Dynamic impedances of pile groups with embedded caps in homogeneous elastic soils using CIFECM

Emani, Pavan Kumar; Maheshwari, B. K.

doi:10.1016/j.soildyn.2008.11.003

Cited by 43 publications

(9 citation statements)

References 16 publications

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“…Compared with many analytical and numerical solutions for the static interaction problem, few literatures can be found on the investigation of piled raft foundations subjected to dynamic loadings. Based on the coupling of FEM and consistent infinitesimal finite element cell method (CIFECM), Emani and Maheshwari studied the dynamic impedances of piled raft foundations, where the rafts are in contact with the surrounding soil. In the literature , the piled raft and the surrounding soil in near field were modeled using the FEM, which would require significant computational efforts for the case of larger piled raft systems consisting of many piles.…”

Section: Introductionmentioning

confidence: 99%

Vertical harmonic vibration of piled raft foundations in layered soils

Liu

2017

Num Anal Meth Geomechanics

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Summary This paper develops a method to analyze the piled raft foundation under vertical harmonic load. This method takes into account the interactions among the piles, soil, and raft. The responses of the piles and raft are formulated as a series of equations in a suitable way and that of layered soils is simulated with the use of the analytical layer‐element method. Then, according to the equilibrium and continuity conditions at the piles–soil–raft interface, solutions for the piled raft systems are obtained and further demonstrated to be correct through comparing with the existing results. Finally, some examples are given to investigate the influence of the raft, pile length‐diameter ratio, and layering on the response of the piled raft foundations. Copyright © 2017 John Wiley & Sons, Ltd.

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Section: Introductionmentioning

confidence: 99%

Vertical harmonic vibration of piled raft foundations in layered soils

Liu

2017

Num Anal Meth Geomechanics

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“…Studies by Liu and Ai [2017] suggest that the presence of soft layer below raft has a prominent impact on vertical impedance of PG with ground contacting cap at higher frequencies. Numerical analyses by Emani and Maheshwari [2009] concluded that the e®ect of embedded pile cap may not always be on the safer side in comparison with free standing pile cap. In the present study, impedances of the massless PR system as shown in Fig.…”

Section: E®ect Of Pile Spacing On Dynamic Impedancesmentioning

confidence: 99%

“…Mayoral and Romo [2015] and Nakai et al [2004] carried out the three-dimensional seismic response analysis of a bridge support and a centrifuge model, respectively, in SASSI. Emani and Maheshwari [2009] and Liu and Ai [2017] have employed numerical as well as semianalytical tools to study the e®ect of raft embedded into shallow layers on the dynamic impedances of PGs. From these studies, it is postulated that an embedded pile cap/raft can result in signi¯cant di®erences in dynamic sti®ness and damping parameters, particularly, at higher frequencies.…”

Section: Introductionmentioning

confidence: 99%

Seismic Response Characteristics of a Piled Raft in Clay

Varghese

Boominathan

Banerjee

2019

J. Earthquake and Tsunami

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This paper presents a study on three-dimensional seismic soil–structure interaction analysis of a piled-raft (PR) foundation in clay by the substructure approach. Two different pile modeling techniques were adopted and compared with centrifuge shaking table test results reported in the literature. The effect of pile spacing on dynamic impedances, kinematic response parameters, axial pile forces and bending moments of PRs is studied. It is found that the presence of a rigid raft on a pile group results in significant variation in vertical and horizontal dynamic stiffness after a dimensionless frequency ([Formula: see text] value of around 0.22. The influence of raft on kinematic response parameters at the top of raft is found to be significantly influenced by pile spacing beyond a dimensionless frequency ([Formula: see text] value of 0.4. The axial forces generated at the pile heads of a PR–structure system during seismic shaking are quantified using a new dimensionless factor, and are found to be significantly influenced by the pile spacing. Pile layout in the PR system is found to play an influential role in seismic response as well as pile bending moment for a structure–PR–soil system studied.

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“…The combination of the two methods, well known as FEM/BEM approach [6][7][8], allows an accurate description of the near field (FEM model) and a reliable estimation of the far-field (BEM model). Researchers have also proposed the use of finite difference method (FDM) [9], the infinitesimal finite element cell method (CIFECM) [10] or the finite layer theory [11].…”

Section: Introductionmentioning

confidence: 99%