Discrete-Element Method Simulations of the Response of Soil-Foundation-Structure Systems to Multidirectional Seismic Motion

Zamani, Natasha; Shamy, Usama El

doi:10.1061/(asce)gm.1943-5622.0000247

Cited by 15 publications

(8 citation statements)

References 33 publications

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“…6a), supporting the assumption made by Schofield & Wroth (1968) that is dissipated entirely by friction. Prior research by Zamani & El Shamy (2013) supports the finding that interparticle frictional sliding is the main source of energy dissipation.…”

Section: Evolution Of Energy During Shearingsupporting

confidence: 54%

“…El Shamy & Denissen (2012) computed the energy dissipated prior to liquefaction in their undrained (constant volume) cyclic loading simulations. Bi et al (2011) and Zamani & El Shamy (2013) also show the evolution of energy dissipation for a biaxial test and various soil-foundation-structure systems, respectively. Sun et al (2011) used granular solid hydrodynamics in conjunction with DEM to investigate elastic energy and energy dissipation during compression of a granular material.…”

Section: Introductionmentioning

confidence: 99%

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Energy dissipation in soil samples during drained triaxial shearing

2018

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The discrete element method was used to simulate drained triaxial compression of large-scale, polydisperse numerical samples at a range of void ratios while tracing all relevant energy components.The frictional dissipation and boundary work are almost equal regardless of sample density. The volumetric work reaches a steady value at large strain. However, the distortional work increases continually as sample deformation continues post-critical state. There is a preferential orientation for frictional dissipation at around 45° to the major principal stress direction. This matches the orientation at which there is the largest number of sliding contacts. The work equations, which are fundamental in most commonly used constitutive models, are linear when plotted against deviatoric strain. The Modified Cam Clay work equation substantially over-predicts the frictional dissipation for dense samples. An alternative, thermodynamically-consistent work equation gives a much better description of frictional dissipation and is therefore recommended to ensure accuracy in modelling.

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Section: Evolution Of Energy During Shearingsupporting

confidence: 54%

Section: Introductionmentioning

confidence: 99%

Energy dissipation in soil samples during drained triaxial shearing

2018

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“…As the next step, the soil response methods can be developed to methods for examining soilbuilding interactions based on a three-component input wave field. This conclusion is basically consistent with the opinions of other studies that investigated vertical ground motions, which were introduced in the Introduction (Button et al 2002;Byrne and Houlsby 2002;Manna and Baidya 2009;Kim et al 2011;Zamani and Shamy 2013). The present study, which uses reasonable input excitation of vertical ground motions based on wave theory, reinforces these opinions.…”

Section: Nonlinear Responsessupporting

confidence: 92%

“…Manna and Baidya (2009) performed an analytical and experimental study on the vertical vibration of full-scale piles. Additionally, Zamani and Shamy (2013) recently simulated the response of soil-foundationstructure systems to multidirectional ground motion, using a discrete element method. These studies showed that the effects of vertical ground motions on various structures were not very distinct.…”

Section: Introductionmentioning

confidence: 99%

Three-Dimensional Nonlinear Soil Response Methods Based on a Three-Component Input Wave Field

Iida

2016

Int. J. Geomech.

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In a previous study, three-dimensional (3D) linear and simplified nonlinear finite-element soil response methods based on a horizontal-component input seismic wave field were proposed. A seismic wave field means seismic waves propagating in a 3D medium. The method had been developed with the goal of adequately treating short-period (less than a few seconds) seismic surface waves trapped by a deep (several km) underground structure in a shallow soil model. In the present study, along with improvements of the methods, 3D linear and simplified nonlinear soil response methods based on a three-component input seismic wave field are developed, and are applied to estimate seismic soil responses in the three geotechnical zones (the reclaimed, alluvial, and hill zones) of Tokyo during two large earthquakes. The more reasonable soil responses revealed that, in a practical sense, vertical ground motions affected soil responses very little. They also clarified large effects of liquefaction in the reclaimed zone and inferred no large ground failure in the alluvial and hill zones.

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“…A follow-up parametric study [20] varied the sample porosity, maximum strain amplitude and cycle frequency while individual energy terms (boundary work, frictional dissipation, damping, strain and kinetic) were tracked. Zamani & El Shamy [21] computed the dissipated energy for a range of soil-foundation-structure systems. Tong & Wang [22] showed the effect of the number of particles, particle aspect ratio and aging (captured by contact creep) on the energy terms per unit volume for cyclic shearing.…”

Section: Introductionmentioning

confidence: 99%

Energy dissipation in soil samples during cyclic triaxial simulations

Keishing

Huang

Hanley

2020

Computers and Geotechnics

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Energy terms were computed in a set of undrained cyclic triaxial discrete-element method simulations which form a parametric study of five factors: void ratio, initial mean effective stress, mean deviator stress, deviator stress amplitude and compressive/extensive initial loading. Void ratio is the only one of these factors which significantly affects the relationship between the excess pore water pressure and the unit energy dissipated (energy dissipated per unit volume). The trends in both the number of complete cycles and the unit energy up to the onset of liquefaction match experimental data. Through analysis of the micro-scale particle and contact information, a preferred contact orientation for frictional dissipation of 30-40° was found. Following a shear reversal, there is a period of negligible frictional dissipation in these simulations of around 0.04% axial strain. This explains, from an energy perspective, why many load cycles are needed to induce liquefaction if their amplitude is very small. A commonly used energy-based model to evaluate the liquefaction potential of a soil was assessed. A substantial improvement in the predictive ability of this model may be achieved by including the mean deviator stress.

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Discrete-Element Method Simulations of the Response of Soil-Foundation-Structure Systems to Multidirectional Seismic Motion

Cited by 15 publications

References 33 publications

Energy dissipation in soil samples during drained triaxial shearing

Energy dissipation in soil samples during drained triaxial shearing

Three-Dimensional Nonlinear Soil Response Methods Based on a Three-Component Input Wave Field

Energy dissipation in soil samples during cyclic triaxial simulations

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