Abstract
This paper presents a new direct modeling approach to analyze 3D dynamic SSI systems including building structures resting on shallow spread foundations. The direct method consists of modeling the superstructure and the underlying soil domain. Using a reduced shear modulus and an increased damping ratio resulted from an equivalent linear free-field analysis is a traditional approach for simulating behavior of the soil medium. However, this method is not accurate enough in the vicinity of foundation, or the near-field domain, where the soil experiences large strains and the behavior is highly nonlinear. This research proposes new modulus degradation and damping augmentation curves for using in the near-field zone in order to obtain more accurate results with the equivalent linear method. The mentioned values are presented as functions of dimensionless parameters controlling nonlinear behavior in the near-field zone. This paper summarizes the semi-analytical methodology of the proposed modified equivalent linear procedure. The numerical implementation and examples are given in a companion paper.
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Behnamfar, F., Sayyadpour, H. The near-field method: a modified equivalent linear method for dynamic soil–structure interaction analysis. Part I: Theory and methodology. Bull Earthquake Eng 14, 2361–2384 (2016). https://doi.org/10.1007/s10518-016-9935-2
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DOI: https://doi.org/10.1007/s10518-016-9935-2