Validating SSI Response of Buildings on Liquefiable Deposits using Centrifuge Testing and Numerical Modelling
The increasing shift towards performance based geotechnical earthquake engineering design requires an improved understanding of soil-structure interaction (SSI) for structures on liquefiable deposits. While a number of authors have used centrifuge tests and numerical modelling to study this phenomena, a limited number of studies have been undertaken where numerical models have been validated against well-instrumented physical model tests or centrifuge tests. As such, two of the centrifuge tests that were undertaken as part of the NEESR Seismic Performance Assessment in Dense Urban Environments project have been used to validate the ability of numerical simulations to model SSI for isolated structures on liquefiable deposits. The numerical simulations have been developed using FLAC and the PM4Sand constitutive soil model and OpenSees and PDMY02 constitutive soil model. The overall objective of the study is to validate the numerical model’s ability to capture both volumetric and deviatoric mechanisms by comparing against settlement, pore water pressure and accelerations measured, using a large array of instruments, in the centrifuge tests. This poster presents the validation of the numerical model’s ability to capture volumetric mechanisms by comparing 1D soil response simulations against free field measurements from the centrifuge tests. Additionally, an initial identification of the relative strengths and weaknesses of the two respective software packages and the two constitutive models is provided.
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