International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 11 Issue: 03 | Mar 2024
p-ISSN: 2395-0072
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Effect of Soil Structure Interaction on High Rise RCC Building Sayali Rajendra Kadam1, Dr. Nitin Naik2, Dr.Prashant Sunagar3 1P.G. Student, Sanjivani College of Engineering, Kopargaon, Maharashtra State, India 2Professor, Dept. of Civil Engineering, Sanjivani College of Engineering, Kopargaon, Maharashtra State, India 3Professor, Dept. of Civil Engineering, Sanjivani College of Engineering, Kopargaon, Maharashtra State, India
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Abstract - The foundation, the surrounding and
The majority of civil structures include at least one component directly in contact with the ground. When external forces, such as earthquakes, act upon these systems, ground displacements and structure displacements become interdependent. Soil-structure interaction (SSI) describes the reciprocal influence between soil response and structural movements.
underlying soil, and the building itself form interconnected systems that collectively determine a structure's response to seismic activity. Evaluating the interplay between soil and structure is crucial in understanding their combined reaction to specific ground movements. In literature, the terms "soil-structure interaction" (SSI) and "soil-foundation-structure interaction" (SFSI) are often used interchangeably to describe this phenomenon. Despite the potential impact of SSI, structural engineers sometimes overlook its influence, assuming it has no detrimental effects on the structure. However, this assumption may not always hold true. Recognizing the foundation's critical role in the structure, this project adopts the term "SSI." For analytical purposes, we consider a B+S+24 R.C.C. building to compare the influence of SSI. Furthermore, we investigate two distinct soil types—soft soil and hard soil—by measuring their stiffness using techniques developed by Richart and Lysmer. Our analysis examines the advantages and disadvantages of soil-structure interaction. We conduct initial static analyses of the building, evaluating factors such as bending moment, shear force, and axial force for comparison. Subsequently, we contrast the impact on beams and columns with and without SSI. Dynamic response spectrum analysis is then applied to assess the building's behavior, including story drift, lateral displacement, base shear, and time period, with and without considering SSI. Our findings underscore the paramount importance of accounting for SSI, or soilfoundation-soil interaction, in structural assessments."
The degree of load redistribution within structural components is determined by the structural rigidity and the soil's capacity for settling under load. Consequently, numerous studies in the literature have investigated the impact of this factor. Traditional structural design methods often overlook the effects of SSI. While it may be reasonable to disregard SSI in light constructions on relatively hard soil, such as low-rise buildings and basic solid retaining walls, massive structures like skyscrapers, nuclear power stations, and highways situated on softer soils are significantly affected by SSI.
Fig -1: Interaction between structure, foundation plate and soil
Key Words: Soil structure interaction, framed structure, Behavior of foundation, ETABS, Response spectrum analysis
Yassine Razzouk et. al. (2023) aimed to investigate the impact of soil-structure interaction (SSI) on the seismic behavior of reinforced concrete buildings. A sophisticated numerical model for soil-structure interaction (SSI) was developed and validated using ABAQUS software. The seismic response of a twelve-story building was analyzed on four different types of soil (rock, dense soil, stiff soil, and soft soil) using a Normalized Response Spectra based on the Moroccan para seismic regulation RPS 2011. The study compared the global lateral displacement, interstory drift, and period for both column and shear wall bracing systems. The results revealed significant differences in seismic responses between shear wall bracing and column bracing in soil-structure systems, highlighting the
1. INTRODUCTION The term "soil-structure interaction" encompasses a range of processes that influence the response of soil to the presence of structures and vice versa, affecting how structures respond to the flexible soil beneath their foundations. Illustrated in Figure 1, a complete soilfoundation-structure system comprises a superstructure frame, its foundation, and the supporting soil. Differential settlement, stemming from variations in soil characteristics across different areas beneath the structure, can impact both axial forces and moments within structural members.
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