Piles Subjected to Torsional Cyclic Load: Numerical Analysis

Nimbalkar, Sanjay; Punetha, Piyush; Basack, Sudip

doi:10.3389/fbuil.2019.00024

Cited by 8 publications

(4 citation statements)

References 26 publications

(37 reference statements)

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“…Nimbalkar et al [13] developed a numerical model based on the boundary element approach to investigate the performance of a monopile subjected to torsional cyclic loading.…”

Section: Literature Reviewmentioning

confidence: 99%

Effect of Turbine Weight on the Seismic Response of a Wind Turbine‐Monopile System Located in Liquefied Multilayer Soil

Tirandazian

2021

Shock and Vibration

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The core objectives of sustainable development are to develop access to renewable, sustainable, reliable, and cost-effective resources. Wind is an essential source of renewable energy, and monopile wind turbines are one method proposed for harnessing wind power. Offshore wind turbines can be vulnerable to earthquakes and liquefaction. This numerical study defined the effects of wind turbine weight on the seismic response of a wind turbine-monopile system located in liquefied multilayered soil with layer thicknesses of 5, 10, 15, and 20 m using four far-field records. OpenSees PL analysis indicated that if the liquefied sand had a lower density or a thickness of more than 10 m, then an increase in the earthquake acceleration beyond 0.4 g caused the pile to float like liquefied soil and to lose its vertical bearing capacity. Moreover, increasing the wind turbine power from 2 to 5 kW had no significant effect on the soil-structure interaction response. As the earthquake acceleration increased, the bending moment of the pile-column also increased as long as liquefaction did not occur and the pile-column deformation remained rotational-spatial in shape. As the acceleration and liquefaction increased and the pile began to float in response to its transverse motion, there was no significant difference in the pile-column displacement along the length, but there was a decrease in the pile-column bending moments. As this phenomenon increased and the pile continued to float, transformation of the pile increased the difference between the displacement of the pile-column along its length and further increased the bending moments. These results were derived from multiple correlation analysis, the bending moment relations, and lateral displacement of the pile-column of the wind turbine.

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“…Nimbalkar et al [13] developed a numerical model based on the boundary element approach to investigate the performance of a monopile subjected to torsional cyclic loading.…”

Section: Literature Reviewmentioning

confidence: 99%

Effect of Turbine Weight on the Seismic Response of a Wind Turbine‐Monopile System Located in Liquefied Multilayer Soil

Tirandazian

2021

Shock and Vibration

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“…Several standardized design procedures are available; for instance, the API design rules [15] or, in France, the recommendations of the so-called Fascicule 62 [16]. Many studies have been focused on the fatigue effect of lateral cyclic loads of pile foundations generated by winds [17], tides, or water waves [18] in advanced civil engineering structures [1,13,[19][20][21] or subjected to torsion loads [22][23][24][25]. Basack et al [22] studied the pile degradation factor with an increasing number of cycles and proposed a 2D finite element model.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Flexural–Torsional Performance of Thin-Walled Open-Ended Steel Vertical Pile Foundations Subjected to Lateral Loads

et al. 2023

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This research investigates the effects of torsional moments on the mechanical behavior of thin-walled open-ended vertical pile foundations subjected to lateral wind loads. The aim of this research is to determine and quantify the errors using traditional design methods and provide more effective alternatives. The warping and torsion effect generated over the piles due to the resultant lateral load impact outside the shear center is analyzed in field tests. Complementarily, a two-dimensional finite element model based on the simple bending stress–strain state, as well as a three-dimensional finite element model considering torsional effects, were implemented and their results analyzed. Finally, a comparative analysis between the in-field lateral loading tests and the finite element model approaches was established by comparing load–displacement curves and using a non-linear Wrinkle model of the soil. Additionally, correlations between the experimental and finite element model errors for the cross-sections pile with a different torsional constant and torsional susceptibility index are shown. From the results, it has been ascertained that the slender thin-walled open-ended pile foundations are particularly sensitive to small load deviations from their center of gravity; this leads to the fact that the slenderer the load and the greater its eccentricity, the more it affects the torsion and warping of the pile. Calculation methodologies usually consider a simple in-plane bending behavior, which leads to errors between 44 and 58% in comparison with the experimental results obtained.

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“…Several standardized design procedures are available, for instance, the API design rules [13] or in France, the recommendations of the so-called Fascicule 62 [14]. Many studies have been focused on the fatigue effect of lateral cyclic loads of pile foundations generated by winds [15], tides, or water waves [16] in advanced civil engineering structures [1,9,12,17,18] or subjected to torsion loads [19][20][21][22]. Basack et al [19] studied the pile degradation factor with increasing number of cycles and proposed a 2D finite element model.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Flexural-Torsional Performance of Thin-Walled Open-Ended Steel Vertical Pile Foundations Subjected to Lateral Loads

Pérez¹,

Rodríguez²,

Sánchez‐González³

et al. 2023

Preprint

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This research investigates the effects of torsional moments on the mechanical behavior of thin-walled open-ended vertical pile foundations subjected to lateral wind loads. The warping and torsion effect generated over the piles due to the resultant lateral load impact outside the shear center is analyzed in-field tests. Complementarily, a two-dimensional finite element model based on the simple bending stress-strain state as well as a three-dimensional finite element model considering torsional effects were implemented and their results analyzed. Finally, a comparative analysis between the in-field lateral loading tests and the finite element model approaches was established and correlations between the errors and the parameters of influence were highlighted. From the results, it has been ascertained that the slender thin-walled open-ended pile foundations are particularly sensitive to small load deviations from their center of gravity, this leads to the fact that the slenderer and the more eccentricity of the load, the more it affects the torsion and warping of the pile. Calculation methodologies usually consider a simple in-plane bending behavior which conducts to errors between 44 and 58% of the experimental results.

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Piles Subjected to Torsional Cyclic Load: Numerical Analysis

Cited by 8 publications

References 26 publications

Effect of Turbine Weight on the Seismic Response of a Wind Turbine‐Monopile System Located in Liquefied Multilayer Soil

Effect of Turbine Weight on the Seismic Response of a Wind Turbine‐Monopile System Located in Liquefied Multilayer Soil

Experimental and Numerical Flexural–Torsional Performance of Thin-Walled Open-Ended Steel Vertical Pile Foundations Subjected to Lateral Loads

Experimental and Numerical Flexural-Torsional Performance of Thin-Walled Open-Ended Steel Vertical Pile Foundations Subjected to Lateral Loads

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