Generalized cyclic p–y curve modeling for analysis of laterally loaded piles

Heidari, Mehdi; Naggar, Hesham El; Jahanandish, M.; Ghahramani, A.

doi:10.1016/j.soildyn.2014.04.001

Cited by 56 publications

(18 citation statements)

References 27 publications

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“…In the SM model proposed by Norris's group [13,14], the lateral deformation of pile is assumed to vary linearly with depth, and the rotation angle of pile δ is consistent along pile shaft (see Figure 2(a)). However, the actual rotation angle of the lower part of pile should be less than the assumed one, which would lead to a discrepancy with the actual conditions [15,16].…”

Section: Modifications Of Sm Modelmentioning

confidence: 88%

“…Subsequently, Ashour et al [14] extended Norris's method to deal with layered soil in the strain wedge. However, the used stress-strain relation in Norris's method was developed based on limited experiment data and difficult to be applied in the analysis of pile under cyclic lateral loads [15]. Besides, the assumption of linear displacement of piles in SW model would cause some contradictions with the actual bearing behavior of piles [16].…”

Section: Introductionmentioning

confidence: 99%

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A Simplified Method for Analysis of Laterally Loaded Piles considering Cyclic Soil Degradation

Yang

Gao

et al. 2021

Advances in Civil Engineering

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This paper proposes a simplified method to analyze the bearing behavior of pile undergoing cyclic lateral load. Firstly, a modified strain model is proposed by utilizing the Duncan–Chang model to describe the stress-strain behavior of soils in the strain wedge. Then, a cyclic degradation model of soft clay considering the accumulation of plastic strain and pore water pressure is presented based on the cyclic triaxial test. Combining with the modified strain wedge model and degradation model of soil, a simplified method is established for the cyclic laterally loaded pile. The accuracy of the present method is verified by comparing it with existing model tests. The results show that the pile lateral displacement and strain wedge depth increase with the number of cycles and cyclic load amplitude. It is necessary to consider the effect of cumulative pore water pressure during the analysis of cyclic laterally loaded pile embedded in soft clay.

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Section: Modifications Of Sm Modelmentioning

confidence: 88%

Section: Introductionmentioning

confidence: 99%

A Simplified Method for Analysis of Laterally Loaded Piles considering Cyclic Soil Degradation

Yang

Gao

et al. 2021

Advances in Civil Engineering

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“…New design approaches for cyclic lateral loaded piles are derived from the modification and enhancement of the models used to analyse the behaviour of piles subjected to a static load (Achmus et al 2009, Dührkop 2009, Heidari et al 2014. A practical design approach for the prediction of pile displacements due to irregular cyclic lateral loads which can be calibrated by means of static and cyclic triaxial test results is presented in Tașan (2012).…”

Section: Introductionmentioning

confidence: 99%

Serbest Ve Ri̇ji̇t Başli Açik Deni̇z Teki̇l Kazik Temelleri̇ni̇n Tekrarli Yatay Yükler Etki̇si̇ Altindaki̇ Davranişi

Taşan¹

2017

Uludağ University Journal of the Faculty of Engineering

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Offshore piles are subjected to cyclic lateral loads due to environmental loads, such as wind and waves. These loads can lead to an accumulation of permanent soil deformations and excess pore water pressures in saturated soils. Finite element analyses are performed to investigate the behaviour of cyclic laterally loaded free-head and fixed piles embedded in sandy saturated soil while considering such accumulation effects. A three-dimensional fully coupled two-phase finite element is developed and implemented on the basis of a two-phase model to consider the pore water pressure development in saturated soil. In addition, a hypoplastic constitutive model is used to describe the material behaviour of sandy soil under cyclic loading. In the numerical analyses, special attention is dedicated to interactions between the pile, the saturated soil and the pore water. The results have shown that the pile displacements caused by cyclic lateral loads are significantly underestimated for both pile head conditions by approaches which do not take into account the impact of the pore water pressure development in saturated sandy soil of the pile response.Keywords: Offshore piles, cyclic lateral loading, finite element method, fixed-head pile, free-head pile, sandy soil, accumulation, permanent displacement, pore water pressure, two-phase model Serbest ve Rijit Başlı Açık Deniz Tekil Kazık Temellerinin Tekrarlı Yatay Yükler Etkisi Altındaki DavranışıÖz: Açık deniz tekil kazık temelleri rüzgar ve dalga kaynaklı ağır tekrarlı yatay yüklere maruz kalmaktadır. Bu yükler nedeniyle kalıcı zemin deplasmanları ve suya doygun zeminde aşırı boşluk suyu basıncı birikimi gerçekleşebilmektedir. Çalışmada serbest ve rijit başlı tekil kazık temellerinin tekrarlı yatay yükler altındaki davranışı sonlu elemanlar yöntemi ile zeminde aşırı boşluk suyu basıncı gelişimi ve deplasman birikimi dikkate alınarak incelenmiştir. Üç boyutlu sonlu elemanlar analizlerinde, zeminde aşırı boşluk suyu basıncı gelişiminin belirlenmesi amacıyla iki fazlı modele dayanan üç boyutlu elemanlar geliştirilmiştir. Böylelikle kazığın çevresindeki zeminde boşluk suyu basıncı gelişiminin elde edilmesi mümkün olmuştur. Kumlu zemin, tekrarlı yükler altındaki davranışının modellenmesine uygun olan bir hipoplastik malzeme modeli ile tanımlanmıştır. Nümerik analizlerde özellikle kazık, suya doygun zemin ve boşluk suyu basıncı etkileşimi üzerine odaklanmıştır. Analiz sonuçları, tekrarlı yatay yük etkisindeki serbest ve rijit başlı kazıkların deplasmanlarının tahmininde, suya doygun zeminde aşırı boşluk suyu basıncı gelişimini dikkate almayan mevcut modellerin yetersiz kaldığı göstermiştir.Anahtar Kelimeler: Tekil kazık, açık deniz, tekrarlı yatay yükleme, sonlu elemanlar yöntemi, serbest başlı tekil kazık, rijit başlı tekil kazık, kumlu zemin, kalıcı deformasyon, aşırı boşluk suyu basıncı

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“…In addition, Some semi-theoretically derived p-y curve models (Trochanis et al 1991;Badoni and Makris 1996;Gazetas 2005a, 2005b) based on Bouc-Wen degrading hysteretic model (Bouc 1971;Wen 1976) were successively proposed to describe cyclic p-y relationships of pile and soil with consideration to loss of strength. Heidari et al(2013Heidari et al( , 2014) extended Allotey et al's model (Allotey and El Naggar 2008) by generating p-y curves based on the strain wedge method (SWM) (Ashour et al 1998), which can take account of the basic pile and soil properties, such as pile cross-section shape, pile head condition, effective unit weight and undrained shear strength. Boulanger et al (1999) 4 developed a dynamic p-y curve model that can take account of the nonlinear soil behavior, gap formation in cohesive soils, drag force, and soil damping, but this model cannot consider the degradation of the ultimate lateral capacity.…”

Section: Introductionmentioning

confidence: 99%

Development of cyclicp–ycurves for laterally loaded pile based on T-bar penetration tests in clay

Wang

Liu

2016

Can. Geotech. J.

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Offshore pile foundations are always subjected to cyclic lateral loads, which can result in the remolding and softening of the surrounding seabed soil. Cyclic T-bar penetrometer testing provides a rapid and effective method for assessing the remolded shear strength. It is widely believed that the soil strength degrades with the accumulation of plastic strain, but the strain cannot be measured. Numerical analysis of this paper shows that the accumulated plastic displacement of T-bar in a cyclic range of two diameters is approximately equal to its accumulated displacement. By using T-bar test data, a cyclic degradation model based on the accumulated (plastic) displacement is developed to describe the soil strength degradation at a desired depth.Furthermore, an improved p-y curve model based on cyclic degradation model is proposed to estimate the lateral response of pile under cyclic loads. The improved p-y curve model is embedded into the OpenSees program to investigate the cyclic lateral responses of single soil element and pile. A case study is conducted to verify the improved p-y curve model by comparing with the published centrifuge experiment data.Results indicate that the improved p-y curve model based on T-bar tests data is with high precision and practicability.

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Generalized cyclic p–y curve modeling for analysis of laterally loaded piles

Cited by 56 publications

References 27 publications

A Simplified Method for Analysis of Laterally Loaded Piles considering Cyclic Soil Degradation

A Simplified Method for Analysis of Laterally Loaded Piles considering Cyclic Soil Degradation

Serbest Ve Ri̇ji̇t Başli Açik Deni̇z Teki̇l Kazik Temelleri̇ni̇n Tekrarli Yatay Yükler Etki̇si̇ Altindaki̇ Davranişi

Development of cyclicp–ycurves for laterally loaded pile based on T-bar penetration tests in clay

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