Capacity Change of Piles in Loess under Cyclic Axial Tension or Compression Load

Li, Zhe; Zhao, Jinpeng; Liu, Tong; Guan, Chenhui; Long, Yi; Zhu, Wuwei; Liu, Lulu

doi:10.1061/ijgnai.gmeng-8742

Cited by 6 publications

(2 citation statements)

References 29 publications

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“…Piles that support the offshore jacked/tripod structures are exposed to combined axial (uplift and compression) and lateral forces (Figure 1). However, helical piles are superior to conventional pile foundations [6][7][8] because they provide more resistance due to the helix [9,10]. Despite the abundance of usage areas of helical piles, the increase in application, and the advantages they provide, it can be seen that research and design methods for helica piles are relatively limited compared to conventional pile foundations, and previou studies mostly focus on the uplift behavior [11][12][13][14][15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Physical and Finite Element Models for Determining the Capacity and Failure Mechanism of Helical Piles Placed in Weak Soil

Emirler

2024

Applied Sciences

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The foundations of particular engineering structures, including marine and jetty structures, mooring systems for submerged platforms or those on the ocean surface, and transmission towers, are subjected to various external loads including compression, uplift, and lateral loads. In such cases, to improve the soil resistance below foundations, pile foundations such as helical piles, anchored piles, and batter piles are commonly preferred, depending on the in situ conditions. Helical piles, increasingly used as an alternative foundation to conventional piles, are placed in the soil body by rotating with torque. This paper deals with the contribution of a helical pile in improving loose sandy soil, and the main purpose is to study the effect of the helix-buried depth on the load-bearing capacity and failure mechanism. The investigated variables include the distance between helixes, the number of helixes, and the diameter of the upper helix. Physical model tests were conducted, and two- and three-dimensional numerical analyses were performed by using the finite element method with an advanced soil model to illustrate the failure mechanisms of helical piles. The aim was to reveal the efficiency of the finite element method in modelling helical piles placed in weak sandy soil. A simplified linear geometry for helixes was established in a two-dimensional finite element model whereas a real geometry for helixes, which was a more realistic approach, was created in a three-dimensional finite element model. The results show that the three-dimensional model indicates better agreement with the physical model compared to the two-dimensional model, and all investigated variables highly affect the load-bearing capacity of helical piles.

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Section: Introductionmentioning

confidence: 99%

Physical and Finite Element Models for Determining the Capacity and Failure Mechanism of Helical Piles Placed in Weak Soil

Emirler

2024

Applied Sciences

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“…This assessment will be based on a three-dimensional finite element refined model that has been validated against on-site test results. Moreover, this paper proposes a straightforward and pragmatic calculation method grounded in current standards, ultimately providing theoretical support for the practical application of composite-anchor uplift piles in engineering projects [21,22]. The composite-anchor cable structure incorporated within the pile enables the adaptability of the composite-anchor pile to diverse working conditions, rendering it a promising solution to revolutionize the current utilization of uplift piles.…”

Section: Introductionmentioning

confidence: 99%

Finite Element Analysis of Load-Bearing Characteristics and Design Method for New Composite-Anchor Uplift Piles

Jiang,

Mao,

Chen

et al. 2024

Applied Sciences

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This paper introduces a new type of uplift pile known as the composite-anchor pile, which employs a composite anchor composed of steel strands, grouting materials, and steel pipes as the main reinforcement. This paper extensively analyzes this pile’s load-bearing capacity and deformation characteristics through full-scale field tests and three-dimensional finite element numerical simulations. The results show that the composite-anchor pile has a more even distribution of stress, and its endurance and mechanics performance are better than others. Furthermore, this study utilizes a three-dimensional finite element refined model that has been validated using on-site test results to examine the influence of key parameters, such as the pile diameter, the number of composite-anchor cables, and the diameter of steel strands, on the load-bearing capacity of uplift piles. Building upon these findings, this paper introduces a calculating method to determine the bearing capacity of composite-anchor piles, thereby addressing the existing gap in this field.

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Investigation of new confined concrete-filled aluminum tube piles: Experimental and numerical approaches

Al-Darraji,

Sadique,

Alahmari

et al. 2024

Results in Engineering

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Capacity Change of Piles in Loess under Cyclic Axial Tension or Compression Load

Cited by 6 publications

References 29 publications

Physical and Finite Element Models for Determining the Capacity and Failure Mechanism of Helical Piles Placed in Weak Soil

Physical and Finite Element Models for Determining the Capacity and Failure Mechanism of Helical Piles Placed in Weak Soil

Finite Element Analysis of Load-Bearing Characteristics and Design Method for New Composite-Anchor Uplift Piles

Investigation of new confined concrete-filled aluminum tube piles: Experimental and numerical approaches

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