Centrifuge modeling of batter pile foundations under earthquake excitation

Li, Zheng; Escoffier, Sandra; Kotronis, Panagiotis

doi:10.1016/j.soildyn.2016.05.013

Cited by 45 publications

(21 citation statements)

References 30 publications

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“…Escoffier et al performed centrifuge tests on inclined and vertical pile groups using static cyclic loadings and confirmed the higher horizontal stiffness provided by the inclined pile group. This was also observed by Li and Li et al from dynamic sinusoidal and seismic centrifuge test results. The authors stated that in certain cases, batter piles play a beneficial role on the seismic behavior of the pile foundation system and that their performance depends not only on the characteristics of the earthquakes (frequency content and amplitude) but also on the type of superstructures they support.…”

Section: Introductionsupporting

confidence: 84%

A hypoplastic macroelement formulation for single batter piles in sand

Kotronis

Escoffier³

et al. 2018

Num Anal Meth Geomechanics

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Summary Batter piles are widely used in geotechnical engineering when substantial lateral resistance is needed or to avoid the interference with existing underground constructions. Nevertheless, there is a lack of fast numerical tools for nonlinear soil‐structure interactions problems for this type of foundation. A novel hypoplastic macroelement is proposed, able to reproduce the nonlinear response of a single batter pile in sand under monotonic and cyclic static loadings. The behavior of batter piles (15°, 30°, and 45°) is first numerically investigated using 3D finite element modeling and compared with the behavior of vertical piles. It is shown that their response mainly depends on the pile inclination and the loading direction. Then, starting from the macroelement for single vertical piles in sand by Li et al (Acta Geotechnica, 11(2):373‐390, 2016), an extension is proposed to take into account the pile inclination introducing simple analytical equations in the expression describing the failure surface. 3D finite element numerical models are adopted to validate the macroelement that is proven able to reproduce the nonlinear behavior in terms of global quantities (forces‐displacements) and to significantly reduce the necessary computational time.

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Section: Introductionsupporting

confidence: 84%

A hypoplastic macroelement formulation for single batter piles in sand

Kotronis

Escoffier³

et al. 2018

Num Anal Meth Geomechanics

Self Cite

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“…Nonnegligible residual bending moments in the case of seismic input, and significant local non-linearities around the pile head when the inclined piles where loaded from the top, where found in experimental studies by Escoffier [9] and Goit and Saitoh [25], respectively. In this respect, more comparison studies between numerical results and existing [8,9,10] or new experimental data, should be performed.…”

Section: Discussionmentioning

confidence: 99%

“…Even though the use of inclined piles might seem to be detrimental in seismic areas in terms of their kinematic internal forces around the pile heads, there exist both numerical [2,1,7] and experimental [10] results that suggest that their use could be beneficial in many cases when looking at the total (kinematic plus inertial). This fact could be related to the role played by the rotational kinematic interaction response of the foundation observed here.…”

Section: Discussionmentioning

confidence: 99%

“…Several numerical [2,3,4,5,6,1,7] and experimental [8,9,10] studies have already looked into the seismic response of raked piles reaching very interesting conclusions for several particular cases. These results seem to confirm that inclined piles might develop kinematic forces at the pile-cap connection larger than those observed in their vertical counterparts, but they also suggest that batter piles might be beneficial in terms of the total response.…”

Section: Introductionmentioning

confidence: 99%

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Kinematic internal forces in deep foundations with inclined piles

Padrón

Suárez

Aznárez

et al. 2015

Earthq Engng Struct Dyn

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This paper presents a parametric study that looks into the influence of pile rake angle on the kinematic internal forces of deep foundations with inclined piles. Envelopes of maximum kinematic bending moments, shear forces and axial loads are presented along single inclined piles and 2 × 2 symmetrical square pile groups with inclined elements subjected to an earthquake generated by vertically-incident shear waves. Inclination angles from 0 to 30 are considered, and three different pile-soil stiffness ratios are studied. Amplification factors for the kinematic bending moments with respect to the vertical configuration are also presented. These results are obtained through a frequency-domain analysis using a boundary element -finite element code in which the soil is modelled by the boundary element method as a homogeneous, viscoelastic, unbounded region, and the piles are modelled by finite elements as Euler-Bernouilli beams. The rotational kinematic response of the pile foundations is shown to be a key factor on the evolution of the kinematic internal forces along the foundations.

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“…They confirmed that the performance of the batter piles degraded when the applied sinusoidal wave was in the region of the structure's natural period, and improved when the structure's natural period was in the region of that of the soil. Similarly, Li et al [13] analyzed the behavior of batter piles relative to the size of the structures by applying earthquake excitation. The batter piles had positive effects on the structure in terms of displacement and force and, overall, showed positive performance, especially in short structures.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Behavior of Pile-Supported Structures with Batter Piles according to the Ground Slope through Centrifuge Model Tests

Yun

Han

2020

Applied Sciences

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Pile-supported structures incorporating batter piles are commonly used, and can be installed both on the horizontal and inclined ground. Recent studies have considered the positive role of batter piles during earthquakes, highlighting their satisfactory contribution to structural seismic performance. However, in these structures, even though the dynamic system responses can vary greatly depending on the ground slope, few previous studies have evaluated the seismic performance of batter piles relative to the ground slope. Therefore, this study evaluates the seismic performance of pile-supported structures with batter piles, relative to the ground slope using dynamic centrifuge model tests. The acceleration, displacement, moment, and axial force of the system were experimentally derived and reviewed, and the pile moment and axial force (M–N) interaction diagrams of the pile cross-sections were analyzed. The installation of the batter piles resulted in a greater reduction in the system response in the inclined-ground model (acceleration: −48%, displacement: −50%, and moment: −84%) compared to that in the horizontal-ground model (acceleration: −27%, displacement: +650%, and moment: −77%). Overall, batter piles showed better seismic performance in the inclined-ground model than in the horizontal-ground model.

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Centrifuge modeling of batter pile foundations under earthquake excitation

Abstract: International audienc

Cited by 45 publications

References 30 publications

A hypoplastic macroelement formulation for single batter piles in sand

A hypoplastic macroelement formulation for single batter piles in sand

Kinematic internal forces in deep foundations with inclined piles

Dynamic Behavior of Pile-Supported Structures with Batter Piles according to the Ground Slope through Centrifuge Model Tests

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