Use of Ricker motions as an alternative to pushover testing

Marianna Loli, Jonathan Adam Knappett, Ioannis Anastasopoulos, Michael John Brown

    Research output: Contribution to journalArticle

    3 Citations (Scopus)
    113 Downloads (Pure)

    Abstract

    When undertaking centrifuge studies on seismic soil–structure interaction, it is useful to be able to define the pseudo-static ‘pushover’ response of the structure. Normally, this requires separate centrifuge experiments with horizontal actuators. This paper describes an alternative procedure, using Ricker ground motions to obtain the pushover response, thereby allowing both this and the response to seismic shaking to be determined using a centrifuge-mounted shaker. The paper presents an application of this technique to a 1:50 scale model bridge pier with two different shallow foundations, as part of a study on seismic protection using rocking isolation. The moment–rotation (‘backbone’) behaviour of the footings was accurately determined in the centrifuge to large rotations, as verified through independent three-dimensional dynamic non-linear finite-element modelling. Ricker wavelet ground motions are therefore shown to be a useful tool for the identification of pushover response without requiring additional actuators. Furthermore, a simplified analytical methodology is developed, which allows one to predict the maximum foundation rotation induced by a specific Ricker pulse. This methodology may be useful in predicting the characteristics (frequency and acceleration magnitude) of the Ricker pulse required to describe the pushover response of any (practically) rigid oscillator supported on shallow foundations.
    Original languageEnglish
    Pages (from-to)44-55
    Number of pages12
    JournalInternational Journal of Physical Modelling in Geotechnics
    Volume15
    Issue number1
    Early online date26 Feb 2015
    DOIs
    Publication statusPublished - Mar 2015

    Fingerprint

    Centrifuges
    centrifuge
    Testing
    ground motion
    Actuators
    static response
    Bridge piers
    methodology
    footing
    pier
    wavelet
    modeling
    experiment
    Experiments

    Cite this

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    abstract = "When undertaking centrifuge studies on seismic soil–structure interaction, it is useful to be able to define the pseudo-static ‘pushover’ response of the structure. Normally, this requires separate centrifuge experiments with horizontal actuators. This paper describes an alternative procedure, using Ricker ground motions to obtain the pushover response, thereby allowing both this and the response to seismic shaking to be determined using a centrifuge-mounted shaker. The paper presents an application of this technique to a 1:50 scale model bridge pier with two different shallow foundations, as part of a study on seismic protection using rocking isolation. The moment–rotation (‘backbone’) behaviour of the footings was accurately determined in the centrifuge to large rotations, as verified through independent three-dimensional dynamic non-linear finite-element modelling. Ricker wavelet ground motions are therefore shown to be a useful tool for the identification of pushover response without requiring additional actuators. Furthermore, a simplified analytical methodology is developed, which allows one to predict the maximum foundation rotation induced by a specific Ricker pulse. This methodology may be useful in predicting the characteristics (frequency and acceleration magnitude) of the Ricker pulse required to describe the pushover response of any (practically) rigid oscillator supported on shallow foundations.",
    author = "Marianna Loli and Knappett, {Jonathan Adam} and Ioannis Anastasopoulos and Brown, {Michael John}",
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    Use of Ricker motions as an alternative to pushover testing. / Loli, Marianna; Knappett, Jonathan Adam; Anastasopoulos, Ioannis; Brown, Michael John.

    In: International Journal of Physical Modelling in Geotechnics, Vol. 15, No. 1, 03.2015, p. 44-55.

    Research output: Contribution to journalArticle

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