A Centrifuge Modelling and Finite Element Analysis of Laterally Loaded Single Piles in Sand with Focus on P–Y Curves

Haouari, Hocine; Bouafia, Ali

doi:10.3311/ppci.14472

Cited by 8 publications

(7 citation statements)

References 16 publications

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“…This increase is due to the shadowing effect (Brown et al 1988b), as known in the literature. of the pile according to simple beam theory (Yoo et al 2013;Haouari and Bouafia 2020). However, this method is difficult to implement especially when the number of piles is increased and also, the results may alter when derivation is not well utilized.…”

Section: Static Analysis Resultsmentioning

confidence: 99%

Numerical investigation on p–y method of group piles under static and dynamic loads

Timurağaoğlu

Fahjan

Doğangün

2022

Bull Earthquake Eng

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The present study aims at scrutinizing the static and dynamic behavior of pile-soil interaction in the context of py method using finite element analysis. For this purpose, a series of static and dynamic analyses are carried out for single pile, 2x2 and 3x3 group piles in homogeneous clayey soil. In the analysis, the nonlinear behavior of soil is taken into account using a kinematic hardening model, while piles are modeled as elastic. The soil model parameters are calibrated using experimental modulus degradation and damping curves. The pile-soil interface is modeled considering normal and shear behavior to account for separation and sliding between soil and pile elements. In the static analyses, variation of pile moments and displacements with depth and the back-calculated p-y curves are evaluated. The soil resistance is directly obtained by extracting the shear and normal forces of the nodes in a pile at any depth. The p-multipliers for 2x2 and 3x3 group piles are calculated and compared with that of the experiments. The variation of p-multipliers with depth and lateral displacement is also evaluated. In dynamic analyses, first, site response analyses are carried out and validated against one-dimensional results under different loading frequencies. Infinite elements are applied at the boundaries to provide non -reflective boundaries. Later, single, 2x2 and 3x3 group pile analyses are executed. The influence of loading amplitude and frequency on the response are investigated using moment-depth and displacement-depth relationships. Dynamic p-y curves are back-calculated and the results are deeply assessed by comparing with static curves.

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Section: Static Analysis Resultsmentioning

confidence: 99%

Numerical investigation on p–y method of group piles under static and dynamic loads

Timurağaoğlu

Fahjan

Doğangün

2022

Bull Earthquake Eng

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“…Soil was used to control the unit weight of the mixed material. The initial ratio of the cement, gypsum, water, and soil was obtained from previous studies and experience 34 – 37 . The samples were built and cured.…”

Section: Methodsmentioning

confidence: 99%

Study on the vertical bearing performance of pile across cave and sensitivity of three parameters

Chen

Feng

et al. 2021

Sci Rep

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A new method was used to study the performance of pile across cave. This paper investigated the vertical bearing characteristics of piles cross caves using centrifugal model tests and a theoretical model of sensitivity. Twelve pile scenarios were selected, the first was a conventional pile, 24 cm long and 2.5 cm in diameter, with no karst cave as a control. In the other eleven scenarios the piles passed through karst caves of four different heights, of four different spans, and three different numbers of caves. The results reveal that increasing the height, span, and number of caves all are negative for vertical ultimate bearing capacity of piles. The axial force and unit shaft resistance of piles are great different. According to the ratios of the tip and shaft resistance, caves change the type of piles. The sensitivity of vertical ultimate bearing capacity to these factors from high to low is height, number, and span of caves. Importantly, the bearing characteristics of piles decrease faster once the height of the prototype karst cave is higher than 9 m, but decreases slowly when the cave’s span is greater than 9 m × 9 m.

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“…The pile model was modelled by 4 noded quadrilateral stress-displacement shell elements with reduced integration and a large-strain formulation S4R, whereas the soil was modelled by 3D continuum stress/displacement and 8 noded reduced-integration elements C3D8R (Haouari & Bouafia, 2020).…”

Section: Finite Elements Modellingmentioning

confidence: 99%

Single piles under monotonic lateral loads-Full scale tests and numerical modelling

Haouari,

Bouafia

2022

J. Geomec. Geoeng.

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This paper aims to present the results of the analysis of full-scale lateral loading tests of a single pile driven into a bi-layered soil located in Plancoet (France). The pile was subjected to a monotonic sequence of loads, and the P-Y curves along the pile were derived and compared to those recommended by the current design methods. Displacement analysis was then undertaken by inputting these P-Y curves, as well as those currently recommended in the literature, into the software SPULL to predict the load-deflection curve. The calibration process was conducted by a 3D finite element model using Abaqus software based on the elastic-perfectly plastic Mohr–Coulomb constitutive model, and the surface-to-surface contact method was used to take into account the nonlinear response at the pile/soil interface. The determined soil elastic modulus was used to predict the pile deflections by using some usual elasticity-based methods, which led to good prediction of the small pile deflections.

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A Centrifuge Modelling and Finite Element Analysis of Laterally Loaded Single Piles in Sand with Focus on P–Y Curves

Cited by 8 publications

References 16 publications

Numerical investigation on p–y method of group piles under static and dynamic loads

Numerical investigation on p–y method of group piles under static and dynamic loads

Study on the vertical bearing performance of pile across cave and sensitivity of three parameters

Single piles under monotonic lateral loads-Full scale tests and numerical modelling

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