Experimental trends from lateral cyclic tests of piles in sand

Truong, Pauline; Lehane, Barry

doi:10.1201/b18442-103

Cited by 6 publications

(3 citation statements)

References 2 publications

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“…Long & Vanneste (1994) collated existing field test data from 34 studies and concluded, in general, that pile head movements were dependent on the nature of applied cyclic loads, the sand relative density (D r ) and the pile installation method. The subsequent systematic experimental investigations of Rosquoet et al (2007), and Truong & Lehane (2015) show that the accumulation coefficient (α y ) depends primarily on the cyclic load ratio ( c ) and to a lesser extent the cyclic magnitude ratio ( b ), and varies from a negative value for two-way loading ( c = -1) to between about 0.05 and 0.2 at  c values in the range of -0.5 to 0.75 (noting  c = 0 corresponds to one-way loading with H min = 0). LeBlanc et al (2010) and Albiker et al (2017) present formulations based on 1-g small scale tests in which the accumulation coefficient is considered independent of sand relative density, although scale issues associated with the very low stress level prevalent in these tests need to be acknowledged.…”

Section: Introductionmentioning

confidence: 95%

“…Uniform cyclic loading causes a progressive accumulation of permanent pile rotation (and pile head displacement), with the additional rotation developed in each cycle reducing as the number of cycles (N) increases. Although accumulated rotation is often considered to vary with the logarithm of the number of cycles (Long & Vanneste, 1994), lateral pile experiments described by LeBlanc et al (2010), , Truong & Lehane (2015) and Li et al (2015), show that, for a given level and type of cycling, the ratio of rotation accumulated after N cycles ( N ) to the maximum (positive) rotation reached in the first cycle ( 1 ) is best represented for rigid piles as a power function of N i.e.…”

Section: Introductionmentioning

confidence: 99%

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Empirical approach based on centrifuge testing for cyclic deformations of laterally loaded piles in sand

et al. 2019

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A systematic study into the response of monopiles to lateral cyclic loading in medium dense and dense sand was performed in beam and drum centrifuge tests. The centrifuge tests were carried out at different cyclic load and magnitude ratios, while the cyclic load sequence was also varied. The instrumentation on the piles provides fresh insights into the ongoing development of net stresses, bending moments and deflections as cycling progresses. Parallels between the test results and corresponding cyclic triaxial tests are drawn. The paper combines the results from this study with those from previous experimental investigations to provide empirical design recommendations for monopiles subjected to unidirectional cyclic loading.

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Section: Introductionmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Empirical approach based on centrifuge testing for cyclic deformations of laterally loaded piles in sand

et al. 2019

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“…Estimation of bearing capacity of these piles requires account for not only the interaction between the pipe pile and the outer soil, but also the interplay with the inner soil. [1][2][3][4][5][6][7] The soil layer inside the pipe pile usually does not conform to the displacement of soil outside the pile in pile penetration,…”

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confidence: 99%

Feasibility of bare fiber Bragg grating sensing technology in the measurement of inner wall axial stress along open‐ended pipe pile in sand

Kou

Jing

Zhou

et al. 2021

Structural Contr & Hlth

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Larger-diameter open-ended pipe piles are widely used as foundation for offshore structures. The lack of high-quality inner wall axial stress measurement results in difficulties in loading analysis of open-ended pipe piles during penetration and service period due to the effect of soil plugging. In this paper, two groups of model tests to assess the feasibility of bare fiber Bragg grating (FBG) sensing technology in monitoring the inner wall axial stress profile of open-ended aluminous pipe piles during penetration and horizontal loading are presented. One open-ended aluminous pipe pile was instrumented with bare FBG sensors and then penetrated into the sand bed with the rate of 20 and 30 mm/min, respectively. Two horizontal static loading tests were also conducted after 24-h penetration. The installation process of bare FBG sensors along open-ended aluminous pipe pile is introduced. The distribution profiles of axial stress and unit shaft resistance on inner wall and outer wall along model pile is discussed in detail. Model test results indicated that the bare FBG sensing technology was feasible to measure the axial stress of inner wall along open-ended pipe piles during penetration and horizontal loading in sand. During horizontal loading, the average values of q so /q si are 0.717 and 0.727, respectively, for model pile with penetration rate of 20 and 30 mm/min. The axial stress difference of inner wall and outer wall along model pile in penetration and horizontal loading is the result of a combination of the inside and outside soil friction as well as of the pipe in-wall shear stiffness. K E Y W O R D S bare FBG sensing technology, inner wall axial stress, open-ended pipe pile, outer wall axial stress, sand bed | INTRODUCTIONLarge-diameter pipe piles (Figure 1) are often used for the foundation in offshore engineering, due to their capacity to transfer loads of superstructures to competent soil layers. Estimation of bearing capacity of these piles requires account for not only the interaction between the pipe pile and the outer soil, but also the interplay with the inner soil. [1][2][3][4][5][6][7] The soil layer inside the pipe pile usually does not conform to the displacement of soil outside the pile in pile penetration,

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An experimental study on the parameters affecting the cyclic lateral response of monopiles for offshore wind turbines in sand

Frick

Achmus

2020

Soils and Foundations

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Experimental trends from lateral cyclic tests of piles in sand

Cited by 6 publications

References 2 publications

Empirical approach based on centrifuge testing for cyclic deformations of laterally loaded piles in sand

Empirical approach based on centrifuge testing for cyclic deformations of laterally loaded piles in sand

Feasibility of bare fiber Bragg grating sensing technology in the measurement of inner wall axial stress along open‐ended pipe pile in sand

An experimental study on the parameters affecting the cyclic lateral response of monopiles for offshore wind turbines in sand

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