Pile group response to liquefaction-induced lateral spreading: E-Defense large shake table test

Motamed, Ramin; Towhata, Ikuo; Honda, Toshio; Tabata, Kenji; Abe, Akio

doi:10.1016/j.soildyn.2013.04.007

Cited by 87 publications

(23 citation statements)

References 18 publications

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“…Many attempts have been made through laboratory centrifuge tests, [5][6][7][8][9][10][11][12][13] shake-table tests, [14][15][16][17][18][19][20][21][22] and in-situ blast tests. Many attempts have been made through laboratory centrifuge tests, [5][6][7][8][9][10][11][12][13] shake-table tests, [14][15][16][17][18][19][20][21][22] and in-situ blast tests.…”

Section: Introductionmentioning

confidence: 99%

“…Previous experimental studies mainly focus on the seismic behavior of piles and pile-supported structures (e.g., bridges and buildings) in liquefiable soils alone, without considering scour effects. Many attempts have been made through laboratory centrifuge tests, [5][6][7][8][9][10][11][12][13] shake-table tests, [14][15][16][17][18][19][20][21][22] and in-situ blast tests. [23][24][25] Centrifuge tests generally use model-scaled metal piles because reinforced concrete (RC) piles cannot be largely scaled down with RC materials.…”

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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“…As mentioned before, lateral spreading can damage the piles and deep foundations of structures [65][66][67][68][69][70][71][72][73][74][75][76][77][78]. Pile failure under lateral spreading can be due to substantial lateral movement of lique ed soil and associated lateral pressure on the piles, as well as the lateral loads exerted from non-lique able crust layer on upper section of the piles.…”

Section: Lateral Spreadingmentioning

confidence: 99%

The role of geotechnical engineering in sustainable and resilient cities

Haeri

2016

Scientia Iranica

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Geotechnical engineering is a fundamental subject in civil and environmental engineering that engineers are required to refer to when any type of retro tting, design or construction of projects and developments are encountered in a city or in a rural area. Indeed in many projects like geotechnical structures, such as earth dams, geotechnical engineering is the main subject. In this paper, the role of geotechnical engineering in sustainable and resilient cities is elaborated mainly through a series of questions and answers. Also, some related geotechnical engineering research, that is in hands in Civil Engineering Department of Sharif University, is discussed in this paper. A unique geotechnical engineering project that is designed and supervised in the city of Tehran by the author is also introduced herein to indicate how an accurate design and construction of a geotechnical structure can result in a sustainable and resilient condition. However, due to the variety of the subjects involved under the title of the paper, some of the subjects are touched brie y.

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“…It is understood by many scholars [21][22][23][24] that: The experiments and numerical analysis on the dynamic seismic response of a structure could be affected by many factors, namely, site condition, surrounding soil properties, constitutive model, ground motion parameters, and structural form of pile foundation. In karst areas, the bearing capacity of foundation piles is not only controlled by the properties of the karst cave (e.g.…”

Section: Introductionmentioning

confidence: 99%

Shaking Table Tests and Numerical Analysis on the Seismic Response of Karst-Crossing Socketed Piles in Dry Sandy Soil Foundation

Wang¹,

Ding²,

Zhang³

2020

IJDNE

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The foundation piles in karst areas have different mechanical properties from those in other areas. Targeting a critical highway bridge in a karst area, this paper designs two kinds of foundation pile models: friction pile, and KCSP, based on theories on dynamic tests. Then, shaking table tests were carried out to ascertain the features of pile strain distribution of KCSP under earthquakes. During the tests, a large laminar suspended shear box was adopted to mimic the boundary effect of soil. In addition, numerical simulations were conducted to disclose the effects of karst cave on pile strain. The test results indicate that: the peak strain of KCSP increased with the peak acceleration; For both KCSP and friction pile, the peak strain decreased first and then increased along the depth; The presence of karst cave can adversely affect the seismic response of foundation pile; The taller the karst cave, the larger the peak strain of the pile; the peak strain of KCSP was larger at the two ends, and smaller in the middle. The numerical analysis shows that: the peak strain of foundation pile in karst cave increased significantly with cave height; The peak strain of the pile passing through multiple caves was similar to that of the pile passing through only one cave, under the same cave height; But the multi-cave scenario differed from the single-cave scenario in peak strain distribution. The research results provide new insights into the seismic design of pile foundation of bridges in karst areas.

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Pile group response to liquefaction-induced lateral spreading: E-Defense large shake table test

Cited by 87 publications

References 18 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 role of geotechnical engineering in sustainable and resilient cities

Shaking Table Tests and Numerical Analysis on the Seismic Response of Karst-Crossing Socketed Piles in Dry Sandy Soil Foundation

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