Nonlinear Buckling Analysis of Slender Piles with Geometric Imperfections

Nadeem, Mohammad; Chakraborty, Tanusree; Matsagar, Vasant

doi:10.1061/(asce)gt.1943-5606.0001189

Cited by 33 publications

(11 citation statements)

References 23 publications

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“…Initial imperfections are somewhat unavoidable in piles which may have been caused by fabrication tolerances or mishandling in transportation [37]. Although small, the imperfection cannot be neglected since it is proved to have an influence on pile buckling [38]. Currently, a handful of considerations are…”

Section: Effect Of Pile Imperfection and Soil Heterogeneitymentioning

confidence: 99%

Numerical evaluation of buckling in steel pipe piles during vibratory installation

Bakroon

Daryaei

Aubram

et al. 2019

Soil Dynamics and Earthquake Engineering

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The buckling of steel pipe piles during installation is numerically studied. Generally, numerical simulation of installation processes is challenging due to large soil deformations. However, by using advanced numerical approaches like Multi-Material Arbitrary Lagrangian-Eulerian (MMALE), such difficulties are mitigated. The Mohr-Coulomb and an elastic-perfectly plastic material model is used for the soil and pile respectively. The pile buckling behavior is verified using analytical solutions. Furthermore, the model is validated by an experiment where a pipe pile is driven into sand using vibratory loading. Several case scenarios, including the effects of heterogeneity in the soil and three imperfection modes (ovality, out-of-straightness, flatness) on the pile buckling are investigated. The numerical model agrees well with the experimental measurements. As a conclusion, when buckling starts, the penetration rate of the pile decreases compared to the non-buckled pile since less energy is dedicated to pile penetration given that it is spent mainly on buckling.

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Section: Effect Of Pile Imperfection and Soil Heterogeneitymentioning

confidence: 99%

Numerical evaluation of buckling in steel pipe piles during vibratory installation

Bakroon

Daryaei

Aubram

et al. 2019

Soil Dynamics and Earthquake Engineering

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“…Yan et al [19] used a centrifugal model to study the lateral bearing performance of a wharf supported by defective pile on a slope and used numerical simulation to analyze the failure mode, horizontal behavior, bending displacement and bending moment of defective pile. Nadeem et al [20] regarded the bending of pile as a quality defect. Finite element analysis showed that the greater the bending degree of pile, the more serious the bearing capacity loss and the more obvious the deformation of pile.…”

Section: Introductionmentioning

confidence: 99%

Behavior Investigation of Necking Pile with Caps Assisted with Transparent Soil Technology

et al. 2022

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Pile easily develops necking defects during construction, which can limit the exertion of shaft resistance, resulting in reducing ultimate bearing capacity and creating potential safety hazards to projects. Based on transparent soil technology, this paper took the necking located in the middle part of pile shafts as an example and carried out vertical loading experiments on one intact pile and nine necking piles with caps. Then, the influences of necking length and diameter on the vertical bearing capacity were studied. The speckle field of the soil around piles was processed using the MatPIV program to investigate soil displacement. Through comparison and analysis with the intact pile, the reasons for the reduction in bearing capacity were obtained. The results show that the bearing capacity of the piles is seriously damaged by the necking. When the necking diameter is 4 mm and the necking length is 20 mm, the loss of vertical bearing capacity was 26.6%. The vertical bearing capacity decreases with the increase in necking length or the decrease in necking diameter. Pile necking makes a significant contribution to the displacement of soil around the cap. Inclined downward displacement of soil occurs near necking, which reduces the relative displacement between pile and soil and leads to the loss of pile resistance. For the necking with a large size, the soil displacement at the necking and around the pile cap is connected, which causes the displacement range of the soil under the pile cap to increase, resulting in a weakening of the exertion of shaft resistance. Subsequently, the vertical bearing capacity of piles is reduced.

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“…Bhattacharya and Goda [10] formulated probabilistic method to analyze buckling stability characteristic for axially loaded piles in liquefiable soils and found that boundary condition of the pile was essential to pile buckling stability. Nadeem et al [11] adopted finite element method on the research of nonlinear stability for slender defect piles. e analyses' results showed that the load-carrying capacity of the piles decreased with increasing pile curvature and increasing slenderness ratio of the initially bent piles.…”

Section: Introductionmentioning

confidence: 99%

Buckling Stability Analysis for Piles in the Slope Foundation Based on Cusp Catastrophe Theory

Zhang

Jin

2021

Mathematical Problems in Engineering

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The aim of this paper is to analyze the buckling stability problem for piles in the slope foundation based on cusp catastrophe theory. Formulation of critical buckling load of piles in the slope foundation is obtained. The influential factors of slope angle, distribution of landslide thrust behind the pile, pile-embedded ratio, pile constraints, pile-side friction, pile-side soil resistance, and pile socketed ratio upon buckling stability characteristic for piles in the slope foundation are examined. The results reveal that when pile diameter remains unchanged, critical buckling load increases with the increase of pile length when pile-embedded ratio reaches 60%. When pile length remains unchanged, critical buckling load increases with the increase of pile diameter. Critical buckling load with the assumption of nonlinear horizontal elastic resistance of pile-side soil in the paper is more close to the value based on horizontal elastic resistance of pile-side soil suggested in the code. When slope angle increases, decreased extent of buckling critical load for piles 30–60 m in length is more obvious than the piles which are 10–30 m in length. Strengthening of pile constraints and increase of pile-embedded ratio and socketed ratio are helpful to pile critical buckling load increase. The influential factors of pile-side friction and landslide thrust behind the pile upon pile critical buckling load are tiny and can be neglected.

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Nonlinear Buckling Analysis of Slender Piles with Geometric Imperfections

Cited by 33 publications

References 23 publications

Numerical evaluation of buckling in steel pipe piles during vibratory installation

Numerical evaluation of buckling in steel pipe piles during vibratory installation

Behavior Investigation of Necking Pile with Caps Assisted with Transparent Soil Technology

Buckling Stability Analysis for Piles in the Slope Foundation Based on Cusp Catastrophe Theory

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