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http://dx.doi.org/10.7734/COSEIK.2016.29.4.317

Nonlinear Earthquake Response Analysis of a Soil-Structure Interaction System Subjected to a Three-Directional Ground Motion  

Lee, Jin Ho (High-speed Railroad Systems Research Center, Korea Railroad Research Institute)
Kim, Jae Kwan (Department of Civil & Environmental Engineering, Seoul National University)
Kim, Jung Han (Integrated Safety Assessment Division, Korea Atomic Energy Research Institute)
Publication Information
Journal of the Computational Structural Engineering Institute of Korea / v.29, no.4, 2016 , pp. 317-325 More about this Journal
Abstract
In this study, nonlinear earthquake responses of a soil-structure interaction(SSI) system which is subjected to a three-directional ground motion are examined. The structure and the near-field region of soil, where the geometry is irregular, the material properties are heterogeneous, and nonlinear dynamic responses are expected, are modeled by nonlinear finite elements. On the other hand, the infinite far-field region of soil, which has a regular geometry and homogeneous material properties and dynamic responses is assumed linearly elastic, is represented by three-dimensional perfectly matched discrete layers which can radiate elastic waves into infinity efficiently. Nonlinear earthquake responses of the system subjected to a three-directional ground motion are calculated with the numerical model. It is observed that the dynamic responses of a SSI system to a three-directional motion have a predominant direction according to the characteristics of the ground motion. The responses must be evaluated using precise analysis methods which can consider nonlinear behaviors of the system accurately. The the method employed in this study can be applied easily to boundary nonlinear problems as well as material nonlinear problems.
Keywords
soil-structure interaction; perfectly matched discrete layer; earthquake response analysis; material nonlinearity;
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