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Batch 06 Agent 1 -- Literature Synthesis (positions 1001--1040)

Generated: 2026-04-17

Individual Paper Summaries

# Author(s) Year Title Core Finding Method Tags
1 Senders 2008 Suction Caissons in Sand as Tripod Foundations for OWT Suction caissons beneath tripods are cheaper than monopiles in steel and installation; centrifuge tests and numerical modelling characterise installation and loading in dense sand Centrifuge testing; numerical modelling suction-caisson, tripod, sand, installation, centrifuge
2 Martakis et al. 2016 Centrifuge study on SSI effects on SDOF system SSI modifies SDOF dynamic response; centrifuge tests at ETH quantify period elongation and damping increase due to soil compliance Centrifuge testing; SDOF system identification SSI, centrifuge, SDOF, natural-frequency
3 Martakis et al. 2017 Centrifuge-based experimental verification of SSI effects Experimentally verified SSI-induced frequency reduction and added damping using centrifuge; validated analytical SSI models against physical data Centrifuge testing; analytical SSI modelling SSI, centrifuge, verification, soil-dynamics
4-5 McAdam et al. 2023 Monopile Foundation Stiffness Estimation through Model Updating PISA method predicts foundation stiffness much closer to field-monitored values than legacy API/DNVGL p-y; OMA + model updating extracts seabed-level rotational and lateral stiffness OMA (SSI method); FE model updating; field monitoring monopile, SHM, model-updating, PISA, OMA
6-7 Moynihan et al. 2023 System identification and FE model updating of 6 MW OWT Deterministic and Bayesian model updating both successfully calibrate soil-spring stiffness using vibration data; Bayesian approach quantifies parameter uncertainty System identification; deterministic and Bayesian model updating; strain + accelerometer instrumentation OWT, model-updating, Bayesian, SHM, digital-twin
8 Mozaffari et al. 2024 Extended Winkler Model for large-diameter monopiles Extended Winkler model incorporating rigid rotation via conventional p-y and t-z curves matches PISA predictions and experimental data for large-diameter piles Extended Winkler model; comparison with PISA monopile, large-diameter, Winkler, p-y, PISA
9 Ngo et al. 2022 Seismic Fragility of Novel Suction Bucket Foundation under Scour Novel multi-bucket SB foundation outperforms conventional tripod SB in bearing capacity despite smaller size; scour significantly shifts dynamic response and increases fragility Numerical analysis; seismic fragility curves; scour parametric study suction-bucket, seismic, fragility, scour, OWT
10 Nguyen-Sy & Houlsby 2005 Theoretical modelling of suction caisson using hyperplasticity Macro-element model with multiple yield surfaces captures cyclic hysteresis of caisson foundations; thermodynamic framework (hyperplasticity) provides rigorous constitutive basis Hyperplasticity theory; macro-element modelling suction-caisson, hyperplasticity, cyclic, macro-element
11 Nielsen et al. 2017 Response of Cyclic-Loaded Bucket Foundations in Saturated Dense Sand Under partly drained conditions at 1 Hz loading, two-way loading produces largest rotations (contrary to drained findings); calibrated LeBlanc model and cyclic load response diagram for predesign Small-scale model testing; 1 Hz cyclic loading in saturated dense sand bucket-foundation, cyclic, rotation, drainage, sand
12 Noppe 2019 Performance Monitoring and Lifetime Assessment of OWF Based on SCADA Data SCADA-based methods enable continuous performance monitoring and fatigue lifetime assessment without dedicated instrumentation SCADA data analysis; fatigue assessment SCADA, monitoring, fatigue, lifetime, OWF
13,15 OWA 2019 Suction Installed Caisson Foundations for Offshore Wind: Design Guidelines Comprehensive industry guidelines covering ULS, SLS, FLS, ALS limit states for suction caisson design in offshore wind Design guideline; limit state framework suction-caisson, design-guideline, OWA, limit-states
14 Camp et al. (OWTES) 2004 Design Methods for OWT at Exposed Sites EU project final report establishing integrated design methods for OWT at exposed (high wind/wave) sites; multi-partner collaboration (GH, TU Delft, GL, Vestas) Multi-disciplinary design framework; EU project design-methods, exposed-sites, OWT, EU-project
16 O'Reilly 2019 Engineering Dynamics: A Primer (3rd ed.) Textbook providing theoretical background for undergraduate dynamics: particle, rigid body, Lagrangian mechanics Textbook / primer dynamics, textbook, reference
17 Oztoprak & Bolton 2013 Stiffness of sands through a laboratory test database Modified hyperbolic G/G0 degradation curve from 454 tests; three parameters (elastic threshold strain, reference strain, curvature); predictions accurate within factor 1.13 for 3860 data points Database of 454 lab tests; statistical curve fitting sand-stiffness, G/G0, degradation, small-strain, database
18,24 Prendergast et al. 2013 Changes in natural frequency of a pile affected by scour Clear reduction in pile natural frequency with increasing scour depth; spring-beam FE model using small-strain stiffness accurately predicts frequency for given scour Laboratory + field testing; spring-beam FE model scour, pile, natural-frequency, vibration, SHM
19 Prendergast & Gavin 2014 A review of bridge scour monitoring techniques Critical review of scour monitoring: underwater instruments vs. vibration-based methods; vibration approaches offer promise but sensitivity analysis needed Literature review; sensitivity study scour, monitoring, bridge, review, vibration
20 Prendergast et al. 2015 Effect of scour on natural frequency of an OWT Monopiles in loose sand exhibit largest relative frequency reductions from scour; spring-beam FE with small-strain stiffness captures scale-test results Scale model test; spring-beam FE; soil density parametric scour, OWT, monopile, natural-frequency, sand-density
21 Prendergast et al. 2016a Determining scour around bridge foundations using vehicle-induced vibrations Vehicle-induced vibrations can detect scour presence; frequency shift observable from acceleration signals under traffic loading Vehicle-bridge interaction model; field acceleration scour, bridge, vehicle-vibration, SHM, frequency
22 Prendergast et al. 2016b Sensitivity Studies on Scour Detection Using Vibration-based Systems Sensitivity analysis of vibration-based scour detection; evaluates factors affecting detection reliability Numerical sensitivity study scour, sensitivity, vibration, bridge, SHM
23 Prendergast et al. 2017 Isolating location of scour-induced stiffness loss using local modal behaviour Different scour locations affect different vibration modes; pattern allows localization of scour hole using a small number of sensors Vehicle-bridge-soil interaction model; modal analysis scour, localization, modal-analysis, bridge, SHM
25 Q. Li et al. 2024 Beneficial effect of scour protection on lateral behaviour of monopiles Scour protection (width 2D, 30 kPa overburden) reduces lateral displacement by up to 41%; envelope diagram proposed for design considering scour protection Centrifuge tests; FE analysis; parametric study monopile, scour-protection, lateral-loading, centrifuge
26 Qi et al. 2016 Scour effects on p-y curves for shallowly embedded piles in sand Local scour yields stiffer p-y response than general scour at same depth below scour base due to overconsolidation effects; effective soil depth concept introduced Centrifuge testing (1:250); p-y curve derivation scour, p-y, centrifuge, local-vs-general, sand
27 Qi & Gao 2019 Local scour around monopile and scour effects on structural responses Review chapter: scour mechanisms (horseshoe vortex), time-scale prediction, scale effects, and scour impacts on stiffness, natural frequency, and fatigue life Review / book chapter scour, monopile, mechanism, horseshoe-vortex, review
28 CGO (Korean) 2024 15 MW Jacket Substructure T&I Cost Reduction Korean R&D project on cost reduction for transportation and installation of 15 MW jacket substructures using suction pile technology adapted from European pre-piling methods Industry R&D; cost analysis jacket, 15MW, suction-pile, Korean, installation-cost
29 Rezaei et al. 2018 Fatigue life sensitivity of monopile-supported OWT to damping Fatigue life is highly sensitive to damping; soil damping ratios range 0.17--1.3% of critical; supplemental damping devices could yield significant cost savings Time-domain FE simulation; nonlinear p-y curves; fatigue analysis fatigue, damping, monopile, OWT, soil-damping
30 McAdam 2011 Technical Feasibility of the Transverse Horizontal Axis Water Turbine (thesis) THAWT tidal device feasibility established; structural fatigue dominates over hydrodynamic considerations at full scale 1/20 scale experiments; Navier-Stokes blade element model; beam FE tidal-turbine, THAWT, feasibility, fatigue
31 Roth & Grigoriu 2010 Response sensitivity analysis in earthquake engineering Sensitivity analysis methods for structural response under seismic loading; framework for reliability-based design Structural sensitivity analysis; probabilistic methods sensitivity, earthquake, structural-dynamics, reliability
32 KOCED 0001-7251 2018 Standard test method for dynamic characterization of beam/girder members Korean standard for evaluating dynamic properties (natural frequency, damping, mode shapes) of beam or girder members Standard test procedure; impact/ambient vibration Korean-standard, dynamic-testing, beam, modal
33 KOCED 0013-7411 2021 Compaction method for sand ground models in geotechnical centrifuge testing Korean standard for preparing sand ground models in centrifuge tests via compaction Centrifuge specimen preparation standard Korean-standard, centrifuge, sand, compaction
34 KOCED 0021-xxxx 2020 Miniature cone method for dry sand property evaluation Korean standard for evaluating mechanical properties of dry sand using miniature cone penetration in centrifuge Miniature CPT standard Korean-standard, CPT, sand, centrifuge
35 KOCED 0048-7586 2023 Debris flow impact force and propagation velocity measurement using inclined flume Korean standard for measuring debris flow parameters in inclined flume facilities Inclined flume test standard Korean-standard, debris-flow, flume
36 KOCED 0005-7383 2019 Air pluviation test method for sand ground preparation Korean standard for preparing sand specimens by air pluviation (raining) Air pluviation standard Korean-standard, air-pluviation, sand
37 KOCED 0029 2020 Bender element shear wave velocity measurement in centrifuge Korean standard for measuring shear wave velocity using bender elements during centrifuge model tests Bender element standard in centrifuge Korean-standard, bender-element, Vs, centrifuge
38 KOCED 0007-7419 2021 Shaking table test method for seismic performance of suspended ceilings Korean standard for evaluating seismic performance of suspended ceiling systems using shaking table Shaking table test standard Korean-standard, seismic, ceiling, shaking-table
39 Seo et al. 2020 Dynamic Characteristics of OWT with Tripod Suction Buckets via Full-Scale Testing Suction bucket cap stiffness and soil strain dependency are critical for accurate natural frequency prediction; strain measurement more robust than acceleration for characterizing low-frequency OWT dynamics Full-scale testing; FE analysis with strain-dependent soil tripod, suction-bucket, full-scale, dynamic, strain
40 Seong & Kim 2018 Seismic evaluation of OWT by geotechnical centrifuge test Centrifuge experiments with earthquake input provide reliable SFSI data for OWT; three case studies evaluate seismic response of monopile-supported OWT Geotechnical centrifuge with earthquake simulator seismic, centrifuge, OWT, SFSI, KAIST

Synthesis

CONSENSUS

  1. Scour reduces foundation stiffness and natural frequency. Every scour-related paper in this batch (Prendergast 2013/2015/2016/2017, Qi 2016/2019, Li 2024, Ngo 2022) converges on the finding that scour lowers the natural frequency of pile/bucket foundations, with the magnitude depending on soil density, scour geometry (local vs. general), and foundation type.

  2. Legacy p-y methods underestimate monopile stiffness; PISA is more accurate. Both McAdam et al. (2023) and Mozaffari et al. (2024) confirm that API/DNVGL p-y approaches systematically under-predict the stiffness of large-diameter monopiles, while PISA-based and extended Winkler formulations align much better with field and experimental data.

  3. Vibration-based SHM is viable for scour and foundation condition monitoring. Multiple independent groups (Prendergast, McAdam, Moynihan, Seo) demonstrate that operational modal analysis combined with model updating can track foundation stiffness changes from field data.

  4. Centrifuge testing is a validated tool for SSI and foundation behaviour. Papers from ETH (Martakis), KAIST (Seong & Kim), UWA (Senders, Qi), Aalborg (Nielsen), and Delft/Nottingham (Li) all use centrifuge modelling to study soil-foundation interaction, confirming its reliability for reproducing prototype-scale stress conditions.

  5. Damping is a critical yet uncertain parameter for OWT fatigue life. Rezaei et al. (2018) shows fatigue life is highly sensitive to damping, while soil damping values in the literature vary by nearly an order of magnitude (0.17--1.3% critical).

DEBATES

  1. Drained vs. undrained cyclic response of bucket foundations. Nielsen (2017) shows that two-way loading produces the largest rotation under partly drained conditions, contradicting earlier drained-condition findings where one-way loading dominated. The drainage regime fundamentally changes the governing load case.

  2. Local vs. general scour treatment in p-y methods. Qi et al. (2016) demonstrate that local scour leaves overconsolidation effects that make the soil stiffer than a simple mudline-lowering (general scour) assumption would predict. Whether design codes should distinguish these two cases remains under discussion.

  3. Deterministic vs. Bayesian model updating. Moynihan et al. (2023) compare both; deterministic updating gives precise fits but no uncertainty quantification, while Bayesian updating gives distributions that grow tighter with more data. The appropriate choice depends on whether parameter uncertainty propagation matters for the application.

  4. Strain vs. acceleration for OWT dynamic monitoring. Seo et al. (2020) argue that strain signals are more robust than acceleration for characterizing low-frequency OWT dynamics, but most SHM literature relies on accelerometers. The relative merits under operational conditions remain debated.

GAPS

  1. No unified scour-aware p-y framework. Despite consensus that scour alters p-y curves, no standardized code provision exists for local scour with overconsolidation effects. The effective-depth concept (Qi 2016) is promising but not yet codified.

  2. Limited full-scale validation of suction bucket dynamic models. Only Seo et al. (2020) provide full-scale dynamic data for tripod suction buckets. Most studies rely on centrifuge or small-scale models. Full-scale data are needed especially for cyclic and seismic loading.

  3. Scour + seismic combined hazard. Ngo et al. (2022) is one of very few studies addressing the combined effect. Fragility curves under coupled scour-seismic loading for different foundation types remain scarce.

  4. Soil damping quantification. Rezaei et al. (2018) highlight the wide range of reported soil damping values. No consensus procedure exists for measuring or predicting soil damping of monopile foundations in situ.

  5. Vibration-based scour localization at full scale. Prendergast (2017) shows localization is theoretically possible using modal patterns, but no full-scale field validation has been published.

METHODS

  • Centrifuge modelling is the dominant physical testing method (Senders, Martakis, Nielsen, Qi, Li, Seong & Kim), with scales ranging from 1:50 to 1:250.
  • Operational modal analysis (OMA) using SSI algorithms is the standard for extracting modal parameters from field data (McAdam, Moynihan).
  • FE model updating (deterministic and Bayesian) bridges the gap between numerical predictions and measured behaviour.
  • Spring-beam (p-y) models remain the workhorse for lateral pile analysis, with extensions for large-diameter effects (Mozaffari) and scour (Qi).
  • Macro-element modelling with hyperplasticity (Nguyen-Sy & Houlsby) provides a compact alternative to full 3D FE for cyclic caisson response.
  • KOCED standards codify centrifuge specimen preparation (air pluviation, compaction), in-situ characterization (miniature CPT, bender elements), and dynamic testing procedures for Korean research infrastructure.

BENCHMARKS

Benchmark Value Source
G/G0 prediction accuracy within factor 1.13 (1 SD, 3860 points) Oztoprak & Bolton (2013)
Monopile lateral displacement reduction from scour protection up to 41% (2D width, 30 kPa) Li et al. (2024)
Local scour depth S/D up to 1.5 Qi et al. (2016)
Soil damping ratio range for monopile OWT 0.17%--1.3% critical Rezaei et al. (2018)
Aerodynamic damping range (operational) 2%--8% critical Rezaei et al. (2018)
OWT parked damping (fore-aft) ~1% critical Rezaei et al. (2018)
Foundation cost share of total OWT investment 15%--40% Nguyen-Sy & Houlsby (2005)
Installed European OWT capacity (2018) 18,499 MW cumulative Seo et al. (2020)

Papers processed: 39 files (2 duplicates: McAdam 2023, Prendergast 2013; 2 duplicates: Moynihan 2023, OWA 2019). Unique works: ~33.