Seismic fragility analysis of coupled building‐slope systems

Abstract Buildings located on hill slopes are subjected to additional effects under seismic action compared with those flat ground. This article presents Incremental Dynamic Analyses of coupled building‐slope systems incorporating topographic amplification, nonlinear slope movement and irregular structural configuration hill‐side buildings. Two different stable slopes, supporting single multiple adjacent ductile moment resisting reinforced concrete frame buildings step‐back configuration, prevalent in Indian Chinese hilly regions, modelled analyzed using the finite element software ABAQUS. A suite 21 ground motions is incrementally scaled used compute response system. Fragility curves for damage states, derived as lognormal probability distributions terms three Intensity Measures (IMs) probabilities considered buildings, compared. The spectrum‐based IMs (e.g., spectral acceleration at fundamental period, average over a period range) result lower record‐to‐record variability, peak IM. results reveal that ignoring effect significantly underestimates fragility all states.