Impact of Earthquake loads on different foundation systems by using ETAB

DOI

https://www.doi.org/10.59256/ijrtmr.20250503001

Published In

Volume 5, Issue 3 (2025)

Published Online

May-June 2025

Pages

01-16

Article Type

Original Article

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Earthquakes pose a significant challenge to structural stability, making it essential to design buildings with foundation systems that can effectively withstand seismic forces. The foundation of a structure plays a critical role in dissipating seismic energy and ensuring the safety of the superstructure. Two Different types of foundation systems respond differently to earthquake loads, depending on soil conditions, structural weight, and dynamic forces. This study focuses on analyzing the impact of seismic loads on two different foundation systems raft foundation, and strap footing using ETABS software and Safe software as foundation design tool. The objective of this research is to evaluate and compare the seismic performance of these foundation systems when subjected to earthquake loads. A single building structure will be modeled and analyzed using ETABS, with three variations in its foundation system. The comparative analysis will help determine which type of foundation between Raft and Isolated footing is most effective in minimizing structural displacement, base shear, and overall stresses during an earthquake. The study aims to provide valuable insights into the suitability of each foundation type in seismic-prone areas. Since foundation behavior depends on multiple site-specific factors such as soil properties, groundwater conditions, and seismic zoning, this study will use randomly assumed input data rather than being based on a specific site. This approach ensures that the analysis remains generalized and applicable to a wide range of seismic conditions. The results obtained will be evaluated based on key structural response parameters, such as lateral displacement, inter-story drift, and foundation settlements, to assess the efficiency of each foundation system. The primary objective of this study is to analyse and compare the seismic performance of raft, and isolated foundations using ETABS software and safe as foundation design tool. A common building structure will be modelled, and the two foundation systems will be applied separately to evaluate their responses under earthquake loads. Key parameters such as base shear, lateral displacement, and settlement will be examined to determine the most effective foundation type for seismic resistance. The study will focus on the structural behavior of these foundation systems rather than site-specific characteristics; hence, the input data for the analysis will be assumed randomly instead of being derived from a specific location.