Influence of Relative Stiffness on Bending Moment in Raft Foundations

Abstract

This research article delves into the impact of raft and soil stiffness on the seismic behavior of soil-structure systems. Understanding soil-structure interaction under seismic loading is crucial for designing and analyzing structures in earthquake-prone regions. The stiffness of both the raft and the underlying soil significantly affects the dynamic response and overall performance of the system. To achieve the research objectives, an extensive numerical study employing advanced finite element analysis is conducted. Various scenarios are explored by systematically varying the stiffness properties of the raft and soil. The seismic response is assessed through structural displacements, accelerations, and stresses, as well as soil settlement and lateral soil pressures. The study's findings highlight the noteworthy influence of raft and soil stiffness on the seismic response of soil-structure systems. Higher raft stiffness tends to reduce structural displacements while increasing stress levels in the structure. On the other hand, softer soil stiffness amplifies the structural response, resulting in larger deformations. The outcomes of this research provide valuable insights for designing and optimizing soil-structure systems subjected to seismic forces. Engineers and researchers can utilize these findings to enhance the seismic performance of structures by appropriately selecting and adjusting the stiffness of the raft and soil, while considering site-specific conditions and design requirements.