Seismic analysis of infinite pile groups in liquefiable soil

2004 ◽  
Vol 24 (8) ◽  
pp. 565-575 ◽  
Author(s):  
Assaf Klar ◽  
Sam Frydman ◽  
Rafael Baker
Keyword(s):  
Seismic Analysis ◽  
Pile Groups ◽  
Liquefiable Soil

Rotational excitation of bridges supported on pile groups in soft or liquefiable soil deposits

2015 ◽  
Vol 155 ◽  
pp. 54-66 ◽  
Author(s):  
Anastasios G. Sextos ◽  
George E. Mylonakis ◽  
Elli-Konstantina V. Mylona
Keyword(s):  
Rotational Excitation ◽  
Pile Groups ◽  
Soft Or ◽  
Liquefiable Soil ◽  
Soil Deposits

Three-dimensional finite element nonlinear dynamic analysis of pile groups for lateral transient and seismic excitations

2004 ◽  
Vol 41 (1) ◽  
pp. 118-133 ◽  
Author(s):  
Bal Krishna Maheshwari ◽  
Kevin Z Truman ◽  
M Hesham El Naggar ◽  
Phillip L Gould
Keyword(s):  
Finite Element ◽  
Seismic Response ◽  
Radiation Effects ◽  
Seismic Analysis ◽  
Dynamic Stiffness ◽  
Three Dimensional ◽  
Nonlinear Dynamic Analysis ◽  
Element Formulation ◽  
Pile Groups ◽  
Pile Cap

The effects of material nonlinearity of soil and separation at the soil–pile interface on the dynamic behaviour of a single pile and pile groups are investigated. An advanced plasticity-based soil model, hierarchical single surface (HiSS), is incorporated in the finite element formulation. To simulate radiation effects, proper boundary conditions are used. The model and algorithm are verified with analytical results that are available for elastic and elastoplastic soil models. Analyses are performed for seismic excitation and for the load applied on the pile cap. For seismic analysis, both harmonic and transient excitations are considered. For loading on the pile cap, dynamic stiffness of the soil–pile system is derived and the effect of nonlinearity is investigated. The effects of spacing between piles are investigated, and it was found that the effect of soil nonlinearity on the seismic response is very much dependent on the frequency of excitation. For the loading on a pile cap, the nonlinearity increases the response for most of the frequencies of excitation while decreasing the dynamic stiffness of the soil–pile system.Key words: pile groups, plasticity, separation, dynamic stiffness, seismic response.

scholarly journals Seismic Behaviour of Piles in Non-Liquefiable and Liquefiable Soil

2021 ◽  
Author(s):  
Fouad Hussein ◽  
Hesham El Naggar
Keyword(s):  
Finite Element ◽  
Ground Motion ◽  
Numerical Models ◽  
Bending Moment ◽  
Soil Liquefaction ◽  
Shaking Table ◽  
Pile Groups ◽  
Kinematic Interaction ◽  
Inertial Interaction ◽  
Liquefiable Soil

Abstract This paper investigates the nonlinear soil-pile-structure interaction (SPSI) employing three-dimensional (3D) nonlinear finite element models (FEM) verified with the results of large-scale shaking table tests of model pile groups-superstructure systems. The responses of piles in both liquefiable and non-liquefiable soil sites to ground motion with varying intensities were evaluated considering both kinematic and inertial interaction. The calculated piles and soil responses agreed well with the responses measured during the shaking events. The numerical models correctly predicted the different pile deformation modes that were exhibited in the experiments. The finite element analysis (FEA) was then employed to perform a parametric study to evaluate the kinematic and inertial effects on the piles' response, considering different ground motion levels and piles characteristics. It was found that the bending moment of piles in the liquefiable site increases significantly, compared to the non-liquefiable site, due to the loss of lateral support of the liquified soil, and the maximum bending moment occurs at the interface between the liquified and liquefied sand layers. The inertial interaction contributes the most to the bending moments at the pile top and the interface between the top clay and liquefied loose sand layers. For piles with a larger diameter, the bending moment due to kinematic interaction increases significantly, and the bending moment distribution corresponds to short (rigid) pile behaviour. In addition, the piles at the saturated site displace laterally as a rigid body during strong ground motions because the pile base loses the lateral support due to the soil liquefaction. Finally, the kinematic interaction effect becomes more significant for piles with higher elastic modulus.

Seismic analysis of piles and pile groups in liquefiable sand

2020 ◽  
pp. 287-292
Author(s):  
W.D. Liam Finn ◽  
T. Thavaraj ◽  
D.W. Wilson ◽  
R.W. Boulanger ◽  
B.L. Kutter
Keyword(s):  
Seismic Analysis ◽  
Pile Groups

Seismic Analysis for Pile Foundations in the Liquefiable Soil Layer Using FLAC3D

2015 ◽  
Vol 764-765 ◽  
pp. 1114-1118
Author(s):  
Yuan Chieh Wu ◽  
Che Wei Hu
Keyword(s):  
Seismic Response ◽  
Seismic Analysis ◽  
Soil Layer ◽  
Response Prediction ◽  
Practical Method ◽  
Soil Liquefaction ◽  
Nuclear Industry ◽  
Pile Foundations ◽  
Centrifuge Model Test ◽  
Liquefiable Soil

Pile foundation is the practical method to enhance earthquake-resistant ability for structures located in liquefiable soil sites. Soil liquefaction impact has been occurred such as Kashiwazaki-Kariwa NPP in 2007 Chūetsu offshore earthquake because of the soft backfill soil. To understand the behavior of pile foundations in liquefied soil during earthquake attack and conform to nuclear standard, seismic analysis with soil-structure interaction considering liquefaction using the finite difference program FLAC3D is developed to renew the traditional method used in nuclear industry. The models are verified according to a series of centrifuge model test results conducted in National Central University, Taiwan, to show the accuracy of seismic response prediction, and it provides the more advanced tool to demonstrate the detail of seismic response so that the utility and authority can easily decide the disaster prevention strategy.

scholarly journals Seismic Behaviour of Piles in Non-Liquefiable and Liquefiable Soil

2021 ◽  
Author(s):  
Fouad Hussein ◽  
Hesham El Naggar
Keyword(s):  
Ground Motion ◽  
Large Scale ◽  
Numerical Models ◽  
Bending Moment ◽  
Shaking Table ◽  
Pile Groups ◽  
Seismic Behaviour ◽  
Kinematic Interaction ◽  
Inertial Interaction ◽  
Liquefiable Soil

Abstract This paper investigates the nonlinear soil-pile-structure interaction (SPSI) employing three-dimensional (3D) nonlinear finite element (FE) models verified with the results of large-scale shaking table tests of model pile groups-superstructure systems. The responses of piles in both liquefiable and non-liquefiable soil sites to ground motion with varying intensities were evaluated considering both kinematic and inertial interaction. The calculated piles and soil responses agreed well with the responses measured during the shaking events. The numerical models correctly predicted the different pile deformation modes that were exhibited in the experiments. The FEA was then employed to perform a parametric study to evaluate the kinematic and inertial effects on the piles' response considering different ground motion levels and piles characteristics. It was found that the bending moment of piles in the liquefiable site increases significantly, compared to the non-liquefiable site, due to the loss of lateral support of the liquified soil, and the maximum bending moment occurs at the interface between the liquified and non-liquefied sand layers. The inertial interaction contributes the most to the bending moments at the pile top and the interface between the top clay and liquefied loose sand layers. For piles with a larger diameter, the bending moment due to kinematic interaction increases significantly and the bending moment distribution corresponds to short (rigid) pile behaviour. In addition, the piles at the saturated site displace laterally as a rigid body during strong ground motions because the pile base loses the lateral support due to the liquefaction of the bottom dense sand. Finally, the kinematic interaction effect becomes more significant for piles with higher elastic modulus.

scholarly journals Seismic analysis of pile in liquefiable soil and plastic hinge

2017 ◽  
Vol 4 (4) ◽  
pp. 203-213 ◽  
Author(s):  
Rohollah Rostami ◽  
Nicholas Hytiris ◽  
Subhamoy Bhattacharya ◽  
Martin Giblin
Keyword(s):  
Seismic Analysis ◽  
Plastic Hinge ◽  
Liquefiable Soil
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