Centrifuge modelling of the effects of soil liquefiability on seismic response of low-rise structures

Shengwenjun Qi (Lead / Corresponding author), Jonathan Knappett

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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Abstract

Earthquake-induced soil liquefaction can generate significant damage to low-rise structures, as evidenced in the 2010-2011 Canterbury Earthquake Sequence in New Zealand. In this paper, the structural response of low-rise structures on medium dense granular soils of different permeability (but both nominally liquefiable) was investigated using dynamic centrifuge modelling. In the tests, a series of consecutive motions from the 2010-2011Canterbury Earthquake Sequence was considered, followed by a long duration ‘double-pulse’ mo-tion from the 2011 Tohoku Earthquake which can potentially apply large inertial loads after liquefaction has been triggered. It was observed that the lower permeability test reached full liquefaction at shallow depth dur-ing shaking, while soil of higher permeability was only comparable in response in the first earthquake; in sub-sequent strong aftershocks excess pore water pressures were substantially reduced. The structural response of higher permeability soil was 10-45% larger due to the increased motion transmission ability of the soil after the initial earthquake. The structure on the higher permeability soil did, however, show reduced post-earthquake tilt in all motions tested. These results suggest that popular liquefaction triggering analyses may be limited in their ability to properly estimate the hazard posed to structures on nominally liquefiable soil when estimating resistance to subsequent motions (aftershocks).
Original languageEnglish
Title of host publicationPhysical Modelling in Geotechnics
Subtitle of host publicationProceedings of the 9th International Conference on Physical Modelling in Geotechnics (ICPMG 2018), July 17-20, 2018, London, United Kingdom
EditorsAndrew McNamara, Sam Divall, Richard Goodey, Neil Taylor, Sarah Stallebrass, Jingasha Panchal
Place of PublicationLondon
PublisherCRC Press
Pages1011-1016
Number of pages6
Volume2
Edition1
ISBN (Electronic)9780429797620
ISBN (Print)9781138344228
DOIs
Publication statusPublished - 24 Oct 2018
Event9th International Conference on Physical Modelling in Geoetchnics - City University, London, United Kingdom
Duration: 17 Jul 201820 Jul 2018

Conference

Conference9th International Conference on Physical Modelling in Geoetchnics
CountryUnited Kingdom
CityLondon
Period17/07/1820/07/18

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