ASCE (2007) guidelines for the rehabilitation of existing buildings define specific performance levels for immediate occupancy, life safety and collapse prevention, where collapse prevention is defined as "the post earthquake damage state in which the building is on the verge of partial or total collapse".
IO immediate occupancy, LS life safety, CP collapse prevention.
O operational, IO immediate occupancy, LS life safety, CP collapse prevention.
Finally, fragility curves for three performance levels (immediate occupancy, life safety, and collapse prevention) and engineering demand hazard curves are generated using the developed probabilistic demand models.
Despite recent advances in mine health and safety, roof collapse and instabilities are still the leading causes of injury and fatality in underground mining operations.
The maximum story drift for the hybrid frames was determined and compared with the "life safety" and "collapse prevention" performance limits, as recommended by FEMA 356 [12].
The maximum story drift for the hybrid frames are determined and compared to the "life safety" and "collapse prevention" limits as recommended by the FEMA 356.
This study presents an energy-based approach to the performance-based optimization of steel moment resisting frames at the so-called operational, immediate occupancy, life safety and collapse prevention performance levels.
But for life safety and collapse prevention PLs, the maximum inter-storey drift of the building retrofitted with the PRS is considerably smaller than that of the one retrofitted with SISPs.
Furthermore, compared with the building retrofitted with SISPs, the building retrofitted with the PRS experiences significantly less damage due to the more ductile behavior of the system at the life safety and collapse prevention PLs.
