Estimation of design axial stiffness of reinforcing piles in vertical extension remodelling process using numerical computation

Jeong, Sangseom; Kim, Do-Hyun

doi:10.1016/j.engstruct.2020.110623

Cited by 4 publications

(3 citation statements)

References 9 publications

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“…The underpinning performance in terms of load sharing capacity of a pile in a pile-group is affected by its axial stiffness (Randolph 1983, Poulos 2001, Fleming et al 2009. Therefore, the axial stiffnesses of existing piles and underpinning piles are essential factors for determining the load sharing behavior between existing piles and MPs in underpinned foundations (Makarchain and Poulos 1996, Leung et al 2011, Jeong and Kim 2020. Based on small-scale experiments, found that the load sharing capacity of a pile increased with its stiffness capacity.…”

Section: Introductionmentioning

confidence: 99%

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A field study on the load sharing behavior of a micropiled raft underpinned by a waveform micropile

2022

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A waveform microiple(WMP) uses jet grouting method to generate shear keys along the pile shaft for improving the shaft resistance and cost efficiency. In this study,field loading tests were performed in this study to characterize the load sharing behavior upon inclusion of a waveform micropile (WMP) in a group of four micropiled-raft. First, single-pile compressive loading tests were conducted on three WMPs and five Type A micropiles (MP). Subsequently, a group-pile loading test was performed on a piled raft comprising 2 × 2 MPs and a central WMP. The load–settlements, axial stiffnesses, and load transfer mechanisms of individual MPs were analyzed during the tests, including the short- and long-term effects of the axial stiffnesses of the MPs on the load sharing ratio of the micropiled-raft. The single-pile loading test results revealed that the shear keys along the WMPs caused its bearing capacities and axial stiffnesses to be 1.5 times and 2–5 times higher than those of MPs, respectively. In the micropiled-raft loading test, the load sharing ratios of the MPs increased with their axial stiffnesses, and the highest load sharing capacity was exhibited by the WMP, which constituted 30% of the total load and 2–3 times that of MPs. Moreover, the influence of raft on the load-sharing capacity should be considered as well.

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Section: Introductionmentioning

confidence: 99%

“…Kim et al (2019) estimated the axial stiffness of an underpinning pile and its influence on the load carrying capacity via numerical analysis. Jeong and Kim (2020) proposed an axial stiffness range to achieve an optimal underpinning design, considering the deterioration of the existing piles.…”

Section: Introductionmentioning

confidence: 99%

A field study on the load sharing behavior of a micropiled raft underpinned by a waveform micropile

2022

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“…Wu et al [2][3][4] theoretically investigated the response of an extended defective pile shaft-supporting superstructure. Kim et al [5,6] obtained the required axial stiffness of reinforcing pile in vertical extension remodeling to strengthen the existing defective piles with the 3D FEM. Neto et al [7] reported the load capacity of bored piles with a structural defect in a deep foundation through both experimental and numerical approaches.…”

Section: Introductionmentioning

confidence: 99%

Design and Performance of Concrete Pile Strengthened with Lengthened Steel-Tube Core: Model Tests and Numerical Simulations

Han

Lei

2021

Mathematical Problems in Engineering

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In order to solve the problem of insufficient bearing capacity of existing concrete piles, a type of concrete pile with an additional lengthened strengthening core is designed, by inserting the steel tube through guiding hole and pouring core concrete. To reveal the mechanical performance of the reinforced piles, scale model tests and finite element simulations were performed. The results showed that both the vertical and horizontal bearing capacity increase with the length of the stiffening core. The axial force of the enhanced core is also smaller than conventional concrete piles, and the extended core can share the axial force of the foundation pile to improve the stress distribution of the pile body. These findings point toward a useful and general method for increasing the load capacity of existing concrete piles.

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An approximate numerical analysis of rafts and piled-rafts foundation

Jeong,

Park,

Chang

2024

Computers and Geotechnics

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Estimation of design axial stiffness of reinforcing piles in vertical extension remodelling process using numerical computation

Cited by 4 publications

References 9 publications

A field study on the load sharing behavior of a micropiled raft underpinned by a waveform micropile

A field study on the load sharing behavior of a micropiled raft underpinned by a waveform micropile

Design and Performance of Concrete Pile Strengthened with Lengthened Steel-Tube Core: Model Tests and Numerical Simulations

An approximate numerical analysis of rafts and piled-rafts foundation

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