Effects of Soil-Structure Interaction on the Seismic Response of Building Considering Three Categories of Soil
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Date
2025-05-01
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Addis Ababa University
Abstract
The primary aim of this study was to investigate the influence of soil-structure interaction (SSI) on the seismic performance of a building under three different soil categories. To achieve this, the behavior of a structure placed on three categories of soil—hard, medium, and soft—was assessed. A comprehensive literature review was conducted to understand the fundamental concepts of SSI, the techniques used to analyze it, and its influence on the seismic demands of buildings. The adopted methodology began with site assessment and gathering the geometric data of the building. Subsequently, a standard 11 story hospital building was analyzed following European standards. The underlying soil was modeled using the direct approach to account for soil flexibility. The building was then subjected to the 1952 Hollywood Storage earthquake, utilizing Midas Gen and Midas GTS NX for structural and geotechnical analysis, respectively. The results were evaluated and compared based on vibration period, lateral deformation, inter-story drift, bending moment, and shear force, across different soil conditions. Findings indicated that as the stiffness of the subsoil decreases, the influence of SSI on the building's seismic response becomes more significant and adverse. Specifically, SSI led to an increase in vibration period, lateral displacement, and inter-story drift, especially on soft soil. These results emphasize the importance of considering SSI in the dynamic design of buildings on soft soil to ensure structural safety.
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Seismic soil-structure interaction (SSI), soil flexibility, Hollywood storage earthquake