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.

中文翻译：

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基础柔性对钢筋混凝土高层建筑抗震脆弱性的影响

摘要 本研究利用脆性曲线研究了基础类型和布局对高层钢筋混凝土建筑物地震易损性的影响。为此，对浅层和桩基（即刚性和柔性桩帽）上的 12、18 和 24 层建筑物的地震脆弱性进行了评估。结构和土壤特性的不确定性是通过使用拉丁超立方采样方法评估的，地震不确定性是使用几个近场和远场地震来合并的。结果表明，与刚性桩帽的桩结构相比，柔性桩帽的使用降低了上部结构的地震脆性和基础剪力。此外，柔性桩帽通过减少地震引起的桩头力和挠度，提高了桩基的抗震性能。这项研究的结果可以帮助工程师选择合适的基础布局，以优化建筑物的抗震性能。