Consideration of mainshock-aftershock sequences into performance-based seismic engineering

Document Type

Conference Proceeding

Publication Date



This paper investigates collapse probability of steel buildings from mainshock-aftershock sequences, as part of the ongoing research to develop a framework to integrate aftershock hazard into Performance-Based Engineering (PBE). During earthquake events, aftershocks can be observed following the mainshock. Aftershocks have the potential to cause severe damage to buildings and threaten life safety, even only minor damage is present from a mainshock. To date, the description of seismic hazard in PBE has not included the probability of aftershocks. Three approaches to generate collapse fragility for steel buildings that sustain certain level of damage from a mainshock are used to investigate the effects of mainshock-aftershock sequences. It is found that structural collapse capacity may reduce significantly when the building is subjected to a high intensity mainshock. As a result, the structure is likely to collapse even if only a small aftershock follows the mainshock. © 2013 American Society of Civil Engineers.

Publication Title

Structures Congress 2013: Bridging Your Passion with Your Profession - Proceedings of the 2013 Structures Congress