Finite element modeling of soil-pile response subjected to liquefaction-induced lateral spreading in a large-scale shake table experiment

Li, Gangjin; Motamed, Ramin

doi:10.1016/j.soildyn.2016.11.001

Cited by 45 publications

(16 citation statements)

References 16 publications

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“…Structural models in centrifuge tests practically remained elastic; thereby inelastic damage patterns of widely used RC pile structures are not well documented. 1 Except for tests, major numerical studies fell into the estimates of pile behavior in liquefiable soils (e.g.,, [26][27][28][29] among others), while rare studies focused on the seismic behavior of bridges in liquefiable soils. So far, only three such tests, each in US, 23 Japan 24 and Italy, 25 have been performed on piles without supported structures.…”

Section: Introductionmentioning

confidence: 99%

“…It should be noted that most of these shake-table tests concentrated on kinematic effects on the failure mechanism, while neglecting superstructure-induced inertial forces that have been proved to be an important source for bridge failures in liquefied soils. 1 Except for tests, major numerical studies fell into the estimates of pile behavior in liquefiable soils (e.g.,, [26][27][28][29] among others), while rare studies focused on the seismic behavior of bridges in liquefiable soils. [30][31][32] To date, due to inherent complexities of soilstructure interaction and liquefaction, studies on seismic failure mechanism of bridges in liquefied soils are still warranted.…”

Section: Introductionmentioning

confidence: 99%

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Shake‐table investigation of scoured RC pile‐group‐supported bridges in liquefiable and nonliquefiable soils

Wang

Shang

2019

Earthq Engng Struct Dyn

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Summary This paper presents results of one‐g shake‐table tests on scoured pile‐group‐supported bridge models in saturated (liquefiable) and dry (nonliquefiable) sands. The primary objective is to reveal the influence of liquefaction on seismic demands and failure mechanism of scoured bridges. To this end, two identical models, each consisting of a 2 × 2 reinforced concrete pile‐group with a center‐to‐center spacing of 3 times pile diameter, a cap and a single pier with a lumped iron block, were constructed and embedded into saturated and dry sands, respectively, with the same scour depth of 4 times pile diameter. Typical test results, including excess pore pressure, acceleration and displacement demands are interpreted first, followed by the focus on curvature demands and associated seismic failure mechanism identification. Finally, inertial and kinematic effects on pile curvature demands are estimated using cross‐correlation analyses. Results show that near‐pile liquefied soils exhibit more remarkable dilation tendency as compared to far field. For bridges under the given scour depth, soil liquefaction tends to significantly affect the failure modes via transferring damage positions from pier bottom to pile head and meanwhile from underground pile to pile head. In addition, pile group effects appear to be significant in nonliquefiable soils while to be relatively inessential in liquefied soils. Moreover, the inertial effect is more prominent in nonliquefiable soils, while the kinematic effect itself generally appears to be more significant in liquefiable soils. The test results can be used to validate numerical models for future studies.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Shake‐table investigation of scoured RC pile‐group‐supported bridges in liquefiable and nonliquefiable soils

Wang

Shang

2019

Earthq Engng Struct Dyn

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“…Therefore, while the aim of the work presented in this section is to review and provide well-interpreted field of the dynamic response of piles by different physical model tests that can be used to evaluate analytical procedures and design methods. Many studies have investigated the seismic response of pile, soil and superstructure using shake-table experiments [58][59][60][61][62][63], dynamic centrifuge experiments [19,64,65], and full-scale field tests that utilise blast-induced liquefaction [66,67]. The requirements for a model container for carrying out seismic soil-structure interactions (SSI) at 1-g (shaking table) and N-g (geotechnical centrifuge at N times earth's gravity) are well introduced in [68].…”

Section: Laboratory Testingmentioning

confidence: 99%

The Dynamic Behaviour of Pile Foundations in Seismically Liquefiable Soils: Failure Mechanisms, Analysis, Re-Qualification

Rostami¹,

Hytiris²,

Bhattacharya³

2021

Earthquakes - From Tectonics to Buildings

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This chapter presents a concise overview of the mechanics of failure, analysis and requalification procedures of pile foundations in liquefiable soils during earthquakes. The aim is to build a strong conceptual and technical interpretation in order to gain insight into the mechanisms governing the failure of structures in liquefaction and specify effective requalification techniques. In this regard, several most common failure mechanisms of piles during seismic liquefaction such as bending (flexural), buckling instability and dynamic failure of the pile are introduced. Furthermore, the dynamic response commentary is provided by critically reviewing experimental investigations carried out using a shaking table and centrifuge modelling procedures. The emphasis is placed on delineating the concept of seismic design loads and important aspects of the dynamic behaviour of piles in liquefiable soils. In this context, using Winkler foundation approach with the proposed p–y curves and finite-element analyses in conjunction with numerical analysis methods, are outlined. Moreover, the feasibility of successful remediation techniques for earthquake resistance is briefly reviewed in light of the pile behaviour and failure. Finally, practical recommendations for achieving enhanced resistance of the seismic response of pile foundation in liquefiable soil are provided.

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“…Samui et al [11] analyzed the lateral buckling of pile groups caused by the axial loads on pile foundation under the condition of soil liquefaction around the pile. Li and Motamed [12] established a two-dimensional nonlinear dynamic finite element model, studied the interaction of pilesoil system under the consideration of two-dimensional effective stress, and compared the analysis results of finite element model and test results. Wang et al [13,14] conducted a series of shaking table test and found that sand liquefaction will cause the foundation acceleration response to change and the maximum bending moment of the pile appears in the pile head position during the vibration process.…”

Section: Introductionmentioning

confidence: 99%

Research on Lateral Force of Pile Based on Liquefaction Site Effect

Zuo

Enquan

2020

Shock and Vibration

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This paper presents a theoretical investigation on the lateral force of pile in liquefaction site. Regarded liquefied soil as fluid, the vector method can be used to analyze the liquefaction velocity field and solve the analytical solution of the dynamic field by making use of the principle of fluid mechanics. In addition, by solving the velocity field with vector symbol operation method, the analytical expression of the lateral force in the liquefied flow field is obtained, and the sensitivity of the parameters in the analytical expression is analyzed. The results show that the stress field of the pile contains both the pressure resistance caused by surface pressure and the friction resistance caused by shear stress, when the liquefied soil flows laterally. The lateral forces on the pile are mainly composed of inertial forces and damping forces and are related to density, fluid viscosity, pile radius, and vibration frequency. With the increase of density, fluid viscosity, and pile radius, the added mass and added damping increase gradually. In a certain range, added mass and added damping are sensitive to vibration frequency.

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Finite element modeling of soil-pile response subjected to liquefaction-induced lateral spreading in a large-scale shake table experiment

Cited by 45 publications

References 16 publications

Shake‐table investigation of scoured RC pile‐group‐supported bridges in liquefiable and nonliquefiable soils

Shake‐table investigation of scoured RC pile‐group‐supported bridges in liquefiable and nonliquefiable soils

The Dynamic Behaviour of Pile Foundations in Seismically Liquefiable Soils: Failure Mechanisms, Analysis, Re-Qualification

Research on Lateral Force of Pile Based on Liquefaction Site Effect

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