Probabilistic Seismic Damage Analysis of Steel Self-Centering Concentrically Braced Frame Systems

Abstract eng:
This paper develops damage scenario fragilities for buildings with either special concentrically braced frame (SCBF) system or a self-centering concentrically braced frame (SC-CBF) system as the seismic lateral force resisting system. A preevent damage analysis is conducted using the damage scenario tree analysis (DSTA) technique and incremental dynamic analysis (IDA). The possibility of building demolition when collapse has not occurred is included in the DSTA. Three damage scenarios are considered: (i) building collapse; (ii) non-collapse with demolition; and (iii) non-collapse with non-demolition and component damage. Damage scenario fragilities for buildings with SCBF and SC-CBF systems are compared and discussed. The probabilities of damage to braces of the SCBF and SC-CBF at the maximum considered earthquake (MCE) hazard level are compared. Fragilities for the post tensioning bar damage scenarios for the buildings with the SC-CBF system are calculated and discussed. .Keywords: self-centering; damage scenario tree; probabilistic damage analysis; braced frames; rocking frames

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