Centrifuge Testing of Rocking Foundations on Saturated Sand and Unconnected Piles: The Fluid Response

Allmond, Jacquelyn; Kutter, Bruce L.

doi:10.1061/9780784412121.181

Cited by 15 publications

(5 citation statements)

References 5 publications

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“…Although it is difficult to derive general conclusions, because of the different experimental setups, soil conditions, structural types, and input motions, some common features are worth to be highlighted. First, as illustrated in Table 2, in spite of the high intensity of the earthquake excitation, the normalized residual settlements seldom exceed about 1 %, which only occurs either under "extreme" loading conditions or in the case of liquefiable soils (Allmond et al 2011).…”

Section: Experimental Results Of Seismically Loaded Structures On Non...mentioning

confidence: 99%

The role of non-linear dynamic soil-foundation interaction on the seismic response of structures

Pecker

Paolucci

Chatzigogos

et al. 2013

Bull Earthquake Eng

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In this paper we provide an overview of recent research work that contributes to clarify the effects of non-linear dynamic interaction on the seismic response of soil-foundation-superstructure systems. Such work includes experimental results of seismically loaded structures on shallow foundations, theoretical advancements based on improved macro-element modeling of the soil-foundation system, examples of seismic design of bridge piers considering non-linear soil-foundation interaction effects, and numerical results of incremental non-linear dynamic analyses. The objective of this paper is to support the concept of a controlled share of ductility demand between the superstructure and the foundation as a key ingredient for a rational and integrated approach to seismic design of foundations and structures

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Section: Experimental Results Of Seismically Loaded Structures On Non...mentioning

confidence: 99%

The role of non-linear dynamic soil-foundation interaction on the seismic response of structures

Pecker

Paolucci

Chatzigogos

et al. 2013

Bull Earthquake Eng

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“…The simplified liquefaction-triggering procedures of Idriss and Boulanger (2008) and others typically use the input as the maximum ground surface acceleration (PGA) that would have occurred if the site did not liquefy (Allmond 2012;Olson et al 2020). Since the ground surface acceleration measured in the centrifuge tests was affected by the liquefaction, the use of the measured motion is not, in general, the appropriate input for the liquefaction evaluation in the experiment.…”

Section: Analysis Using Proposed Design Proceduresmentioning

confidence: 99%

Displacement-Based Design of Axially Loaded Piles for Seismic Loading and Liquefaction-Induced Downdrag

Sinha

Ziotopoulou

Kutter

2023

J. Geotech. Geoenviron. Eng.

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Axially loaded piles in liquefiable soils can undergo severe settlements due to a shaking event. During shaking, the settlement is caused by the reduction of its shaft and tip capacity from the excess pore pressures generated around the pile. Post shaking, additional pile settlement is caused by the surrounding soil settling due to reconsolidation and the associated development of drag load. A new displacementbased method is developed using a TzQzLiq analysis for designing axially loaded piles subject to seismic loading and liquefaction-induced downdrag. The new displacement-based design method offers several advancements to the state of practice forced-based design procedure by AASHTO's force-based design procedure by reasonably accounting for the mechanisms that occur on axially loaded piles during and post shaking. It accounts for the initial drag load on the pile, redistribution effects resulting in large excess pore pressures in the non-liquefied layers, and reduction in the pile's shaft and tip capacity from excess pore pressures around the pile. The new design procedure estimates the pile settlement and axial load distribution during the entire shaking event, i.e., during shaking and reconsolidation. Design steps are provided describing the procedure for obtaining design curves on the settlement and drag load on piles with varying pile lengths. The length of the piles is then selected based on serviceability criteria and the pile's structural strength. Finally, the new design procedure is applied on piles used in centrifuge model tests, and results are compared, followed by an example design problem that illustrates the applicability of the new method in practice.

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“…The shallow foundation tests performed by Dashti et al (2010a, b) explored various sized mat foundations over a layer of liquefiable sand to evaluate liquefaction induced building settlement mechanisms. Allmond and Kutter (2012, 2013) performed experiments to evaluate viability of rocking foundations in saturated and submerged conditions, including liquefiable soils. Lastly, the tests by Zupan et al (2013) and Hayden et al (2014) investigated the structure-soil-structure interaction (SSSI) of adjacent structures, such as those found in a typical city block.…”

Section: Current Test Series In the Databasementioning

confidence: 99%

New Database for Foundation and Ground Performance in Liquefaction Experiments

et al. 2015

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Physical modeling of buildings founded on layers of liquefiable sand has produced insightful data describing ground and building performance. A new publicly available NEEShub database, “FLIQ,” summarizes data from 9 large-scale centrifuge tests with 4 different lead experimentalists, various soil profiles, 49 stations of site and structure response, and more than 60 shaking events, that is, 405 events in total. Example correlations between ground-motion intensity measures and performance measures are presented to illustrate the usefulness of the database. The relationship between PGA at the surface and base is highly variable when liquefaction is observed; however, the relationship between the cumulative absolute velocity ( CAV) at the surface and base is relatively linear, even when liquefaction occurs. Additionally, the CAV was found to correlate well with settlement and can account for settlement history. Contrary to intuition, foundation settlement in liquefied soil is not directly correlated to bearing pressure; larger bearing pressures can decrease liquefaction occurrence and related settlements. The database has potential to grow through future community input.

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Centrifuge Testing of Rocking Foundations on Saturated Sand and Unconnected Piles: The Fluid Response

Cited by 15 publications

References 5 publications

The role of non-linear dynamic soil-foundation interaction on the seismic response of structures

The role of non-linear dynamic soil-foundation interaction on the seismic response of structures

Displacement-Based Design of Axially Loaded Piles for Seismic Loading and Liquefaction-Induced Downdrag

New Database for Foundation and Ground Performance in Liquefaction Experiments

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