Influence of soil non-homogeneity on the base shear force of piled structures subjected to harmonic seismic waves

Medina, Cristina; Álamo, Guillermo M.; Aznárez, Juan J.; Padrón, Luis A.; Maeso, Orlando

doi:10.1016/j.engstruct.2020.110658

Cited by 5 publications

(5 citation statements)

References 23 publications

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“…In the theoretical calculations, it is assumed that the strata are uniformly distributed, and the equivalent soil layer method can be used to convert non-uniform strata into uniformly distributed soil layers. Numerous studies have proven the applicability of the equivalent soil layer method [29][30][31]. Other parameters can be calculated based on design data, but currently, there is no research indicating a clear value for the pile curve shape coefficient ξ.…”

Section: Comparative Analysis Of Resultsmentioning

confidence: 99%

Spatial Deformation Calculation and Parameter Analysis of Pile–Anchor Retaining Structure

Yin

2023

Applied Sciences

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Scholars often consider the deformation of a foundation pit retaining structure as a significant indicator of its stability. However, the current theoretical prediction formula for pit with pile–anchorretaining structure deformation is not yet perfect. This study utilizes a simplified spatial deformation model of a pile–anchorretaining structure and the principle of minimum potential energy to derive a prediction formula for the retaining structure’s spatial deformation. Afterwards, a numerical simulation model is developed based on actual engineering practices. On-site monitoring data is compared with the results of theoretical calculation formulas and numerical simulation models to validate their applicability. The research findings reveal minimal discrepancies between the theoretical calculation results, numerical simulation outcomes, and on-site monitoring data, indicating a high level of accuracy. Those three results follow consistent rules. The horizontal deformation curve of the crown beam exhibits a ‘V’-shaped distribution, and as the distance from the calculation point to the centerline of the foundation pit decreases, the horizontal deformation of the crown beam increases. The horizontal deformation curve of the pile displays a ‘V’-shaped distribution, and the pile’s horizontal deformation increases as the distance to the centerline of the foundation pit decreases. The research findings indicate that increasing the size and material strength of the crown beam and waist beam has only a limited effect on controlling the retaining structure’s deformation. However, by increasing the size and material strength of the pile, the deformation of the retaining structure can be significantly reduced.

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Section: Comparative Analysis Of Resultsmentioning

confidence: 99%

Spatial Deformation Calculation and Parameter Analysis of Pile–Anchor Retaining Structure

Yin

2023

Applied Sciences

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“…Thus, it is very interesting to study wave transformation and the coupling/decoupling of the applied forces with the system due to MPs. This can be done with the same procedure as for other types of piles, as in the work of Xie et al [25], who performed numerical analysis validated by shaking table tests; or analytically, as the in the work of Medina et al [26] who used an analytical solution to calculate the response of a structure (Q) as a function of several parameters, e.g., kinematic interaction factors and impedance functions. The same concept can be used for MPs, after investigating how these parameters can be suitable for each type of MP; for example, the impedance function that allows for soil stiffness and damping coefficient can be expanded to be "unaffected" by soil stiffness and damping coefficient, which are added to the "affected" by soil stiffness and damping coefficient due to MPs, and eventually the final matrix can be formed.…”

Section: Behavior Of Mps In Association With Seismic Dampersmentioning

confidence: 99%

“…Equation ( 1) is the impedance function as presented in [26], with k ij the soil stiffness and c ij the soil damping coefficient. In Equation (2), k ij.us and k ij.as are the unaffected and affected soil stiffness values, respectively, while c ij.us and c ij.as are the unaffected and affected soil damping coefficients, respectively, as proposed; these values can be obtained from numerical models or by analytical equations.…”

Section: Behavior Of Mps In Association With Seismic Dampersmentioning

confidence: 99%

Seismic Behavior of Micropiles and Micropiled Structures Used for Increasing Resilience: A Literature Review

Alhaija

Batali

2022

Applied Sciences

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The aim of this paper is to present the relevant information and development available in the scientific literature regarding the seismic behavior of micropiles (MPs) and micropiled structures (MPed). The seismic behavior of MPs is not very well studied, but MPs are used in retrofitting of old buildings and for new resilient buildings, and in terms of seismic behavior they have a high potential. Additionally, their association with seismic dampers for improving the seismic behavior of buildings is not yet fully studied and it represents a major topic of interest for both new structures and historical monuments. After the introductory part, the paper describes all relevant information regarding MPs, as types and technology, seismic behavior, applications for increasing seismic resilience, and experimental and numerical modeling.

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“…Step 3. By using the solutions for the deflection of the beam and foundation, a new value of c 2 is computed using formulation (21). e load q � 400 N/m 2 is a uniformly distributed load applied to the entire beam, and the concentrated force P � 400 kN is applied at the middle of the span.…”

Section: Iterative Process An Effective Iterative Technique For Solving the Problem Of A Finite-length Beam On A Gibson Elastic Foundatiomentioning

confidence: 99%

“…Eisenberger and Clastornik [20] presented the two methods for the analysis of beams on variable two-parameter foundations. Medina et al [21] analysed the influence of soil nonhomogeneity on the base shear forces of piled structures subjected to harmonic seismic waves. Ma et al [22] developed an analytical method for the stability analysis of beams on modified Vlasov foundations subjected to lateral loads acting on the ends by using the variational principle.…”

Section: Introductionmentioning

confidence: 99%

A Refined Model for Analysis of Beams on Two-Parameter Foundations by Iterative Method

Yue

2021

Mathematical Problems in Engineering

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It is of great significance to study the interactions between structures and supporting soils for both structural engineering and geotechnical engineering. In this paper, based on the refined two-parameter elastic foundation model, the bending problem for a finite-length beam on Gibson elastic soil is solved. The effects of axial force and soil heterogeneity on the bending behaviours and stress states of beams on elastic foundations are discussed, and the parameters of the physical model are determined reasonably. The beam and elastic foundation are treated as a single system, and the complete potential energy is obtained. Based on the principle of minimum potential energy, the governing differential equations for the beam bearing axial force on the Gibson foundation are derived, and the equations for attenuation parameters are also defined. The problem of the unknown parameters in foundation models being difficult to determine is solved by an iterative method. The results demonstrate that this calculation method is feasible and accurate, and that the applied theory is universal for the analysis of interactions between beams and elastic foundations. Both axial force and soil heterogeneity have a certain effect on the deformation and internal force of beams on elastic foundations, and the vertical elastic coefficient of foundations is mainly determined by the stiffness of the surface soil. Additionally, attenuation parameters can be obtained relatively accurately by an iterative method, and then the vertical elastic coefficient and shear coefficient can be further obtained. This research lays a foundation for the popularisation and application of the two-parameter elastic foundation model.

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Influence of soil non-homogeneity on the base shear force of piled structures subjected to harmonic seismic waves

Cited by 5 publications

References 23 publications

Spatial Deformation Calculation and Parameter Analysis of Pile–Anchor Retaining Structure

Spatial Deformation Calculation and Parameter Analysis of Pile–Anchor Retaining Structure

Seismic Behavior of Micropiles and Micropiled Structures Used for Increasing Resilience: A Literature Review

A Refined Model for Analysis of Beams on Two-Parameter Foundations by Iterative Method

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