Effect of Aftershocks on Seismic Fragilities of Single-Story Masonry Structures

The effect of aftershocks on the fragility single-story masonry structures is investigated using probabilistic seismic demand analysis Finite element models an unreinforced (URM) structure and a confined (CM) are established their response characteristics when subjected to mainshock, aftershock, mainshock-aftershock sequence then comparatively investigated. effects use confining members studied. Probabilistic built, curves under various conditions derived investigate structural fragility. maximum roof displacement inter-story drift ratio lower in model than model; additionally, probability exceedance (PE) values each damage limit state reduced, those mainshock-damaged aftershock significantly increase compared directly same-intensity aftershock. severe or collapse with CM greater same intensity benefits resistance reduces failure structure. PE scaling factor δ . Therefore, should be considered design structures.