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Influence of foundation flexibility on seismic fragility of reinforced concrete high-rise buildings
Abstract This study investigated the effect of foundation type and layout on the seismic vulnerability of tall reinforced concrete buildings using fragility curves. To this end, the seismic fragility of 12-, 18-, and 24-story buildings sitting on shallow and pile foundations (i.e., with rigid and flexible pile caps) were evaluated. The uncertainty in the structural and soil properties was assessed by using the Latin Hypercube Sampling method and the seismic uncertainty was incorporated using several near- and far-field earthquakes. The results showed that the use of flexible pile caps reduced the seismic fragility and base shear of superstructures compared to the piled structures with rigid pile caps. Furthermore, the flexible pile caps improved the seismic performance of pile foundations by reducing the earthquake-induced pile head forces and deflection. The findings of this study can help the engineers to select the appropriate foundation layout to optimize the seismic performance of buildings.
Highlights Soil-foundation-structure interaction influences the fragility of tall buildings. Latin Hypercube Sampling method generates random variables to consider uncertainties. Using flexible pile caps decreases the seismic fragility of tall piled buildings. Sequence of damages occurred in buildings depends on the flexibility of foundation. Using flexible pile cap improves the seismic performance of pile foundations.
Influence of foundation flexibility on seismic fragility of reinforced concrete high-rise buildings
Abstract This study investigated the effect of foundation type and layout on the seismic vulnerability of tall reinforced concrete buildings using fragility curves. To this end, the seismic fragility of 12-, 18-, and 24-story buildings sitting on shallow and pile foundations (i.e., with rigid and flexible pile caps) were evaluated. The uncertainty in the structural and soil properties was assessed by using the Latin Hypercube Sampling method and the seismic uncertainty was incorporated using several near- and far-field earthquakes. The results showed that the use of flexible pile caps reduced the seismic fragility and base shear of superstructures compared to the piled structures with rigid pile caps. Furthermore, the flexible pile caps improved the seismic performance of pile foundations by reducing the earthquake-induced pile head forces and deflection. The findings of this study can help the engineers to select the appropriate foundation layout to optimize the seismic performance of buildings.
Highlights Soil-foundation-structure interaction influences the fragility of tall buildings. Latin Hypercube Sampling method generates random variables to consider uncertainties. Using flexible pile caps decreases the seismic fragility of tall piled buildings. Sequence of damages occurred in buildings depends on the flexibility of foundation. Using flexible pile cap improves the seismic performance of pile foundations.
Influence of foundation flexibility on seismic fragility of reinforced concrete high-rise buildings
Ansari, Mojtaba (author) / Nazari, Maryam (author) / Panah, Ali Komak (author)
2020-11-27
Article (Journal)
Electronic Resource
English
Seismic fragility relationships of reinforced concrete high-rise buildings
| Online Contents | 2009
| British Library Online Contents | 2016
| Taylor & Francis Verlag | 2020