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Seismic settlements of shallow foundations: a sliding block approach

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

Original languageEnglish
Title of host publicationRecent Advances in Earthquake Engineering in Europe
Subtitle of host publicationProceedings of the 16th European Conference on Earthquake Engineering (16ECEE)
Publisher or commissioning bodyEuropean Association for Earthquake Engineering (EAEE)
ISBN (Electronic)9783319757414
ISBN (Print)9783319757407
DateAccepted/In press - 27 Feb 2018
DatePublished (current) - 22 Jun 2018
Event16th European Conference on Earthquake Engineering: Thessaloniki - 2018 - Thessaloniki, Greece
Duration: 18 Jun 201821 Jun 2018
Conference number: 16
http://www.16ecee.org/

Conference

Conference16th European Conference on Earthquake Engineering
Abbreviated title16ECEE
CountryGreece
CityThessaloniki
Period18/06/1821/06/18
Internet address

Abstract

Allowing the seismic bearing capacity of shallow foundations to be momentarily exceeded during extreme earthquake events can function as a mechanism of natural seismic isolation that is beneficial for the superstructure. However, this effect comes at the price of accumulating foundation settlements, which also need to be accounted for in the performance-based design process. Although the seismic bearing capacity of footings can be estimated with reasonable accuracy, there is still no widely approved methodology to calculate the associated seismic settlements. This paper attempts to address this issue through an extension of Newmark’s sliding block analysis, where the footing is modeled as a rigid block on a horizontal surface, with the block-base friction being a function of the critical seismic acceleration to trigger bearing capacity failure. When the block is subjected to an earthquake excitation and the frictional resistance is exceeded, an accumulating vertical displacement is also calculated, proportional to the amount of horizontal sliding. In the case of symmetric motions, this occurs twice per cycle and vertical settlements accumulate even when the residual horizontal displacement is zero. For quick applications, a semi-analytical factor is derived, correlating the settlements predicted by the proposed model to the residual horizontal displacements of a conventional rigid block sliding on an inclined plane, under the same input motion and with the same critical acceleration. This factor can be used in combination with well-established empirical relations for seismic displacements of slopes and retaining walls, thus extending their applicability to cover the response of shallow foundations.

    Research areas

  • shallow foundations; seismic settlements; sliding block; performance-based design

Event

16th European Conference on Earthquake Engineering: Thessaloniki - 2018

Abbreviated title16ECEE
Conference number16
Duration18 Jun 201821 Jun 2018
CityThessaloniki
CountryGreece
Web address (URL)
Degree of recognitionInternational event

Event: Conference

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Documents

  • Full-text PDF (accepted author manuscript)

    Rights statement: This is the accepted author manuscript (AAM). The final published version (version of record) is available online via EAEE. Please refer to any applicable terms of use of the publisher.

    Accepted author manuscript, 1 MB, PDF document

    Licence: Unspecified

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