Three-Dimensional Nonlinear Seismic Analysis of Pile Groups Using FE-CIFECM Coupling in a Hybrid Domain and HISS Plasticity Model

Maheshwari, B. K.; Emani, Pavan Kumar

doi:10.1061/(asce)gm.1943-5622.0000335

Cited by 14 publications

(2 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…10 However, that study was restricted to the pile group foundation under the vertical harmonic excitation only. Maheshwari and Emani 11 carried out the 3D nonlinear FEM coupled with consistent infinitesimal finite-element cell method (CIFECM) for the seismic analysis of pile groups. Syed and Maheshwari 12 performed the nonlinear time domain analysis for the single pile with the coupled FEM-SBFEM and calculated the dynamic impedance and kinematic interaction factors.…”

Section: Introductionmentioning

confidence: 99%

A new nonlinear spring‐dashpot model of CPRF of NPP structure based on coupled BEM‐FEM approach

Firoj

Maheshwari

2022

Earthq Engng Struct Dyn

View full text Add to dashboard Cite

In this paper, a BEM‐FEM coupled model of combined piled raft foundation (CPRF) is proposed for both the frequency domain and the time domain dynamic analyses of a NPP structure in the linear, equivalent linear and nonlinear soil domain. The piles are modeled using the finite element method as a beam element, while the raft and internal domain of soil are modeled using the eight nodded brick element. It is assumed that the piles are rigidly connected with the raft. The nonlinearity of soil is modeled using the hyperbolic stress–strain relation and Modified Drucker–Prager Model. The boundary of the layered soil domain is modeled using the boundary element method. For simplification, it is assumed that the raft and piles are rigidly connected with the soil that means there are no slip and separation conditions at the interface of pile‐soil and raft‐soil. In order to validate the proposed approach, numerical results, that is, impedances in the horizontal, vertical and rocking directions, are compared with the published literature. Further, dynamic analyses of a lumped structure founded on CPRF is carried out in the time domain and frequency domain using these impedances and results are compared with the FEM. It is found that the spring‐dashpot models give the reasonably good agreement with finite element method for linear, equivalent linear and nonlinear models for both frequency domain and time domain analyses. Moreover, practical application of proposed model is shown for a very large problem of raft‐pile‐soil‐structure interaction such as a NPP structure on the layered soil. It was found that the nonlinearity significantly increases the response of the NPP structure. The proposed model has many advantage over the finite element model, for example, first it is very simple and second it reduced the computation time significantly with the good accuracy.

show abstract

Section: Introductionmentioning

confidence: 99%

A new nonlinear spring‐dashpot model of CPRF of NPP structure based on coupled BEM‐FEM approach

Firoj

Maheshwari

2022

Earthq Engng Struct Dyn

View full text Add to dashboard Cite

show abstract

“…The frequency dependence of the stiffness of the unbounded domain along with the stress waves and their multiple reflections makes the modelling of this domain the most challenging part. Although classical solutions of this SSI problem are obtained either in the frequency domain (Emani and Maheshwari, 2009;Spyrakos and Xu, 2003;Wolf, 1985), or hybrid domain (Emani and Maheshwari, 2010;Maheshwari and Emani, 2015), the dynamic analysis is intuitively done only in time domain using the numerical integration of the equations of motion. The displacement boundary conditions are highly inappropriate at the truncated interface since such boundaries cause considerable reflection of waves leading to chaotic results in the finite geometry (Kramer, 1996).…”

Section: Introductionmentioning

confidence: 99%

Time Domain Implementation of Transmitting Boundaries in ABAQUS for Discrete Soil-structure Interaction Systems

Patchamatla¹,

Emani²

2020

Int J Math, Eng, Manag Sci

View full text Add to dashboard Cite

Soil-structure-interaction (SSI) analyses are essential to evaluate the seismic performance of important structures before finalizing their structural design. SSI under seismic condition involves much more complex interaction with soil compared to the dynamic loads having source on the structure. Seismic SSI analysis requires due consideration of site-specific and structure-specific properties to estimate the actual ground motion (scattered motion) experienced at the base of the structure, and subsequently the effects of the scattered motion on the structure. Most challenging aspect of seismic SSI analysis is to implement transmitting boundaries that absorb the artificial reflections of stress waves at the truncated interface of the finite and infinite domains, while allowing the seismic waves to enter the finite domain. In this paper, the time domain implementation of seismic analysis of a soil-structure system is presented using classical discrete models of structure and interactive force boundary conditions for soil. These models represent typical SSI systems- a single Degree of Freedom (DOF) of a spherical cavity with mass attached to its wall, a two DOF system consisting of a mass attached by a nonlinear spring to a semi-infinite rod on elastic foundation, and a three DOF system with additional DOFs for modelling the structural stiffness and damping. The convolution integral representing the force boundary condition on the truncated interface, is evaluated interactively using UAMP user-subroutine in ABAQUS and applied as concentrated forces at the interface (truncated interface) nodes of the bounded domain or generalized-structure domain. The verification problems presented in the paper show the satisfactory performance of the developed MATLAB code and ABAQUS implementation with FORTRAN user-subroutines. The classical phenomena associated with the dynamic soil-structure systems are discussed through the present work.

show abstract

A State of Art: Seismic Soil–Structure Interaction for Nuclear Power Plants

Maheshwari

Firoj

2021

Springer Transactions in Civil and Environmental Engineering

View full text Add to dashboard Cite

Three-Dimensional Nonlinear Seismic Analysis of Pile Groups Using FE-CIFECM Coupling in a Hybrid Domain and HISS Plasticity Model

Cited by 14 publications

References 31 publications

A new nonlinear spring‐dashpot model of CPRF of NPP structure based on coupled BEM‐FEM approach

A new nonlinear spring‐dashpot model of CPRF of NPP structure based on coupled BEM‐FEM approach

Time Domain Implementation of Transmitting Boundaries in ABAQUS for Discrete Soil-structure Interaction Systems

A State of Art: Seismic Soil–Structure Interaction for Nuclear Power Plants

Contact Info

Product

Resources

About