Experimental and Empirical Evaluation of Kinematic Soil-Structure Interaction Effects in Large and Deeply Embedded Foundations
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Authors
Zogh, Peiman
Issue Date
2024
Type
Dissertation
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Abstract
Kinematic soil-structure interaction (SSI) effects are pivotal in determining the seismic response of buildings, particularly in infrastructures like power plants, which are characterized by large footprints and deep embedment depths of their foundations. Kinematic SSI effects can be estimated by simplified semi-empirical models in various seismic design guidelines focusing on buildings with smaller, shallower foundations. These simplified models cannot be usable for buildings with large footprints and deeper foundations. Furthermore, kinematic SSI effects in such structures can significantly deviate from those in conventional buildings, primarily due to base slab averaging and embedment depth effects. This dissertation addresses this knowledge gap through a two-phase approach: an empirical analysis of earthquake motion data from instrumented sites in Japan and 1 - g shake table model tests. The empirical component evaluated how large foundations influence seismic responses, underscoring the limitations of current simplified kinematic SSI effects models. Findings revealed that these models, suitable for regular buildings, substantially overestimate foundation motions in large, deeply embedded foundations. The experimental aspect simulated various foundation sizes and embedment depths, offering insights into the impact of base slab averaging and embedment depth effects. Key findings include notable discrepancies in kinematic SSI effects for vertical versus horizontal recordings, significant influence of foundation properties on higher-frequency motions, and the need for correction equations in kinematic SSI effects models to incorporate foundation complexities. Integrating empirical and experimental investigation can enhance seismic safety standards for critical infrastructures. This study advances the understanding of kinematic SSI effects in buildings with large foundations, focusing on critical infrastructures. Modified kinematic SSI models are suggested, accounting for the unique foundation characteristics of large foundations. In addition, future research directions include developing generalized correction equations, integrating findings with advanced computational models, and expanding the study to cover diverse seismic scenarios and a broader range of foundation sizes and embedment depths.
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Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International