A modulus‐multiplier approach for non‐linear analysis of laterally loaded pile groups

Fan, Chia-Cheng; Long, James H.

doi:10.1002/nag.582

Cited by 12 publications

(4 citation statements)

References 11 publications

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“…Generally speaking, the soil is inhomogeneous not only in the vertical direction but also in the radial direction, especially for the soil region adjacent to the pile for the reason that the soil properties may be changed during pile construction when soil compaction or soil relaxation may occur. Some investigators [11,12] have dealt with the soil inhomogeneity by means of numerical finite element methods but rarely, if at all, by analytical methods. Guo and Randolph [13] addressed the response of axially loaded pile in a generic inhomogeneous soil where stiffness and strength vary monotonically with depth, but did not consider soil inhomogeneity in the radial direction.…”

Section: Introductionmentioning

confidence: 99%

Vertical dynamic response of pile in a radially heterogeneous soil layer

Yang

Wang

Zhang

et al. 2008

Num Anal Meth Geomechanics

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SUMMARYAn analysis of a pile vertical response considering soil inhomogeneity in the radial direction under dynamic loads is presented. The solution technique is based on a three-dimensional axisymmetric model, which includes the consideration of the vertical displacement of the soil. The soil domain is subdivided into a number of annular vertical zones, and the continuity of the displacements and stresses are imposed at both the interface of pile-soil and the interfaces of adjacent soil zones to establish the dynamic equilibrium equations of the pile-soil interaction. Then, the equations of each soil zone and of the pile are solved one by one to obtain the analytical and semi-analytical dynamic responses at the top of the pile in the frequency domain and time domain. Parametric studies have been performed to examine the influence of soil parameters' variations in the radial direction caused by the construction effect on the dynamic responses of pile. The results of the studies have been summarized and presented in figures to illustrate the influences of the soil parameters as they change radially. The effect of the radius of the disturbed soil zone caused by construction is also studied in this paper.

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Section: Introductionmentioning

confidence: 99%

Vertical dynamic response of pile in a radially heterogeneous soil layer

Yang

Wang

Zhang

et al. 2008

Num Anal Meth Geomechanics

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“…Ochoa and O'Neill [52], based on the experimental results in submerged sand, have developed the interaction factors dependent on the angle between the load vector and the line that connects the pile heads. Fan and Long [53] analyzed the interaction between the piles under various loading directions and derived the modulus reduction factors to account for the interaction effects at the ultimate limit state. Su and Yan [54] formulated the multidirectional p-y model for sands that was incorporated into FEM and validated through the simulations of piles under unidirectional and multidirectional lateral loading.…”

Section: Introductionmentioning

confidence: 99%

Flexible Pile Group Interaction Factors under Arbitrary Lateral Loading in Sand

Marjanović

Vukićević

König

2020

JMSE

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Marine and harbor structures, wind turbines, bridges, offshore platforms, industrial chimneys, retaining structures etc. can be subjected to significant lateral loads from various sources. Appropriate assessment of the foundations capacity of these structures is thus necessary, especially when these structures are supported by pile groups. The pile group interaction effects under lateral loading have been investigated intensively in past decades, and the most of the conducted studies have considered lateral loading that acts along one of the two orthogonal directions, parallel to the edge of pile group. However, because of the stochastic nature of its source, the horizontal loading on the pile group may have arbitrary direction. The number of studies dealing with the pile groups under arbitrary loading is very limited. The aim of this paper is to investigate the influence of the arbitrary lateral loading on the pile group response, in order to improve (extend) the current design approach for laterally loaded pile groups. Free head, flexible bored piles in sand were analyzed through the extensive numerical study. The main hypothesis of the research is that some critical pile group configurations, loading directions, and soil conditions exist, which can lead to the unsafe structural design. Critical pile positions inside the commonly used pile group configurations are identified with respect to loading directions. The influence of different soil conditions was discussed.

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“…The main drawbacks of the experimental studies are the difficulty to simulate soil layers, which can vary for different sites, and model the pile groups with non-homogeneous pile distribution. Numerical works including the finite difference method (FDM) and the finite element method (FEM) also exist in the literature to analyze the pile groups or determine the p-multipliers (Bransby 1996;Brown and Shie 1991;Comodromos and Pitilakis 2005;Elhakim et al 2016;Fan et al 2007;Larsson et al 2012;Law and Lam 2001;Papadopoulou and Comodromos 2010;Wu et al 2015;Yang and Jeremi'c 2003). Especially, the finite element method has been often applied to analyze pile groups.…”

Section: Introductionmentioning

confidence: 99%

Modeling of pile-soil-pile interaction in laterally loaded pile groups embedded in linear elastic soil layers

Isbuga

2020

Arab J Geosci

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This study proposes a new method to obtain the lateral response of pile groups by incorporating the pile group effect in layered soils. When a pile is loaded laterally, it creates a zone of influence in the direction of loading. In a pile group, each pile placed in the influence zone of prior piles is exposed to extra loads due to the load transfers from other piles. This mechanism results in a group effect which causes each pile in the group to have a different deflection curve compared to that of an identical isolated single pile under the same load. This study starts with a mathematical approach to model the interaction of two piles and then extends it to pile groups. The governing differential equation of a pile deflection problem is modified to take the pile-soil-pile interaction into account and solved analytically for each pile while the soil parameters and displacement fields around each pile are obtained numerically using the finite difference method written in Fortran language. The model captures the additional pile deflections induced by the group effects in pile groups and the results match well with the results of the existing methods, especially the finite element method.

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A modulus‐multiplier approach for non‐linear analysis of laterally loaded pile groups

Cited by 12 publications

References 11 publications

Vertical dynamic response of pile in a radially heterogeneous soil layer

Vertical dynamic response of pile in a radially heterogeneous soil layer

Flexible Pile Group Interaction Factors under Arbitrary Lateral Loading in Sand

Modeling of pile-soil-pile interaction in laterally loaded pile groups embedded in linear elastic soil layers

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