The Near-Field Method: a Modified Equivalent Linear Method for Dynamic Soil-Structure Interaction Analysis

Abstract eng:
In this research the problem of soil-structure interaction analysis with the direct method is studied. 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 and the numerical implementation and examples of the proposed modified equivalent linear procedure.

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