Literature Synthesis -- Batch 08 Agent 5 (Files 1561--1600)

Generated: 2026-04-17

Individual Summaries

#	Author(s)	Year	Title	Core Finding	Method	Tags
1	Korean Ministry (MOLIT)	2016	KDS 24 14 50: Bridge Substructure Design (General Method)	Unified Korean design code for abutments, piers, and foundations under allowable stress design	Code consolidation from prior road/rail standards	design-code, bridge, foundation, Korea
2	Korean Ministry (MOLIT)	2021	KDS 24 14 51: Bridge Substructure Design (Limit State Design)	LRFD-based reliability framework for spread footings, driven piles, drilled shafts, abutments, and retaining walls	Limit-state design with partial safety factors	LRFD, bridge, foundation, Korea
3	Korean Ministry (MOLIT)	2016	KDS 24 17 10: Bridge Seismic Design Standard	Seismic design provisions for Korean bridges, including ductility-based methods for RC piers	Seismic code; force-based and ductility-based approaches	seismic, bridge, design-code, Korea
4	Choi et al. (KIER)	2019	Wind System Reliability Improvement for Acceptance	Predictive maintenance and CMS needed to reduce O&M costs and downtime in offshore wind	Condition monitoring; remaining-life estimation	wind-turbine, reliability, predictive-maintenance, Korea
5	Kuhn M	2001	Dynamics and Design Optimisation of Offshore Wind Energy Conversion Systems (PhD Thesis, TU Delft)	Integrated dynamic analysis framework coupling aero-elastic and structural models for OWT design optimisation	Coupled aero-hydro-structural simulation	OWT, dynamics, design-optimisation, thesis
6	LeBlanc C	2009	Design of Offshore Wind Turbine Support Structures (PhD Thesis, Aalborg)	Geotechnical aspects of monopile design, including cyclic lateral loading and long-term accumulation effects in sand	Laboratory cyclic loading; p-y curves	monopile, geotechnical, cyclic-loading, thesis
7	Germanischer Lloyd	2013	GL IV-7-2: Structural Design of Offshore Substations	Certification rules covering environmental loads, fatigue, buckling, and dynamic analysis for offshore substations	Classification society standard	design-code, offshore-substation, fatigue, GL
8	Qi & Gao	2019	Local Scour around a Monopile Foundation for OWTs and Scour Effects on Structural Responses	Scour reduces monopile stiffness and natural frequency; current predictors have scale-effect limitations for large-diameter (up to 10 m) monopiles	Review + analytical; horseshoe vortex mechanics	scour, monopile, natural-frequency, scale-effect
9	Yu et al.	2015	Long-term Dynamic Behavior of Monopile Supported OWTs in Sand	Natural frequency of scaled OWT model increases with cycle count but at diminishing rate governed by shear-strain level	1-g scaled model tests; out-of-balance excitation	monopile, cyclic-loading, natural-frequency, long-term
10	Prendergast LJ	2015	Monitoring of Scour around Structures Using Changes in Natural Frequency (PhD Thesis, UCD)	Natural frequency shifts are a viable non-invasive scour indicator for pile-supported structures	Vibration monitoring; spring-beam FE models	scour-monitoring, natural-frequency, SHM, thesis
11	Zhang W	2020	MARS Applications in Geotechnical Engineering Systems (Book)	MARS (multivariate adaptive regression splines) outperforms neural networks in interpretability and efficiency for multi-variate geotechnical prediction	Data-driven regression; big-data geotechnics	machine-learning, MARS, geotechnical, surrogate-model
12	MMB Consortium	2020	MMB Support Structure Construction Specification (Rev 0)	Construction specification for an offshore wind support structure project in Korea, covering fabrication, survey, and QC	Industry specification document	construction-spec, offshore-wind, Korea
13	Kim KS et al.	2026	Double-Filter Framework for Physics-Informed Vibration-Based Scour Detection (MSSP submission)	Physics-informed RANSAC + CUSUM pipeline reduces EOV-induced frequency scatter by 70% and detects scour at 0.39D with 95% probability and zero false alarms	Field data (32 months, 4.2 MW tripod); regime-split regression; statistical control charts	scour-detection, SHM, EOV, physics-informed, field-data
14	El-Reedy MA	2014	Marine Structural Design Calculations (Book)	Comprehensive reference for offshore structural calculations including jacket, topside, and foundation design	Engineering handbook	offshore, structural-design, handbook
15	Whitehouse RJS	2004	Marine Scour at Large Foundations	Lab tests on 20-m-diameter composite monopile-caisson foundations show scour depth depends on caisson geometry; S/D up to 2 possible under combined waves and currents	Physical model testing; mobile-bed flume	scour, large-foundation, caisson, physical-model
16	Mayne PW & Poulos HG	1999	Approximate Displacement Influence Factors for Elastic Shallow Foundations	Simplified spreadsheet-based displacement influence factors for homogeneous-to-Gibson soil profiles, incorporating rigidity and embedment corrections	Elastic continuum; numerical integration	shallow-foundation, settlement, elastic-solution
17	Kulhawy FH & Mayne PW	1990	Manual on Estimating Soil Properties for Foundation Design (EPRI)	Comprehensive correlation database linking field/lab test indices (SPT, CPT, etc.) to engineering soil parameters	Empirical correlations; statistical review	soil-properties, correlations, SPT, CPT, manual
18	Whitehouse et al.	2008	An Assessment of Field Data for Scour at OWT Foundations	Field scour data from 5 UK wind-farm sites show S/D varies widely; clay layers can limit scour, while sandy sites reach S/D near DNV 1.3 guideline	Field monitoring; multi-site comparison	scour, field-data, OWT, monopile
19	Melville B	2008	The Physics of Local Scour at Bridge Piers	Lab scour depths may overestimate field scour; scour process depends on flow, sediment, pier geometry, and time	Dimensional analysis; literature synthesis	scour, bridge-pier, scale-effect, physics
20	den Boon et al.	~2005	Scour Behaviour and Scour Protection for Monopile Foundations of OWTs	Scour protection design guidance for monopiles; unprotected scour can reach S/D of 1.3+ in live-bed conditions	Physical model tests; scour protection evaluation	scour-protection, monopile, physical-model
21	Kim JH et al. (KAIST)	2015	Miniature Cone Tip Resistance on Sand in a Centrifuge	Particle-size effect negligible for 7-13 mm cones; tip resistance decreases at shallow depth with increasing g-level before merging at critical depth	Centrifuge CPT; modeling of models	centrifuge, CPT, cone-resistance, sand
22	Devriendt et al.	2014	Monitoring Resonant Frequencies and Damping Values of an OWT in Parked Conditions	First long-term OMA campaign on a Belgian OWT; automated SSI tracking shows damping ratios critical for fatigue life	Operational modal analysis; continuous monitoring	OMA, damping, natural-frequency, OWT, field-data
23	McAdam et al.	2023	Monopile Foundation Stiffness Estimation through Model Updating	Field-monitored OWT shows foundation stiffness significantly higher than API/DNVGL predictions; PISA method matches updated stiffness well	OMA + FE model updating; PISA calibration	monopile, stiffness, model-updating, PISA, SHM
24	Mostafa & El Naggar	2004	Response of Fixed Offshore Platforms to Wave and Current Loading Including SSI	Pile-soil-pile interaction and soil nonlinearity significantly affect dynamic response of jacket platforms	Dynamic p-y and t-z curves; FE (ASAS)	offshore-platform, SSI, pile-group, dynamic-response
25	NAFEMS	2013	BenchMark Magazine (October 2013)	Industry perspectives on CFD third wave, closing simulation gap, and FE modelling best practices	Magazine/editorial	FEM, CFD, benchmarking, best-practice
26	NAVFAC	2012	Handbook for Marine Geotechnical Engineering (SP-2209-OCN)	Updated comprehensive reference for marine geotechnical site characterisation, foundation design, and anchoring	Engineering handbook; US Navy practice	marine-geotech, handbook, NAVFAC, foundation
27	NAVFAC	1986	DM 7.01: Soil Mechanics	Classic US Navy design manual for soil mechanics fundamentals: classification, permeability, consolidation, shear strength	Design manual	soil-mechanics, design-manual, NAVFAC
28	NAVFAC	1986	DM 7.02: Foundations and Earth Structures	US Navy design manual for shallow/deep foundations, retaining structures, and excavations	Design manual	foundation, earth-structures, design-manual, NAVFAC
29	NAVFAC	1982	DM 7.2: Foundations and Earth Structures (original edition)	Earlier edition of DM 7.02 covering similar topics before 1986 revalidation	Design manual	foundation, design-manual, NAVFAC
30	NCHRP	~2009	Document 181: Evaluation of Bridge-Scour Research	Comprehensive evaluation of bridge-scour research state-of-practice and knowledge gaps	Literature review; research synthesis	bridge-scour, research-evaluation, NCHRP
31	NCHRP	2012	Report 717: Scour at Bridge Foundations on Rock	Methods for evaluating scour potential at rock-founded bridges; erodibility classification for rock masses	Field/lab testing; geologic assessment	scour, rock-foundation, bridge, erodibility
32	NCS (Korea)	2014	Geotechnical Design -- Stability Analysis (Learning Module)	Korean vocational training module covering stability analysis for spread footings, retaining walls, slopes, and soft ground	Educational/code-based	geotechnical, stability, Korea, education
33	Geraili Mikola & Sitar	2013	Seismic Earth Pressures on Retaining Structures in Cohesionless Soils	Mononobe-Okabe method overly conservative above 0.4 g; Seed-Whitman approximation recommended as upper bound	Centrifuge testing; FLAC 2D numerical simulation	seismic, earth-pressure, retaining-wall, centrifuge
34	NGI / Yu S	2022	Design Standard and Centrifuge Test for Transmission Tower Foundations (Technical Note)	LRFD resistance factors for inverted T-shape foundations derived from centrifuge model tests at NGI	Centrifuge testing; LRFD calibration	centrifuge, transmission-tower, LRFD, foundation
35	NIST (NEHRP)	2012	Soil-Structure Interaction for Building Structures (GCR 12-917-21)	Comprehensive SSI guidance: kinematic interaction, foundation damping, and impedance functions for seismic design	Analytical/numerical SSI methods	SSI, seismic, building, impedance-function
36	NORSOK	2012	N-001 Ed. 8: Integrity of Offshore Structures	Norwegian petroleum-industry standard for structural integrity covering loads, materials, fatigue, geotechnical design, and condition monitoring	Industry standard	design-code, offshore, NORSOK, integrity
37	Demirci et al.	2022	Liquefaction Effects on the Fundamental Frequency of Monopile-Supported OWTs	Liquefaction-induced loss of lateral support reduces natural frequency; LP/D ratio governs sensitivity; simplified spreadsheet method provided	Parametric FE study; analytical validation	liquefaction, natural-frequency, monopile, seismic
38	Sirnivas & Musial (NREL)	2014	Assessment of Offshore Wind System Design, Safety, and Operation Standards	Review and gap analysis of international OWT standards (IEC, DNV, GL, API) for US regulatory context	Standards comparison; gap analysis	OWT-standards, IEC, DNV, gap-analysis, NREL
39	Andersen et al.	2012	Natural Frequencies of Wind Turbines on Monopile Foundations in Clayey Soils -- A Probabilistic Approach	Stochastic p-y analysis in spatially variable clay shows that soil uncertainty can shift natural frequency outside the target band, raising fatigue risk	Random-field; asymptotic sampling; nonlinear p-y	natural-frequency, probabilistic, clay, monopile
40	Hoffmans & Verheij	2021	Scour Manual -- Current-Related Erosion (2nd ed.)	Authoritative Dutch reference for scour prediction: equilibrium depth, time development, and protection design around hydraulic structures	Empirical and semi-empirical predictors; design charts	scour-manual, erosion, Deltares, design-guide

Synthesis

CONSENSUS

1. Foundation stiffness is systematically underestimated by legacy codes. Multiple sources (McAdam 2023, Qi & Gao 2019, Andersen 2012, Demirci 2022) converge on the finding that API/DNVGL p-y methods underpredict monopile lateral stiffness. The PISA method and field-updated models consistently show higher stiffness than design-phase estimates. This has direct implications for natural-frequency placement and remaining-life assessment.

2. Natural frequency is the critical design and monitoring parameter for OWTs. Virtually every OWT-focused paper in this batch (Kuhn 2001, LeBlanc 2009, Yu 2015, Devriendt 2014, Andersen 2012, Demirci 2022, Prendergast 2015, Kim 2026, McAdam 2023) treats the first natural frequency as the primary quantity of interest. The 1P/3P avoidance constraint and fatigue-life sensitivity to frequency shifts are universally acknowledged.

3. Scour reduces effective embedment, stiffness, and natural frequency. All scour-related references agree that local scour lowers the fundamental frequency of monopile-supported structures and increases fatigue damage. The DNV rule-of-thumb S/D = 1.3 is widely cited as a conservative upper bound for monopiles in sandy seabeds under current-dominated conditions.

4. Scale effects complicate laboratory-to-field extrapolation. Melville (2008), Qi & Gao (2019), Kim JH (2015, centrifuge CPT), and Whitehouse (2004) all highlight that laboratory-scale scour depths and soil resistance often do not directly transfer to prototype conditions without correction.

DEBATES

1. Adequacy of empirical scour predictors for large-diameter monopiles. Qi & Gao (2019) and Whitehouse (2004, 2008) note that existing scour equations were calibrated on slender piles (D < 2 m) and may not apply to modern monopiles with D = 6--10 m. Whether wave-dominated or current-dominated conditions control equilibrium scour at large diameters remains unresolved.

2. Black-box vs. physics-informed EOV filtering for SHM. Kim et al. (2026, MSSP) argue that unconstrained data-driven models (e.g., PCA) suffer from "damage leakage" where structural degradation is normalized away with environmental variability. Whether physics-informed decomposition universally outperforms purely statistical approaches across different foundation types and environmental regimes is still contested.

3. Deterministic vs. probabilistic foundation design. Andersen et al. (2012) demonstrate that deterministic p-y design may miss the tail risk of unfavorable soil configurations. The Korean codes (KDS 24 14 51) and the NGI technical note adopt LRFD frameworks, but calibration of resistance factors remains site- and load-specific, with no universal consensus on target reliability indices for OWT foundations.

GAPS

1. Long-term field validation of scour--frequency coupling. Despite consensus that scour lowers natural frequency, multi-year field datasets linking measured scour progression to tracked frequency shifts are scarce. The Kim et al. (2026) 32-month dataset is one of the few; more sites and foundation types are needed.

2. Combined hazard assessment (scour + seismic + cyclic degradation). Demirci et al. (2022) address liquefaction effects on frequency, and Yu et al. (2015) address cyclic stiffening in sand, but no source in this batch integrates scour, seismic liquefaction, and long-term cyclic loading into a unified reliability framework.

3. Scour prediction and monitoring for non-monopile foundations. Nearly all scour research focuses on cylindrical monopiles. Whitehouse (2004) tested composite caisson--monopile geometries, but tripod, jacket, and suction-bucket foundations lack validated scour models and field calibration data.

4. Standardised EOV correction benchmarks. The SHM community lacks a shared benchmark dataset for comparing EOV-removal methods across sites. Each group validates on its own field or synthetic data, hindering reproducible comparison.

METHODS

Method	Used By	Domain
Operational Modal Analysis (OMA/SSI)	Devriendt 2014, McAdam 2023, Kim 2026	SHM / frequency tracking
FE model updating	McAdam 2023	Foundation stiffness back-calculation
Nonlinear p-y / t-z curves	Andersen 2012, Mostafa 2004, McAdam 2023	Pile--soil interaction
PISA design method	McAdam 2023	Large-diameter monopile design
Centrifuge physical modelling	Kim JH 2015, Geraili Mikola 2013, NGI 2022	Soil--structure, scour, seismic
Mobile-bed flume tests	Whitehouse 2004, den Boon 2005	Scour process and protection
RANSAC + CUSUM (physics-informed)	Kim 2026	Scour detection under EOV
MARS / machine learning	Zhang 2020	Geotechnical surrogate modelling
Random-field stochastic analysis	Andersen 2012	Probabilistic natural frequency
Dimensional analysis / similitude	Melville 2008, Yu 2015	Scour and dynamic scaling

BENCHMARKS

Benchmark / Reference Value	Source
S/D = 1.3 (design scour depth for monopiles in currents)	DNV, cited by Whitehouse 2008
S/D up to 2.0 (live-bed combined waves + currents)	Whitehouse 2004
1P / 3P frequency avoidance band	Kuhn 2001, Demirci 2022, NREL 2014
NREL 5 MW reference turbine properties	Demirci 2022, NREL 2014
PISA vs. API p-y stiffness ratio	McAdam 2023
0.39D scour detection threshold at 95% POD	Kim et al. 2026
70% residual scatter reduction (Double-Filter)	Kim et al. 2026
Mononobe-Okabe conservatism above 0.4 g	Geraili Mikola & Sitar 2013
LP/D as governing ratio for liquefaction sensitivity	Demirci et al. 2022