Validating numerical simulation of soil- structure interaction for building on liquefiable deposits using centrifuge experiments

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dc.contributor.advisor Hayden, C en
dc.contributor.advisor McGann, C en
dc.contributor.advisor Wotherspoon, L en
dc.contributor.author Balachandra, Ananth en
dc.date.accessioned 2019-09-23T03:43:49Z en
dc.date.issued 2019 en
dc.date.submitted 2019 en
dc.identifier.uri http://hdl.handle.net/2292/47912 en
dc.description Full Text is available to authenticated members of The University of Auckland only. en
dc.description.abstract The increasing shift towards performance-based geotechnical earthquake engineering design requires an improved understanding of soil-structure interaction (SSI) for buildings 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 centrifuge tests. The focus of this research is to validate numerical simulations of 'free-field' conditions and numerical simulations of soil-structure interaction response of isolated buildings on liquefiable deposits against measurements from a centrifuge experiment. The 1D simulations for this study have been developed using the PM4Sand constitutive soil model as implemented in FLAC and the PDMY02 constitutive soil model as implemented in OpenSEES. The consideration of two soil models is one of the distinctive features of this study, as one of the objectives of this research is to compare the relative performance of the two constitutive soil models. The 2D numerical simulations to assess the soil-structure interaction response of isolated structures were developed using the PM4Sand constitutive soil model as implemented in FLAC. The 1D validation that was undertaken in this study show relatively good agreement between the simulated and measured accelerations and excess pore pressures using PM4Sand and PDMY02 for up to moderate levels of earthquake shaking. At high levels of earthquake shaking, good results were obtained using PM4Sand but a poor match with measured values was obtained using the PDMY02 model. The centrifuge experiment results appeared to show that the ground motion properties such as duration and the presence of 'pulse-like' qualities have an influence on the measured acceleration and excess pore pressure response even if the intensity of shaking is relatively similar. However, this distinction was generally not captured by the two constitutive soil models considered in this study. Additionally, both of the constitutive soil models significantly underestimated volumetric settlements in the 'free-field'. The 2D validation undertaken in this study showed that, while the numerical simulations were not able to capture volumetric settlements well, the simulations using PM4Sand generally provided good estimates of total settlement of the structure. The numerical simulations also provided relatively comparable acceleration response in the soil beneath the structures and the ii acceleration response at the base and top of the structure. However, more variability between the measured and simulated excess pore pressure response in the liquefiable soils was noted. The research undertaken in this study shows that numerical simulations are generally able to capture important mechanisms due to liquefaction. In this study, a better response was obtained using the PM4Sand constitutive soil model when simulating 'free-field' conditions. However, it should be noted that this observation is based on comparisons against one centrifuge experiment and for the soil parameters adopted in this study. en
dc.publisher ResearchSpace@Auckland en
dc.relation.ispartof Masters Thesis - University of Auckland en
dc.relation.isreferencedby UoA99265200914102091 en
dc.rights Items in ResearchSpace are protected by copyright, with all rights reserved, unless otherwise indicated. Previously published items are made available in accordance with the copyright policy of the publisher. en
dc.rights Restricted Item. Full Text is available to authenticated members of The University of Auckland only. en
dc.rights.uri https://researchspace.auckland.ac.nz/docs/uoa-docs/rights.htm en
dc.rights.uri http://creativecommons.org/licenses/by-nc-sa/3.0/nz/ en
dc.title Validating numerical simulation of soil- structure interaction for building on liquefiable deposits using centrifuge experiments en
dc.type Thesis en
thesis.degree.discipline Civil Engineering en
thesis.degree.grantor The University of Auckland en
thesis.degree.level Masters en
dc.rights.holder Copyright: The author en
pubs.elements-id 781936 en
pubs.record-created-at-source-date 2019-09-23 en


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