ABSTRACT
Isolated bridges are designed so that seismic energy is mainly dissipated at isolators. It is important that seismic safety and reparability of isolated bridges with deteriorated isolators are maintained as well as those with sound isolators. In this study, seismic failure modes of isolated bridges were evaluated considering uncertainties in the material and mechanical properties and aging deterioration of isolators. It was shown that response of isolated bridges is affected by deterioration of the lead core of the isolator and that failure probability of the isolator is mainly controlled by the rupture strain associated with deterioration of the rubber of the isolator.
