Experimental investigation of plastic demands in piles embedded in multi-layered liquefiable soils

Chang, Barbara; Hutchinson, Tara C.

doi:10.1016/j.soildyn.2013.01.012

Cited by 26 publications

(12 citation statements)

References 17 publications

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“…The test specimens and concrete cubes and prims were constructed together. 20,34,48,49 Section analyses are performed using the OpenSees-based modeling technique of Zero-length-section element with fiber section, in which the longitudinal rebars are modeled using Steel02 material 45 while the concrete fibers are assigned using Concrete04 material that can represents the Mander model.…”

Section: Reinforcements and Section Moment-curvature Analysesmentioning

confidence: 99%

“…It is worth noting that using momentcurvature-analyses-derived first-yielding curvatures to identify failure processes of RC structures in experiments has been adopted in a number of former investigations. 20,34,48,49…”

Section: Reinforcements and Section Moment-curvature Analysesmentioning

confidence: 99%

“…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: Reinforcements and Section Moment-curvature Analysesmentioning

confidence: 99%

Section: Reinforcements and Section Moment-curvature Analysesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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“…In the past, many tests have studied the SSI effects and seismic behavior of pile-supported piers with a concentrated oscillation mass or even neglecting an oscillation mass in different soils (Makris et al 1997, Yao et al 2004, Rollins et al 2005, Tokimatsu et al 2005, Cubrinovski et al 2006, Dungca et al 2006, Chau et al 2009, Motamed and Towhata 2010, Gao et al 2011, Haeri et al 2012, Chang and Hutchinson 2013, Motamed et al 2013, Goit and Saitoh 2014, Durante et al 2015, Wang et al 2015, Durante et al 2016, Su et al 2016, Durante et al 2017, Liu et al 2017, Wang et al 2019). The research work validated experimentally the Winkler foundation model using the displacement transfer function and strain spectrum of a SDOF superstructure supported by a single pile (Makris et al 1997).…”

Section: Introductionmentioning

confidence: 99%

Evaluation on influences of inertial mass on seismic responses and structure-soil interactions of pile-soil-piers

Xie

Sun

2021

Bull Earthquake Eng

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This research is to assess the influences of the inertial mass from the girder on the dynamic characteristic, dynamic response, and structure-soil interaction of a pile-soil-pier subsystem in a scale-model of a cable-stayed bridge. Therefore, both connection configurations between the pile-soil-pier and girder, including the sliding and fixed connections, were designed to present various inertial mass from the superstructure delivered to the pile-soilpier. The pile-soil-pier supported by a 3×3 pile-group in mixed soil placed in a shear box was tested using shaking tables. The dynamic characteristics, seismic responses, inertial interactions, and pile group effects of the pile-soilpier between the sliding and fixed connections were analyzed under three input motions with different shaking amplitudes. These results showed that more inertial mass from the girder significantly increased the reinforcement strain and bending moment at the column bottom and pile top, displacement at the column top, inertial interaction effects, and pile group effects of the pile-soil-pier due to the sliding connection changing to the fixed connection.The inertial mass increment from the girder noticeably decreased the peak accelerations of the column of the pilesoil-pier when subjected to three input motions with different amplitudes. However, the inertial mass insignificantly affected the accelerations of the pile and free-soil. Therefore, the corresponding kinematic interaction effects were almost unaffected by the inertial mass. Additionally, the evident pile group effects were observed in the sliding and 2 fixed connections between the pile-soil-pier and girder. The numerical model could approximately reproduce the macroscopic seismic responses of the pile-soil-piers with sliding and fixed connections and capture the typical response variations induced by the connection configuration change.

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Inertial and kinematic interactions of bridge‐pile group subjected to liquefaction induced lateral spreading: Large‐scale shaking table experiments

Jia

Naggar

et al. 2023

Earthq Engng Struct Dyn

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This paper investigates the seismic bridge‐pile‐soil system failure mechanisms due to liquefaction‐induced lateral spreading. Two large‐scale shaking table tests were performed on pile groups with and without bridges in sloped liquefiable soils overlain by soil crust. The systems were subjected to a weak earthquake signal (Tabas 0.05 g) and a strong earthquake signal (Tabas 0.3 g). Their responses were recorded in terms of excess pore pressure, acceleration, and displacement time histories. The piles seismic failure mode and mechanism are described based on the obtained results. In addition, the inertial and kinematic interaction effects on the piles’ deflection were evaluated. The results demonstrated that the bridge had no significant effect on the seismic response of the pile‐soil system under weak earthquakes. Meanwhile, the test model without a bridge experienced more significant soil lateral displacement, and the saturated sand exhibited dilatant behavior, and amplified the acceleration peak response during the strong earthquake. Moreover, the liquefaction‐induced lateral spreading moved the vulnerable position of the pile group bridge system from the pier bottom to the pile head, which changed the failure mode of the pile head. The results also revealed that, compared with weak earthquake excitation, the kinematic effect was significantly enhanced, and the inertia effect was weakened during strong earthquakes. Moreover, the pile curvature during both weak and strong earthquakes was inversely proportional to the bridge inertial load.

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Experimental investigation of plastic demands in piles embedded in multi-layered liquefiable soils

Cited by 26 publications

References 17 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

Evaluation on influences of inertial mass on seismic responses and structure-soil interactions of pile-soil-piers

Inertial and kinematic interactions of bridge‐pile group subjected to liquefaction induced lateral spreading: Large‐scale shaking table experiments

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