the seismic fragility of Self-Centering Energy Dissipative (SCED) Bracing Systems is assessed through hybrid simulations using UI-SimCor. The SCED Bracing System which has been actively developed by Prof. Christopoulos' research group at University of Toronto can sustain large inter-story drift, has ability to dissipate energy, and does not develop permanent deformation. Since numerical models have inherent limitation due to simplification of complicated force-deformation relationship, over thirty hybrid simulations of a six-storey steel structure are carried out to experimentally derive seismic fragility curves. The SCED Brace in the first floor of the structure is experimentally modeled in full scale while the rest of the building is numerically represented. The simulation results show that the SCED Brace system can sustain MCE level ground motion without developing noticeable inelastic deformation and meeting drift requirements. The experiments also demonstrated that the hybrid simulation is a reliable experimental method for seismic fragility assessment of structures.
Credits and References
Kammula, V., Erochko, J., Kwon, O., and Christopoulos, C. (2012). “Performance Assessment of the Self Centering Energy Dissipative ( SCED ) Bracing System using Hybrid Simulation.” 15th World Conference on Earthquake Engineering, Lisbon, Portugal.
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