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dc.contributor.authorJeong, Seokhoen_NZ
dc.contributor.authorAsimaki, Domnikien_NZ
dc.contributor.authorDafni, Jacoben_NZ
dc.contributor.authorWartman, Josephen_NZ
dc.date.accessioned2019-08-06T03:44:05Z
dc.date.available2019-01-01en_NZ
dc.date.available2019-08-06T03:44:05Z
dc.date.issued2019en_NZ
dc.identifier.citationJeong, S., Asimaki, D., Dafni, J., & Wartman, J. (2019). How topography-dependent are topographic effects? Complementary numerical modeling of centrifuge experiments. Soil Dynamics and Earthquake Engineering, 116, 654–667. https://doi.org/10.1016/j.soildyn.2018.10.028en
dc.identifier.issn0267-7261en_NZ
dc.identifier.urihttps://hdl.handle.net/10289/12750
dc.description.abstractTopographic effects, the modification of seismic shaking by irregular topographies compared to flat ground, have been extensively studied. Very few studies, however, have investigated the effects of the stratigraphy and nonlinear response of the underlying geology on topographic amplification. Furthermore, most experimental studies have been performed in the field, where it is often difficult to establish an ideal flat-ground reference station, as well as to characterize the soil properties and their spatial variability in sufficient detail. Dafni [1] recently tested the seismic response of step-like slopes in a series of centrifuge experiments, where the incident motion, reference station and material properties were characterized in detail. In this study, we investigated the influence of the container boundary on topographic effects observed in the centrifuge experiments by performing numerical simulations with and without the container boundary. Our analysis suggested that the rigid-body rocking motion of the centrifuge container likely increased the experimental topographic spectral ratios, contributing to the discrepancy between the simulated and observed spectral ratios. We also found that although the laminar box lateral boundaries caused spurious reflections, they didn’t qualitatively affect the ground surface amplification pattern compared to numerical predictions of the same configuration without boundaries. At the same time, and most importantly, however, we found that the baseplate –by trapping waves scattered and distracted by the slope– amplified the ground motion at the crest up to one order of magnitude compared to numerical predictions of the response in absence of the baseplate. Our results show that topographic effects can be significantly affected by the underlying soil stratigraphy; and allude to the potentially significant role of this phenomenon in elevating seismic risk in regions with strong topographic relief. The findings of this study also suggest that future studies will benefit from clear understanding and careful considerations of capabilities and limitations of different investigation methods and that the numerical modelling and the lab testing (or the field testing) methods should complement each other.
dc.language.isoenen_NZ
dc.publisherElsevieren_NZ
dc.rightsThis is an author’s submitted version of an article published in the journal: Soil Dynamics and Earthquake Engineering © 2019 Elsevier
dc.subjectScience & Technologyen_NZ
dc.subjectTechnologyen_NZ
dc.subjectPhysical Sciencesen_NZ
dc.subjectEngineering, Geologicalen_NZ
dc.subjectGeosciences, Multidisciplinaryen_NZ
dc.subjectEngineeringen_NZ
dc.subjectGeologyen_NZ
dc.subjectTopographyen_NZ
dc.subjectFinite elementsen_NZ
dc.subjectCentrifuge experimentsen_NZ
dc.subjectBoundary effectsen_NZ
dc.subjectAmplificationen_NZ
dc.subjectGROUND-MOTIONen_NZ
dc.subjectSEISMIC RESPONSEen_NZ
dc.subjectWAVE-PROPAGATIONen_NZ
dc.subjectEARTHQUAKEen_NZ
dc.subjectHILLen_NZ
dc.subjectDIFFRACTIONen_NZ
dc.subjectTARZANAen_NZ
dc.subjectEXAMPLEen_NZ
dc.subjectFIELDen_NZ
dc.titleHow topography-dependent are topographic effects? Complementary numerical modeling of centrifuge experimentsen_NZ
dc.typeJournal Article
dc.identifier.doi10.1016/j.soildyn.2018.10.028en_NZ
dc.relation.isPartOfSoil Dynamics and Earthquake Engineeringen_NZ
pubs.begin-page654
pubs.elements-id230299
pubs.end-page667
pubs.publication-statusPublisheden_NZ
pubs.volume116en_NZ
dc.identifier.eissn1879-341Xen_NZ


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