Finite element analysis of helical piles subjected to axial impact loading

Alwalan, Mohammed; Naggar, M. Hesham El

doi:10.1016/j.compgeo.2020.103597

Cited by 38 publications

(7 citation statements)

References 22 publications

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“…The model's horizontal limit was considered 1.5 times the total length of the pile, while the lower limit was set at a depth of 2.5 times the total length of the pile (1.5 L * 2.5 L). These values are greater than the minimums (L * 2 L) recommended by Alwalan and El Naggar [16]. The lateral boundaries allow vertical displacements and restrict horizontal displacements and rotations, while the lower boundary restricts all displacements and rotations.…”

Section: Model Developmentmentioning

confidence: 69%

“…The PLAXIS 2D finite element software was used to model the piles, which makes it possible to perform stress deformation analysis and predict the behavior of piles subjected to static and dynamic axial loads [16,23].…”

Section: Model Developmentmentioning

confidence: 99%

“…Alwalan and Naggar [16] propose a finite element analysis for helical piles subjected to high-deformation dynamic tests using PLAXIS; in this study, the influence of the number of helical plates was determined, as well as the spacing between helical plates, the weight of the hammer, and the drop height in the static capacity of helical piles.…”

Section: Introductionmentioning

confidence: 99%

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Parametric Study of Helical Piles Subjected to Compression and Tension Loading Through Finite Element Analysis: A Case Study

Gil-Hernandez,

Ibarra-Penagos,

Triviño-Oviedo

2024

Indian Geotech J

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This study performed a parametric analysis on helical piles through finite element models. To carry out this study, the modeling of two case studies was carried out in the PLAXIS 2D software; the results of the models were compared with the results of experimental investigations of helical piles subjected to compression and tension. The calibrated models were used to carry out the parametric study in which the spacing between plates, the number of helical plates, and the diameter of the plates were modified. The results suggest that a spacing ratio s/D < 3 is not convenient since it generates a cylindrical shear failure, decreasing the capacity of the pile; furthermore, utilizing more than three plates in helical piles does not result in a substantial increase in pile capacity, while increasing the diameter of the helical plates provides a larger supporting surface, directly enhancing the pile's capacity.

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Section: Model Developmentmentioning

confidence: 69%

Section: Model Developmentmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Parametric Study of Helical Piles Subjected to Compression and Tension Loading Through Finite Element Analysis: A Case Study

Gil-Hernandez,

Ibarra-Penagos,

Triviño-Oviedo

2024

Indian Geotech J

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“…To accurately simulate the response of the soil to static and dynamic impact loading developed by static and dynamic load testing, the model dimensions must be located far enough away from the studied pile to eliminate boundary effects. The recommended model size (L × 2L), according to their studies [27,[34][35][36][37], should be used for optimal accuracy and calculating efficiency. Moreover, the model geometry is evaluated by changing the position of the vertical and horizontal boundaries until the calculated responses converge to a constant value at the pile head.…”

Section: Model Geometry and Boundary Conditionsmentioning

confidence: 99%

Numerical Investigation of Large-Diameter Bored Piles under High-Strain Dynamic Testing: A Case Study in New Alamein City

Salem,

El-Saei,

Krajníková

et al. 2024

Buildings

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Large-diameter bored piles can safely transmit loads from structures by skin friction to the surrounding soil strata and end bearing at the bedrock layer, thereby providing a high compressive capacity. High-Strain Dynamic Testing (HSDT) provides a unique alternative technique to traditional Static Load Testing (SLT) for determining the static compressive resistance of the bored piles, considering its quicker performance and significant cost reductions. This article’s main objective is to numerically explore the performance of large-diameter bored piles during the HSDT and to understand their dynamic behavior under an axial compressive impact force. This research is based on testing pile foundations for reinforced concrete mixed-use towers in the coastal zone of New Alamein City, Egypt. The tested pile is a 1.20 m diameter bored pile. Numerical modeling is performed to simulate both the HSDT and the SLT for two piles at the same site. Non-linear axisymmetric finite element modeling is employed to validate both test records and develop some sort of matching between the two tests. As lumped models, the developed numerical models use the signal-matching process, which is conducted by varying and adopting the strength parameters and deformation characteristics of the ground or soil deposit and the soil–pile interface. The predicted load-displacement curves, developed from analyzing dynamic records employing the Modified Unloading Point (MUP) method, are consistent with the field records. The verified non-linear models are utilized to accomplish a comparative parametric analysis to better understand the drop-mass system aspects. The analysis results emphasize the significance of employing adequate impact energy (i.e., dropping height and mass) to move the pile top to a sufficient extent to mobilize its full resistance. However, a longer impact duration, i.e., larger mass, is more effective for achieving a deeper high-strain wave. The impact load should be developed by a larger drop mass with a lower drop height, not a smaller drop mass with a higher drop height. The results also indicate that, for relatively longer piles, the skin friction of the upper layers surrounding the pile shaft is fully mobilized, whereas the skin resistance of the lower layers is not fully mobilized, regarding the stress wave phenomenon effect. Finally, this study’s findings can be employed to develop guidelines and design procedures for the HSDT to be effectively performed on bored piles.

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“…This resistance reduced the impact of cyclic loading by reducing the amplitude of settlement of soil but with less effect than the case of several helices. Alwalan and Naggar [12] reported that the spacing ratio does not influence an HSDT (High Strain Dynamic Test) in a statistically meaningful manner.…”

Section: Effect Of Helical Spacing Using Hardening Soil Modelmentioning

confidence: 99%

The Performance of Helical Pile under Cyclic Load Using 3D-Finite Element Analysis

shakir¹,

Salim²,

Baqir³

2022

ETJ

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 As a final result, increasing the number of helices in a pile has a greater effect on reducing displacement amplitude than increasing the distances between the helixes.Helical piles are a kind of foundation that can withstand compression, tension, and lateral stresses. However, this kind of pile was utilized extensively globally for almost 25 years. Its behavior, particularly in Iraq, is uncertain and frightening. The current research used the finite element technique to analyze this kind of pile. The helical pile geometry was suggested to be modeled using the finite element method using the computer software Plaxis 3D The soil used is medium sandy soil. Additionally, parametric analyses were conducted. The primary parametric research examines the impact of helix number, helix spacing, helix diameter, and helix configuration under cyclic load. The main results are more helices in a pile, the lower the amplitude of settlement (in the direction of z) compared to a pile without helices. As a result, the amplitude of settlement in the case of two helices decreased by 81.6 %, while the amplitude of settlement in the case of three-helix decreased by 77.74 %. In the case of three helices, the higher spacing between the helices, the lower the value of the amplitude of settlement (in the direction of z). The effect of the number of helices in the hardening soil model is more than the effect of the number of helices in the Mohr-Coulomb. As a final result, increasing the number of helices in a pile has a more significant effect in reducing the amplitude of settlement than increasing the between the helices.

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Finite element analysis of helical piles subjected to axial impact loading

Cited by 38 publications

References 22 publications

Parametric Study of Helical Piles Subjected to Compression and Tension Loading Through Finite Element Analysis: A Case Study

Parametric Study of Helical Piles Subjected to Compression and Tension Loading Through Finite Element Analysis: A Case Study

Numerical Investigation of Large-Diameter Bored Piles under High-Strain Dynamic Testing: A Case Study in New Alamein City

The Performance of Helical Pile under Cyclic Load Using 3D-Finite Element Analysis

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