Investigation of pile‐induced filtering of seismic ground motion considering embedment effect

Varghese, Ramon; Boominathan, A.; Banerjee, Subhadeep

doi:10.1002/eqe.3506

Cited by 11 publications

(5 citation statements)

References 53 publications

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“…Laora and Sanctis (2013) found out that the filtering effect of piles in a homogeneous layer is governed by a unique dimensionless frequency parameter that is proportionate to the ratio of a characteristic pile wavelength λ p over the soil wavelength V s /ω, where V s is the shear wave velocity of the soil layer. Varghese et al (2021) investigated the influence of embedment on the kinematic response of pile groups via a thorough set of numerical parametric studies. The authors proposed a set of simplified formula to quantify changes in the spectral acceleration ratio due to embedment.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear dynamic analysis of soil-pile interactions of nuclear power plants with nonlithological foundation

Sui

Wang²,

2023

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PurposeThe dynamic response of the nuclear power plants (NPPs) with pile foundation reinforcement have not yet been systemically investigated in detail. Thus, there is an urgent need to improve evaluation methods for nonlithological foundation reinforcements, as this issue is bound to become an unavoidable task.Design/methodology/approachA nonlinear seismic wave input method is adopted to consider both a nonlinear viscoelastic artificial boundary and the nonlinear properties of the overburden layer soil. Subsequently, the effects of certain vital parameters on the structural response are analyzed.FindingsA suitable range for the size of the overburden foundation is suggested. Then, when piles are used to reinforce the overburden foundation, the peak frequencies in the floor response spectra (FRS) in the horizontal direction becomes higher (38%). Finally, the Poisson ratio of the foundation soil has a significant influence on the FRS peak frequency in the vertical direction (reduce 35%–48%).Originality/valueThe quantifiable results are performed to demonstrate the seismic responses with respect to key design parameters, including foundational dimensions, the Poisson Ratio of the soil and the depth of the foundation. The results can help guide the development of seismic safety requirements for NPPs.

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Section: Introductionmentioning

confidence: 99%

Nonlinear dynamic analysis of soil-pile interactions of nuclear power plants with nonlithological foundation

Sui

Wang²,

2023

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“…Studies 28 also investigated the effect of superstructure on the natural frequency of the foundation system resting on a Winkler medium. Works are also carried out to understand the dynamic behavior of CPRF 29 and piles 30–31 considering the soil‐structure interaction effects. Although these works indicate notable advancements regarding the behavior of CPRF under dynamic condition, further rigorous studies are required to gain a profound understanding on this subject.…”

Section: Introductionmentioning

confidence: 99%

Closed‐form solution for natural frequency of flexible combined pile‐raft foundation

Bhaduri,

Choudhury

2023

Earthq Engng Struct Dyn

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Dynamic attributes of flexible combined pile‐raft foundation (CPRF) hold paramount importance in assessing the behavior of it, especially in an earthquake prone area. The present study proposes a closed‐form solution for obtaining the natural frequency of flexible CPRF, where the piles and raft are represented as beam and thin plate respectively, lying on a two‐parameter Pasternak medium. Two simultaneous governing differential equations for the components are formulated and closed form solutions are obtained for finding the natural frequency and transient horizontal displacement of the foundation system. The complex soil‐structure interactions associated with the load‐bearing mechanism of CPRF is incorporated in the analysis scheme. The proposed method is validated with available centrifuge test result. Further parametric studies showcase that with decrease in raft thickness, the spectral acceleration response of the raft decreases. Also, for CPRF with high raft flexibility, the natural frequency of the foundation in dense sand is 34% and 53% higher compared to medium dense and loose sands, respectively. Thus, the present method can be reckoned as a notable contribution in comprehending the dynamic behavior of flexible CPRF.

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“…Usually, the seismic dynamic response of rock mass engineering mostly adopts the finite element method, finite difference method, finite volume method, boundary element method, etc. [2][3][4][5][6][7][8]. These numerical methods concentrate on the elastic-plastic analysis.…”

Section: Introductionmentioning

confidence: 99%

Investigation of 2D Seismic DDA Method for Numerical Simulation of Shaking Table Test of Rock Mass Engineering

Kang

Sheng

et al. 2022

Mathematics

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Since the basic theory of the discontinue deformation analysis (DDA) method was proposed, the DDA open source has gone through a long development process. At present, different kinds of programs have been widely applied in rock mass engineering such as slope, dam, and tunnel. This paper introduces the solution principle of DDA motion equations in detail, as well as the development status of the 2D open-source program. Numerical simulation of shaking table test of rock mass engineering using 2D DDA program is highlighted, and investigations of seismic wave pre-processing and seismic input method are carried out. First, based on the Newmark integration scheme, the integration algorithms of synthetic or measured seismic wave time history, correction function of seismic wave, and DDA simulation are unified. Then, three seismic input methods are implanted in the DDA program, and the applicability of various seismic input methods is discussed. On this basis, using the improved seismic 2D DDA program, a shaking table test of typical rock mass engineering is simulated. Through the comparison between the theoretical/test data and simulation results, the reliability of the improved DDA program in seismic response analysis is verified; the large mass method and the large stiffness method are more suitable for rigid foundation, such as shaking table test; the propagation of the seismic wave presents a significant amplification effect due to the reflection, refraction, and diffraction in the tunnel. The research results provide DDA theory and an open-source program for analyzing the seismic response of rock mass engineering.

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Investigation of pile‐induced filtering of seismic ground motion considering embedment effect

Cited by 11 publications

References 53 publications

Nonlinear dynamic analysis of soil-pile interactions of nuclear power plants with nonlithological foundation

Nonlinear dynamic analysis of soil-pile interactions of nuclear power plants with nonlithological foundation

Closed‐form solution for natural frequency of flexible combined pile‐raft foundation

Investigation of 2D Seismic DDA Method for Numerical Simulation of Shaking Table Test of Rock Mass Engineering

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