Piled raft foundations for multi-storied buildings have gained significant adaptation recently due to their advantages over the conventional foundation types from bearing capacity and settlement perspectives. Understanding the piled raft behavior under earthquake loads is highly relevant as it can affect the performance and stability of the superstructure. In this study, 3D finite element simulations are performed to investigate the response of large piled raft foundations in clayey soil under different earthquake loading conditions. The pseudo-static approach has been employed by replacing real earthquake load with a corresponding horizontal static load that is applied at the level of the raft. A parametric study has been carried out to observe the influence of different foundation geometrical parameters such as pile spacing, length, and thickness of raft. The results are expressed as lateral pile load-sharing ratio, pile shear force, lateral displacement of the pile, and pile bending moment. Results show that for a greater pseudo-static load, the lateral pile load-sharing ratio remains almost the same; however, pile shear force, lateral pile displacement, and pile bending moment increase. The lateral pile load-sharing ratio reduces for closer spacing between piles or piles shorter in length. The pile shear force decreases with the reduction in pile spacing. However, for closer pile spacing or increased raft thickness, the shear force decreases only for head row piles. For closer spacing, lateral pile displacement is greater for the trailing row piles than for the head row piles. A trend reversal is noted for piles shorter in length. A greater raft thickness results in a higher pile bending moment, with the maximum moment noted at the pile head, and along the length of the pile it changes from positive value to negative with a negligible value at the pile tip.