A comparison of initial stiffness formulations for small-strain soil–pile dynamic Winkler modelling

Prendergast, Luke J.; Gavin, Kenneth

doi:10.1016/j.soildyn.2015.11.006

Cited by 61 publications

(47 citation statements)

References 27 publications

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“…x 1 and x 2 are the first and second circular frequencies of the system (rad s -1 ) and n 1 ¼ n 2 ¼ n is the damping ratio adopted. All simulations in this paper are undertaken with a damping ratio of 2% to simulate energy dissipation from the system, which is broadly in keeping with the expected value for lightly damped structures and is broadly in line with the results obtained from pile tests presented in [26].…”

Section: Bridge Structural Modellingsupporting

confidence: 57%

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Isolating the location of scour-induced stiffness loss in bridges using local modal behaviour

Prendergast

Gavin

Hester

2017

J Civil Struct Health Monit

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Detecting scour by analysing bridge vibrations is receiving an increasing amount of attention in the literature. Others have considered changes in natural frequency to indicate the presence of scour damage; however, little work has been reported on identifying the location of a scour hole based on vibration measurements. In this paper, a numerical study is carried out using a bespoke vehiclebridge-soil dynamic interaction model to examine how the first six vibration modes (Eigen frequencies) of a typical integral bridge are affected by scour at different locations. It is found that depending on the location of the scour hole, some modes are much more affected than others in terms of frequency changes. In fact, a clear pattern emerges as to which modes are affected by which scour location. Using this knowledge, the location of a scour hole can potentially be detected on a real bridge. However, recognising that it is not possible to undertake an eigenvalue analysis on an actual bridge, an analysis is performed by collecting acceleration signals from various points on the structure. The bridge is loaded by a realistic vehicle model, incorporating vehicle-bridge interaction effects, which leads to the generation of discrete acceleration signals at various 'sensor' locations on the bridge. In this paper, it is found that it is possible to detect the location of a scour hole using a relatively small number of 'sensors'. However, to achieve this, careful signal processing is necessary and advice on a number of pertinent issues is provided.

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Section: Bridge Structural Modellingsupporting

confidence: 57%

“…2. The soil surrounding the foundation piles is modelled using a system of discrete, mutually independent, closely spaced spring elements, known as Winkler springs [13,[24][25][26]. Each spring has 2-DOFs and permits 1-D movement only along the spring axis.…”

Section: Bridge Structural Modellingmentioning

confidence: 99%

Isolating the location of scour-induced stiffness loss in bridges using local modal behaviour

Prendergast

Gavin

Hester

2017

J Civil Struct Health Monit

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“…and is arguably the most challenging aspect (Prendergast and Gavin, 2016;Wu et al, 2018). Traditional 92 approaches for predicting SRD such as Stevens et al (1982), Toolan and Fox (1977), and Semple and 93 Gemeinhardt (1981) are largely empirical and therefore, extrapolation to pile geometries and soil 94 conditions outside of the dataset on which they are based is highly questionable.…”

Section: Introduction 71mentioning

confidence: 99%

Performance of CPT-based methods to assess monopile driveability in North Sea sands

et al. 2018

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53Offshore pile driving is a high-risk activity as delays can be financially punitive. Experience of pile 54 driving for offshore jacket structures where pile diameters are typically < 2m has led to the development 55 of empirical pile driveability models with proven predictive capability. The application of these 56 methods to larger diameter piles is uncertain. A major component of driveability models involves 57 estimating the static resistance to driving, SRD, a parameter analogous to pile axial capacity. Recent 58 research on axial capacity design has led to improved models that use Cone Penetration Test, CPT data 59 to estimate pile capacity and include for the effects of friction fatigue and soil plugging. The 60 applicability of these methods to estimating pile driveability for larger diameter piles is of interest. In 61 this paper, recent CPT based axial capacity approaches, modified for mobilised base resistance and 62 ageing, are applied to estimating driveability of 4.2m diameter piles. A database of pile installation 63 records from North sea installations are used to benchmark the methods. Accounting for factors such 64as pile ageing and the relatively low displacement mobilised during individual hammer blows improves 65 the quality of prediction of pile driveability for the conditions evaluated in this study. 66 67

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“…Prendergast and Gavin [11] treated a buried pipeline as a short beam on an elastic foundation and analyzed its additional stress distribution.…”

Section: State Of the Artmentioning

confidence: 99%

Additional Stress on a Buried Pipeline under the Influence of Coal Mining Subsidence

Zhang

Lin

et al. 2018

Advances in Civil Engineering

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Buried pipelines influenced by coal mining subsidence will deform and generate additional stress during surface deformation. On the basis of the coordinating deformation relationship between buried pipeline and its surrounding soils, a stress analysis method of a buried pipeline induced by mining was proposed. e buried pipeline additional stresses were analyzed; meanwhile, a corresponding analysis process of the pipeline stresses was also presented during mining subsidence. Furthermore, based on the ground subsidence along the pipeline predicted in advance by the probability integral method, the additional stresses and Von Mises equivalent stresses and their distributions along the buried pipeline induced by the exploitation of a coal mining working face named 14101 were obtained. Meanwhile, a comparative analysis of additional stresses between simulation and analytical calculation was performed for the deep analysis and reliability of the results presented by the proposed methodology in this paper. e proposed method provides references for analysis of the additional stress and safety of buried pipelines under the influence of mining subsidence.

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A comparison of initial stiffness formulations for small-strain soil–pile dynamic Winkler modelling

Cited by 61 publications

References 27 publications

Isolating the location of scour-induced stiffness loss in bridges using local modal behaviour

Isolating the location of scour-induced stiffness loss in bridges using local modal behaviour

Performance of CPT-based methods to assess monopile driveability in North Sea sands

Additional Stress on a Buried Pipeline under the Influence of Coal Mining Subsidence

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