International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 12 Issue: 05 | May 2025
p-ISSN: 2395-0072
www.irjet.net
NON-LINEAR STATIC ANALYSIS OF MOMENT RESISTING RC STRUCTURES OF VARIOUS GEOMETRY BY CONSIDERING SOIL STRUCTURE INTERACTION Pushkar Chavan1, Prof. Vishwajeet Kadlag2 1 P.G. Student, Ajeenkya DY Patil School of Engineering, Lohegaon, Pune, Maharashtra, India. 2 Professor, Dept. of Structural Engineering, Ajeenkya DY Patil School of Engineering, Lohegaon,
Pune, Maharashtra, India
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forces, particularly lateral loads like earthquakes. The soil’s flexibility affects displacement, stability, and internal forces, making this interaction crucial in soft or layered soil conditions. Pushover Analysis is a nonlinear static approach of designed to find out a structure's behavior under lateral loading conditions. By gradually applying increasing loads, the analysis tracks deformation and the formation of plastic hinges, offering insights into structural behavior during seismic events. Soil-Structure Interaction (SSI) refers to the process in which seismic activity affects both the underground soil and the structure above it, creating a mutual influence. As the ground moves, the structure’s response alters the soil movement, leading to a dynamic relationship between the two. While SSI has a negligible impact on rigid soil and low-rise structures, it becomes a crucial factor in designs involving soft soil, highrise buildings, roadways, heavy structures, nuclear power plants, and hydraulic systems. This simplified approach may be suitable for certain structures and soil types, such as lightweight buildings on relatively firm ground. However, this assumption does not always hold. Ignoring SSI in structural analysis can negatively influence stability and lead to unsafe designs, affecting both the superstructure and the foundation.
Abstract - Pushover analysis, also known as nonlinear static
analysis, is a widely used method for assessing the seismic performance of structures. This study applies pushover analysis to evaluate a G+10 multistoried building under different most sever seismic zone using ETABS21.2.0 software. The results evaluate the behavior of the structure in terms of the maximum displacement corresponding to the base shear. Additionally, the research examines the influence of SoilStructure Interaction (SSI) on the seismic performance of the building, comparing models of various geometry with and without SSI considerations. The symmetric-plan reinforced concrete (RC) building is designed following IS 456:2000 guidelines and analyzed using ETABS21.2.0 software under two boundary conditions: fixed-base and nonlinear static pushover analysis accounting for soil-structure interaction. Key Words: RC frame, Soil Structure Interaction (SSI), Pushover analysis, Soil type, Support Conditions, Plastic Hinges, Performance Point.
1.INTRODUCTION
An effectively engineered structure must exhibit four key qualities: straight forward and organic design, strong lateral stability, ample stiffness, and sufficient ductility. Buildings with a standard, straightforward configuration tend to sustain less damage in both design and elevation compared to those with irregular configurations. According to IS 1893-2016, a construction project is considered irregular when it lacks uniformity in configuration, mass distribution, or capacity-resistant elements. Such irregularities can disrupt the continuity of force flow and stress concentrations. This study primarily aims to assess how a structure responds under various external influences. These influences include gust or wind pressure, vibrations, traffic movement, blasts, and seismic activity. Any design can be subjected to unpredictable loads, making structural configuration a critical factor in determining a building’s overall performance. In the case of severe earthquakes, structural imbalance can result in excessive lateral loading, overwhelming the building’s capacity and leading to significant damage Soil-Structure Interaction (SSI) describes how a structure and its foundation soil influence each other under external
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2. LITERATUR REVIEW
Jonathan P. Stewart (1) Outlined approaches to assess the influence of inertial soil-structure interaction (SSI) on the seismic behavior of structures. Their approach builds on existing building code provisions, offering improvements by including the effects of foundation embedding, flexibility, and shape on site conditions and foundation impedance. Using data from buildings impacted by the 1994 Northridge earthquake, the authors demonstrated the accuracy of their methods in predicting SSI effects. The study involved two primary analyses: 1. A simplified design approach to predict the period extension ratio and foundation damping coefficients for structures with surface (MV) or embedded (MV or MB) foundations. 2. A system identification method to determine the modal vibration parameters of structures with fixed and flexible bases using strong seismic motion data.
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