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NONLINEAR SITE RESPONSE ANALYSES AND HIGH FREQUENCY DILATION PULSES
Session: Earthquakes and Geohazards I / Séismes et géoaléas I
Graeme McAllister, University of British Columbia (Canada)
Mahdi Taiebat, University of British Columbia (Canada)
Alborz Ghofrani, University of Washington (United States)
Long Chen, University of Washington (United States)
Pedro Arduino, University of Washington (United States)
Nonlinear seismic site response analyses can provide an accurate representation of soil behaviour in response to the propagation of seismic waves. However their use has been limited in conventional engineering practice due to the perceived complexity in parameter selection and usage protocols. Moreover, both total and effective stress nonlinear analyses can be conducted to evaluate seismic site response. It would be insightful from a practical point of view to explore the difference in results when either a total or effective nonlinear analysis is carried out using an advanced soil constitutive model. In this paper, the critical state bounding surface plasticity constitutive model SANISAND is used to investigate the nonlinear response of a thin sand surface layer subjected to seismic loading. The importance of modeling the porous solid-pore fluid interaction is explored and the site response high frequency ground motion is suggested to be caused by dilation pulses during the soil phase transformation process.
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