Seismic performance assessment of eccentrically braced steel frames with energy-absorbing links under sequential earthquakes

Recent studies have indicated the need of considering aftershocks in seismic design/assessment structures. This article investigates effect sequential mainshock and aftershock earthquakes on eccentrically braced steel frames with vertical energy-absorbing links. To achieve this, 4, 8 12-storey frame buildings are modelled Perform3D® software non-linear behaviour materials components. The subjected to a set 12 main earthquake records corresponding required hazard level, then subsequent applied using incremental dynamic analysis (IDA). reduce computational cost, an alternative approach is also adopted by applying system followed pushover analyses damaged building assuming lateral load distribution proportional shape first vibration mode. Subsequently, fragility curves obtained for different damage levels, before after earthquake. results show that eccentric links comply well performance levels Iranian Seismic Code. study contributes toward assessment validation structures earthquakes.