Akademik Veri Yönetim Sistemi
Structures, cilt.81, 2025 (SCI-Expanded)
This study investigates the structural pounding effects on seismic fragility analysis of base isolated buildings. In the literature, the scenarios of superstructure pounding in base-isolated buildings and the impact of ground motion characteristics on pounding-induced responses have been covered in a limited number of studies. Therefore, the key variables in the research were pounding configurations, separation distances between adjacent structures, and ground motion characteristics. Three pounding configurations were analyzed: (i) pounding between a base-isolated building and a four-story fixed-base building, (ii) pounding between a base-isolated building and a two-story fixed-base building, and (iii) pounding between superstructure of base-isolated building and moat wall. The separation distances between the base-isolated and adjacent structures were set at 25 %, 50 %, 75 %, and 100 % of the total design displacement. Nonlinear time-history analyses were performed for three ground motion sets: (i) near-field with pulse, (ii) near-field with no pulse, and (iii) far-field. Fragility curves were developed using the multiple stripes analysis method and are fitted using the maximum likelihood method. The findings revealed that separation distance significantly impacted damage probabilities, especially for moderate to collapse states. As the separation distance decreased, the probability of exceeding higher damage states increased markedly. Moreover, the study showed that near-field with pulse ground motions resulted in the highest probabilities of severe damage due to high-energy velocity pulses. On the other hand, the fragility curves revealed that the pounding configuration had the potential to significantly alter structural behavior.