Identification of transient vibration characteristics of pile-group models during liquefaction using wavelet transform

Hall, F. E.; Lombardi, Doménico; Bhattacharya, Subhamoy

doi:10.1016/j.engstruct.2018.06.028

Cited by 17 publications

(3 citation statements)

References 34 publications

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“…If the physical modelling of the collapse of pile-supported structures during the earthquake was conducted with no axial load (or pile head mass), the buckling instability mechanism of slender piles would not be invoked. An example of dimensional analysis for piles in liquefiable soils can be found in [26]. Therefore, identification of the correct mechanism is necessary for the right scaling.…”

Section: Steps In Designing Scaled Mode Testsmentioning

confidence: 99%

“…One of the important considerations is the change in dynamic performance due to the application of cyclic loading. This change may be significant in the presence of loose deposits, which may liquefy as a result of cyclic loadings [26,[35][36][37]. One of the ways to White noise testing was trialed because it offered the possibility of acquiring data at more frequent intervals during long-term tests due to its greater potential for automation over free vibration tests.…”

Section: Measurement Of Dynamic Response and Type 2 Techniquementioning

confidence: 99%

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Physical Modelling of Offshore Wind Turbine Foundations for TRL (Technology Readiness Level) Studies

Bhattacharya

Lombardi

Amani

et al. 2021

JMSE

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Offshore wind turbines are a complex, dynamically sensitive structure due to their irregular mass and stiffness distribution, and complexity of the loading conditions they need to withstand. There are other challenges in particular locations such as typhoons, hurricanes, earthquakes, sea-bed currents, and tsunami. Because offshore wind turbines have stringent Serviceability Limit State (SLS) requirements and need to be installed in variable and often complex ground conditions, their foundation design is challenging. Foundation design must be robust due to the enormous cost of retrofitting in a challenging environment should any problem occur during the design lifetime. Traditionally, engineers use conventional types of foundation systems, such as shallow gravity-based foundations (GBF), suction caissons, or slender piles or monopiles, based on prior experience with designing such foundations for the oil and gas industry. For offshore wind turbines, however, new types of foundations are being considered for which neither prior experience nor guidelines exist. One of the major challenges is to develop a method to de-risk the life cycle of offshore wind turbines in diverse metocean and geological conditions. The paper, therefore, has the following aims: (a) provide an overview of the complexities and the common SLS performance requirements for offshore wind turbine; (b) discuss the use of physical modelling for verification and validation of innovative design concepts, taking into account all possible angles to de-risk the project; and (c) provide examples of applications in scaled model tests.

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Section: Steps In Designing Scaled Mode Testsmentioning

confidence: 99%

Section: Measurement Of Dynamic Response and Type 2 Techniquementioning

confidence: 99%

Physical Modelling of Offshore Wind Turbine Foundations for TRL (Technology Readiness Level) Studies

Bhattacharya

Lombardi

Amani

et al. 2021

JMSE

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“…Kramer et al [14] reported that these pulses have amplitudes smaller than those of the pulses that occur prior to liquefaction, but in some cases, the peak ground acceleration of the entire motion is produced by a strong dilation pulse occurring near, or even after, the initiation of liquefaction. Hall et al [15] examined the transient vibration characteristics of two 2 × 2 pile-group models based on the wavelet. They found that liquefaction causes a decrease in structural frequency, whose reduction depends on the rate of excess pore pressure build-up, whereby high rates ("fast liquefaction") lead to greater reduction, i.e.…”

Section: Characterisation Of Liquefaction Behaviourmentioning

confidence: 99%

The Dynamic Behaviour of Pile Foundations in Seismically Liquefiable Soils: Failure Mechanisms, Analysis, Re-Qualification

Rostami¹,

Hytiris²,

Bhattacharya³

2021

Earthquakes - From Tectonics to Buildings

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This chapter presents a concise overview of the mechanics of failure, analysis and requalification procedures of pile foundations in liquefiable soils during earthquakes. The aim is to build a strong conceptual and technical interpretation in order to gain insight into the mechanisms governing the failure of structures in liquefaction and specify effective requalification techniques. In this regard, several most common failure mechanisms of piles during seismic liquefaction such as bending (flexural), buckling instability and dynamic failure of the pile are introduced. Furthermore, the dynamic response commentary is provided by critically reviewing experimental investigations carried out using a shaking table and centrifuge modelling procedures. The emphasis is placed on delineating the concept of seismic design loads and important aspects of the dynamic behaviour of piles in liquefiable soils. In this context, using Winkler foundation approach with the proposed p–y curves and finite-element analyses in conjunction with numerical analysis methods, are outlined. Moreover, the feasibility of successful remediation techniques for earthquake resistance is briefly reviewed in light of the pile behaviour and failure. Finally, practical recommendations for achieving enhanced resistance of the seismic response of pile foundation in liquefiable soil are provided.

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2D Coupled Poro-Elastic Analysis for Dynamic Behaviour of CPRF

RamaRaju

Emani

Kothari

2020

Lecture Notes in Civil Engineering

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Identification of transient vibration characteristics of pile-group models during liquefaction using wavelet transform

Cited by 17 publications

References 34 publications

Physical Modelling of Offshore Wind Turbine Foundations for TRL (Technology Readiness Level) Studies

Physical Modelling of Offshore Wind Turbine Foundations for TRL (Technology Readiness Level) Studies

The Dynamic Behaviour of Pile Foundations in Seismically Liquefiable Soils: Failure Mechanisms, Analysis, Re-Qualification

2D Coupled Poro-Elastic Analysis for Dynamic Behaviour of CPRF

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