Nonlinear analysis of base isolated buildings with curved surface sliders including over-stroke displacements

eismic isolation represents one of the most suitable strategies for mitigating the seismic risk of structures and infrastructures. Acceptable probabilities of collapse for seis-mically isolated buildings could be achieved by an appropriate isolator displacement capacity. This paper investigates the effects of the over-stroke capacity of double concave curved sur-face sliding isolators, in addition to the nominal displacement capacity, on the seismic response of base isolated structures. The case study building is a reinforced concrete frame structure designed for high hazard seismic site. The level of performance of global collapse prevention has been investigated considering the earthquake intensity levels at the Collapse Limit State (with a return period of 1000 years). The results of the nonlinear static and dynamic analysis highlights that the seismic isolation without the over-stroke capability show a limited margin against collapse for seismic intensities beyond the design limit state leve