Increasing demand for high-rise buildings and other important structures in urban areas and unfavorable land has resulted to opt for piled raft foundation by the designers. The present study is an attempt to investigate the seismic behavior of piled raft foundation supporting structural system embedded in very soft clay encompassing variations of different influential parameters. The piled raft system is modeled using three-dimensional (3D) finite element analysis. At first, the 3D numerical model is validated with past numerical studies. This is followed by a detailed parametric study on the effect of different influential parameters, such as flexibility of raft, pile spacing to diameter ratios, and asymmetry in pile length on dynamic characteristics and seismic response of the piled raft foundation system considering dynamic soil-structure interaction (DSSI). It is observed that the fundamental period of the structure gets significantly lengthened with increasing raft flexibility whereas pile head shear considerably reduced. Further, non-identical pile lengths attributing asymmetric group configuration results in a significant change in the fundamental period of the structure and pile head shear.

对城市地区和不利土地上的高层建筑和其他重要结构的需求不断增加，导致设计师选择了桩筏基础。本研究是研究埋入非常软粘土中的桩筏基础支撑结构体系的地震行为的方法，该结构包含不同影响参数的变化。桩筏系统是使用三维（3D）有限元分析建模的。首先，通过过去的数值研究验证了3D数值模型。接下来是对不同影响参数的影响进行详细的参数研究，例如木筏的柔韧性，桩距与直径之比，桩长度的不对称性对考虑动态土-结构相互作用（DSSI）的桩筏基础系统动力特性和地震响应的影响。可以观察到，随着筏板挠性的增加，结构的基本周期明显延长，而桩头的剪切力却大大降低。此外，归因于不对称群构型的不相同的桩长导致结构的基本周期和桩头剪切的显着变化。