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

Sextos, Anastasios; Mylonakis, George; Mylona, Elli-Konstantina V.

doi:10.1016/j.compstruc.2015.02.013

Cited by 14 publications

(7 citation statements)

References 20 publications

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“…As a matter of fact, both the structures were founded on mono-piles, with the exception of the wall belonging to the dual system, whose foundation was a 3 × 1 group of piles. For this particular piles' layout (mono-piles and/or very small pile groups) the rocking motion induced by kinematic interaction may be important, as outlined also by Sextos et al 14 For common piles' layouts the effect of the rocking component of the foundation motion is instead negligible 15 and SFSI usually leads to a reduction of the seismic demand. This is also consistent with common expectations encoded in design documents such as Eurocode EN-1998-5, 16 claiming that 'for the majority of common building structures, the effects of soil-structure-interaction tend to be beneficial, since they reduce the bending moment and shear forces in the various member of the superstructure'.…”

Section: Introductionmentioning

confidence: 85%

Non‐linear dynamic analysis of buildings founded on piles: Simplified modelling strategies for soil‐foundation‐structure interaction

Noto¹,

Iovino

Laora

et al. 2021

Earthq Engng Struct Dyn

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The paper investigates the problem of Soil-Foundation-Structure Interaction (SFSI) for buildings supported on piles through the comparative analysis between the fixed base and the compliant base assumptions. The structure, a nine-storey residential building (with or without infills), is modelled in nonlinear regime while the piled foundation is idealized by means of independent lumped parameters models, either linear or non-linear. In this last case, the soil-foundation system is replaced by an assembly of viscous-dampers, fictitious masses and non-linear springs modelled according to the classical Bouc-Wen formulation, so as to account for the hysteretic behaviour of the foundation. A detailed calibration procedure for both linear and non-linear foundation models is also presented and discussed. Two different natural soil deposits are considered, a pyroclastic deposit and a deep layer of lacustrine clay. The results undertaken in the context of a probabilistic analysis show that SFSI may lead to a significant reduction of the seismic demand in infilled buildings at low and intermediate earthquake intensity levels. Conversely, at higher intensity earthquakes the seismic demand is not affected by the non-linear springs. It is shown that a proper modelling of radiation mechanism at foundation level is crucial for a reliable and sustainable prediction of SFSI effects.

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Section: Introductionmentioning

confidence: 85%

Non‐linear dynamic analysis of buildings founded on piles: Simplified modelling strategies for soil‐foundation‐structure interaction

Noto¹,

Iovino

Laora

et al. 2021

Earthq Engng Struct Dyn

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“…The pile-group foundation dynamic behavior has been thoroughly investigated in the past [34][35][36][37][38]; hence, the impedance matrix is generated analytically through the formulation proposed by Gazetas and Makris in [37,38] as implemented by the software ASING [39]. As the selected closed form solution has been evaluated in the past [37,38] through comparison with rigorous solution results of pile-group impedance functions, an additional verification is not included within this study.…”

Section: Extraction Of the Soil-foundation Domain Dynamic Stiffnessmentioning

confidence: 99%

Influence of frequency‐dependent soil–structure interaction on the fragility of R/C bridges

Lesgidis

Sextos

Kwon

2016

Earthq Engng Struct Dyn

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Summary Bridge performance under earthquake loading can be significantly influenced by the interaction between the structure and the supporting soil. Even though the frequency dependence of the interaction mentioned in this study has long been documented, the simplifying assumption that the dynamic stiffness is dominated by the mean or predominant excitation frequency is still commonly made, primarily as a result of the associated numerical difficulties when the analysis has to be performed in the time domain. This study makes use of the advanced lumped parameter models recently developed in order to quantify the impact of the assumption on the predicted fragility of bridges mentioned in this study. This is achieved by comparing the predicted vulnerability for the case of a reference, well studied, actual bridge using both conventional, frequency‐independent, Kelvin–Voigt models and the aforementioned lumped parameter formulation. Analysis results demonstrate that the more refined consideration of frequency dependence of soil–structure interaction at the piers and the abutments of a bridge not only leads to different probabilities of failure for given intensity measures but also leads to different hierarchy and distribution of damage within the structure for the same set of earthquake ground motions even if the overall probability of exceeding a given damage state is the same. The paper concludes with the comparative assessment of the effect for different soil conditions, foundation configurations, and ground motion characteristics mentioned in this study along with the relevant analysis and design recommendations. Copyright © 2016 John Wiley & Sons, Ltd.

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“…Tomisawa and Kimura [34] proposed new techniques to improve seismic performance of the pile foundation for long life bridges. e seismic excitation on the pile foundation was also considered in some studies [35,36].…”

Section: Introductionmentioning

confidence: 99%

Improvement on Structural Forms of Pile Group Foundations of Deepwater Bridges

Ren

Tang

et al. 2019

Shock and Vibration

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As long-span cross-sea bridges extend to deeper sea areas, the bridge pile tends to increase in its slenderness ratio and becomes more susceptible to waves. To improve the structural stability at the construction stage, this study analyses wave-induced response of foundations. The wave theory and the method used for computing wave forces on foundations are first introduced. Then, a pile group foundation is taken as the research object, and different pile lengths ranging from 16 m to 46 m are considered. The wave-induced response of the piles and the cap is calculated. After understanding the effect of the pile length, three optimized foundations are proposed with the aim of reducing the free length of the pile, and the corresponding finite element models are established to compare their wave-induced response. The results show that the displacement at the top of the foundation increases with the increase in the pile length until the cap partly emerges from water and so does the internal force at the bottom. Setting a constraint in the middle of the piles can reduce their free lengths and is favourable to the wave-induced response of the foundation except for the shearing force. A stronger constraint shows better effects on improvement of the stability of the foundation. The conclusions provide reference for optimization on pile foundations of deepwater bridges.

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

Cited by 14 publications

References 20 publications

Non‐linear dynamic analysis of buildings founded on piles: Simplified modelling strategies for soil‐foundation‐structure interaction

Non‐linear dynamic analysis of buildings founded on piles: Simplified modelling strategies for soil‐foundation‐structure interaction

Influence of frequency‐dependent soil–structure interaction on the fragility of R/C bridges

Improvement on Structural Forms of Pile Group Foundations of Deepwater Bridges

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