International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 11 Issue: 09 | Sep 2024
p-ISSN: 2395-0072
www.irjet.net
SEISMIC ANALYSIS OF SOIL STRUCTURE INTERACTION OF PILE FOUNDATION USING FEM Gaurav Shrivastav1, Dr. Devnita Polley2 1Department of Civil Engineering, Pacific University, Udaipur 2Assistant Professor, Department of Civil Engineering, Pacific University, Udaipur
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Abstract- Seismic Soil-Structure Interaction (SSI) is a fundamental aspect of civil engineering and structural dynamics, particularly in the design and analysis of structures subjected to earthquake excitations. Understanding the behavior of structures in seismic events requires more than just analyzing the structural components in isolation; it necessitates the incorporation of the surrounding soil's properties, as well as the interaction between the soil and the structure. This complex interplay can significantly alter the dynamic response of both the structure and the soil, leading to a more comprehensive understanding of seismic performance. This study investigates the phenomenon of SSI using the finite element analysis (FEA) software ANSYS, a powerful tool for simulating the interaction between structural and geotechnical systems. The main objective of this research is to develop a robust computational model within ANSYS to simulate seismic SSI and analyze its effects on structural responses during earthquake loading. The methodology adopted integrates the dynamic properties of soils, including non-linear behavior, damping, and wave propagation, alongside detailed structural modeling. By focusing on the interaction at the interface between the soil and structure, this study explores how seismic waves traveling through the soil medium affect the structural response, considering the mutual feedback mechanisms. Keyword: Soil structure interaction, Seismic analysis, wave propagation, finite element analysis.
1. IntroductionSeismic analysis of soil stands as a pivotal domain within geotechnical engineering, illuminating the intricate interplay between seismic forces and the geological substratum upon which infrastructure rests. Spanning an array of methodologies, from laboratory testing to sophisticated computational models, this discipline plays a fundamental role in ensuring the safety and resilience of structures in earthquake-prone regions worldwide. To embark on a comprehensive exploration of seismic analysis of soil, it is essential to first comprehend the seismic hazard faced by a particular region. Earthquake hazard analysis involves assessing the likelihood of seismic events of varying magnitudes occurring over a specified period, often informed by historical seismicity, fault mapping, and probabilistic models. One prominent method employed in seismic analysis of soil is the use of numerical modeling techniques, such as finite element analysis (FEA) and boundary element method (BEM), to simulate soil-structure interaction under seismic loading. These models discretize the soil mass into finite elements or boundary elements, allowing for the calculation of stresses, strains, and displacements within the soil and adjacent structures. By coupling these models with earthquake ground motion records, engineers can simulate the dynamic response of soil-structure systems, assessing factors such as foundation settlement, soil liquefaction potential, and structural deformations.
2. Problem StatementThe primary challenge in seismic analysis of soil foundations is the accurate prediction of the dynamic interaction between soil and structure under seismic loading. This involves understanding and modeling the nonlinear behavior of soils, accounting for soil heterogeneity, and incorporating the effects of soil-structure interaction in numerical simulations. Key issues include: Nonlinear Soil Behavior: Soils exhibit highly nonlinear behavior under seismic loading, characterized by variations in stiffness, damping, and potential for liquefaction. Current models often oversimplify these behaviors, leading to inaccurate predictions of soil and foundation responses.
3. MethodologySeismic analysis of pile and soil foundations assesses the structural integrity and performance of foundation systems when subjected to seismic forces. Utilizing ANSYS, a robust finite element analysis (FEA) software, this methodology provides a
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