Dynamic response of vertically loaded helical and driven steel piles

ElkasabgyMohamed,; Hesham, El NaggarM.

doi:10.1139/cgj-2011-0126

Cited by 67 publications

(10 citation statements)

References 23 publications

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“…The boundary zone parameters of the weakened zone are adjusted based on the literature (Elkasabgy and El Naggar 2013;Han and Novak 1988;Manna and Baidya 2009;Vaziri and Han 1992) so that theoretical response curves approach towards dynamic test curves. However, there is no specific guideline available in the literature to estimate the actual value of nonlinear parameters for different levels of eccentric moment with depth and soil conditions.…”

Section: Boundary Zone Parametersmentioning

confidence: 99%

Nonlinear Characteristics of Floating Piles Under Rotating Machine Induced Vertical Vibration

2015

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This study presents a finite element based approach to evaluate the linear and nonlinear frequency-amplitude response of floating piles subject to rotating machine induced vertical vibrations. A Matlab program is developed to compute the response of a single pile with floating tip condition for a linear and two nonlinear soil models. The variation of complex soil stiffness parameters with frequency has also been presented using different boundary zone parameters (shear modulus reduction ratio, thickness ratio and damping ratio). A detailed investigation of soil-pile system stiffness and damping parameters has been done considering different values of soil-pile separation lengths and boundary zone parameters. To verify the effectiveness of this proposed approach vertical vibration tests were conducted in the field on a single pile of diameter 0.114 m and length of 2.85 m by constructing floating tip condition. The frequencyamplitude response obtained from field vibration test has been compared with the theoretical results for all the soil models. From the comparison results it is observed that the proposed theory can predict the nonlinear response of floating piles very efficiently with proper inclusion of boundary zone parameters and soil-pile separation lengths.

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Section: Boundary Zone Parametersmentioning

confidence: 99%

Nonlinear Characteristics of Floating Piles Under Rotating Machine Induced Vertical Vibration

2015

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“…Similar types of experiments were done by Burr et al (1997) on various small-scale soil-pile setups in varying soil layers to study the influence of soil-pile spacing to diameter ratio on the nonlinear response of piles. Further, these dynamic results are studied under harmonic vibration and analytically with the use of the continuum approach method by Elkasabgy and El Naggar (2013) and Sinha et al (2015) to know the effect on soil nonlinearity subjected to dynamic excitation and the combined soil-pile responses in terms of frequency and amplitude and their influence on impedance parameters. Some other researchers (Elkasabgy and Naggar 2018;Biswas and Manna 2018;Ralli et al 2022;Kumar et al 2022) also worked in this area and did experimental field and laboratory tests on different setups and compared their datasets with the theoretical curves measured from the continuum approach.…”

Section: Introductionmentioning

confidence: 99%

Machine Induced Dynamic Field Responses of Group Pile with Different Pile Arrangements

Kumar

Choudhary

Burman

2023

Preprint

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The main objective of the current investigation is to study the dynamic behaviour of a 3-pile group with two different arrangements of pile setups under coupled (horizontal and rocking) excitations. To accomplish this objective, machine-induced field excitation tests are conducted on small-scale hollow steel piles. The 3-pile group is driven into the ground in a triangular arrangement with 3d spacing. Two different soil-pile setups, i.e., Pile Group-I and Pile Group-II, are created based on dynamic force directions. In the case of Pile Group-I, the forces are applied to the direction of the median of the triangle, and for Pile Group-II, the forces are applied to other directional loads. From the test results, it is found that the resonant peaks of horizontal and rocking amplitudes for Pile Group-I are lower than Pile Group-II. In the case of resonant frequencies, the values of Pile Group-I are observed to be the same or a little bit higher as compared to Pile Group-II. It is found that the dynamic soil-pile-soil interaction effect is more prominent for Pile Group-II than for Pile Group-I. For numerical investigation, the continuum approach method is utilised with the inclusion of a dynamic group interaction factor to predict the dynamic coupled responses in terms of frequency and amplitude for these two soil-pile setups. To understand the behaviour of pile groups, boundary zone parameters and variations of impedance parameters (stiffness and damping) with operating frequencies are also measured using this theoretical approach.

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“…Several analytical models have been proposed to discuss the longitudinal dynamic characteristics of soil-pile interaction system [7][8][9]. The Winkler model has been widely used due to its convenience, in which the soil is simplified into a series of spring-dashpot elements [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

A new approach for longitudinal vibration of a large-diameter floating pipe pile in visco-elastic soil considering the three-dimensional wave effects

Meng

Cui

Liang

et al. 2020

Computers and Geotechnics

158

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A novel approach is presented to describe the dynamic interaction system of a large-diameter floating pipe pile and surrounding soils, taking the three-dimensional wave effects into account. The corresponding analytical solutions for longitudinal complex impedance are obtained and subsequently validated via comparisons with existing solutions. Comparative analyses are also performed to illustrate the difference between the present and previous solutions, concerning the wave propagation effect in the radial direction on the longitudinal dynamic vibration of pile shaft. Furthermore, the effects of Poisson's ratio and visco-elastic support beneath the pile toe, on the longitudinal dynamic vibration of pile shaft, are investigated. It is indicated that the presented approach and corresponding solutions provide a more wideranging application for longitudinal vibration analysis of a largediameter floating pipe pile, which can also be reduced to analyze the longitudinal vibration problems of large-diameter floating solid pile and fixed-end pipe pile.

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Dynamic response of vertically loaded helical and driven steel piles

Cited by 67 publications

References 23 publications

Nonlinear Characteristics of Floating Piles Under Rotating Machine Induced Vertical Vibration

Nonlinear Characteristics of Floating Piles Under Rotating Machine Induced Vertical Vibration

Machine Induced Dynamic Field Responses of Group Pile with Different Pile Arrangements

A new approach for longitudinal vibration of a large-diameter floating pipe pile in visco-elastic soil considering the three-dimensional wave effects

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