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Coupled Systems Mechanics Volume 13, Number 4, August 2024 , pages 293-310 DOI: https://doi.org/10.12989/csm.2024.13.4.293 |
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Effect of static and dynamic impedance functions on the parametric analysis of SSI system |
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Maroua Lagaguine and Badreddine Sbartai
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| Abstract | ||
| This paper investigates the dynamic response of structures during earthquakes and provides a clear understanding of soil-structure interaction phenomena. It analyses various parameters, comprising ground shear wave velocity and structure properties. The effect of soil impedance function form on the structural response of the system through the use of springs and dashpots with two frequency cases: independent and dependent frequencies. The superstructure and the ground were modeled linearly. Using the substructure method, two different approaches are used in this study. The first is an analytical formulation based on the dynamic equilibrium of the soil-structure system modeled by an analog model with three degrees of freedom. The second is a numerical analysis generated with 2D finite element modeling using ABAQUS software. The superstructure is represented as a SDOF system in all the SSI models assessed. This analysis establishes the key parameters affecting the soil-structure interaction and their effects. The different results obtained from the analysis are compared for each studied case (frequency-independent and frequency-dependent impedance functions). The achieved results confirm the sensitivity of buildings to soil-structure interaction and highlight the various factors and effects, such as soil and structure properties, specifically the shear wave velocity, the height and mass of the structure. Excitation frequency, and the foundation anchoring height, also has a significant impact on the fundamental parameters and the response of the coupled system at the same time. On the other hand, it have been demonstrated that the impedance function forms play a critical role in the accurate evaluation of structural behavior during seismic excitation. As a result, the evaluation of SSI effects on structural response must take into account the dynamic properties of the structure and soil accordingly. | ||
| Key Words | ||
| impedance function; seismic response; soil-structure interaction (SSI); viscoelastic model | ||
| Address | ||
| Maroua Lagaguine: Civil Engineering Laboratory-LGC, Badji Mokhtar-Annaba University, BP 12, 23100 Annaba, Algeria Badreddine Sbartai: LMGE Laboratory, Badji Mokhtar-Annaba University, BP 12, 23100 Annaba, Algeria | ||
