R&D for OWT Foundation Design
|
|
- Lily Austin
- 5 years ago
- Views:
Transcription
1 R&D for OWT Foundation Design Geotechnical Engineering for Offshore Wind Infrastructure Workshop organized by HDEC and NGI Shanghai, China, 31 May, 2018 Youhu Zhang, PhD Technical Lead Offshore Geotechnics, NGI
2 Agenda Introduction Current research topics Partial drainage Robust foundation models for fatigue assessment Soil reaction curves for monopiles Loads on offshore wind turbines and effect of irregular cyclic loading Frontier and challenges Ground model and artificial intelligence Long term deformation of offshore wind turbine foundations Reliability based design Specific challenges in China Opportunities for collaboration NGI-China
3 Introduction: research and development at NGI NGI is a Research Institute 75% of the staff hold a MSc degree or above (26% hold a PhD) NGI receives an annual base funding from Research Council of Norway (RCN), which are used to fund small scale research projects (GBV) that everyone at NGI can apply and also larger multi-year strategic projects. NGI is actively involved in research projects funded through national, EU and other international funding bodies NGI carries out numerous industry sponsored research, such as jointindustry-projects (JIPs) NGI Strategy 2018 to 2021 World class research, development and innovation. At least 15% of revenue from research Technology for the future
4 Introduction: OWT and its foundations OWTs are light-weight and slender structures Low vertical load, large horizontal and overturning moment Dynamic sensitive structures under different excitation sources Foundation stiffness must be engineered precisely. Soil damping has an important impact on structural fatigue life Fatigue can often be the design driver Stringent serviceability limit Accumulated displacement/rotation after extreme loading event or during life time operation should be constrained to certain limits Mass production: large number of OWTs in a wind farm Requires efficient and streamlined design approaches.
5 Partial drainage General background Cyclic loading on OWT foundations at almost all time due to environmental loading and structural vibrations In sandy soils, drainage occurs simultaneously with generation of excess pore pressure, and even during a single load cycle Strength and stiffness of the soil is heavily dependent on the drainage condition during shearing Is accumulated pore pressure a good memory of cyclic effect? A big focus at NGI in the past few years Work carried out through an NGI internal strategic research project,
6 Partial drainage In-situ permeability measurement tool Permeability is a key input parameter for foundation design in sandy soils Difficult to obtain undisturbed sand samples In-situ measurement of the permeability is preferred An in-situ testing tool is developed at NGI, which features: A conventional CPT set-up, but with a filter section above the cone Pumping water in or out under constant pressure head through a plunger actuator In-situ permeability back-figured through design charts established by finite element analyses A conceptual illustration of an in-situ permeability measurement device under development at NGI
7 Partial drainage Laboratory triaxial testing with different level of drainage Mechanical behaviour of soil, in general, depends on the drainage condition when it is sheared. Particularly relevant for silty to sandy soils as the soil response under cyclic loading can be either drained, partially drained or fully undrained during a single load cycle A special laboratory triaxial test setup is developed at NGI to carry out tests under partial drainage in a controlled manner. undrained drained Five triaxial compression tests under varying degrees of drainage during shearing
8 Partial drainage Drainage criterion for monopiles in sand Normalised excess pore pressure at peak load, P Pile T p = t p c v 2 D Tp=48.5 (drained) Tp=24.3 Tp=9.7 Tp=4.9 Tp=2.4 Tp=1 Tp=0.5 Tp=0.05 (undrained) Normalised distance, L/D Dr. Shuzhao Li from CNOOC Research Institute carried out this work during her visit to NGI in 2017 Need a convenient criterion to establish the drainage condition under cyclic loading for monopile design For typical monopile size (5-10 m in diameter), essentially undrained soil response is expected during a single load cycle State-of-practice for monopiles in sand use p-y curves that were developed for drained soil response. This differs from the underlying assumptions for the p-y curves used for design, but what is the implications?
9 Partial drainage Drainage criterion for monopiles in sand Horizontal force, MN Horizontal force, MN Undrained 20 Tp= Tp= Tp= Tp= Tp=9 300 Tp=18 5 Tp= Drained Horizontal displacement at mudline, m D=6m L=30m D r =80% D=6m L=30m D r =80% 5 Drained 150 Undrained Rotation at mudline, Overturning moment at mudline, MNm Overturning moment at mudline, MNm Stiffer global load displacement/ration response with undrained conditions at high load levels than drained conditions due to dilation However, monopiles are designed with stringent SLS limit. DNV GL (2016) suggest to limit the mudline rotation due to environmental loading to 0.25, in addition to an installation tolerance of Within the rotation limit, almost identical global pile response between drained and undrained. Implication for practical design is insignificant.
10 Partial drainage Vertical pull-out capacity of suction bucket OWT has a light weight, but large environmental loading For a multipod jacket structure supporting an OWT, the windward leg can be subjected to tension loading during operation and extreme loading event Holding capacity is a function of loading rate Dr. Kanmin Shen, formerly Zhejiang University, now Huadong, visited NGI in 2016 and investigated the rate effect on holding capacity of suction buckets A advanced two surface plasticity model SANISAND was used in the simulation Shen et al. (2017) SUT
11 Partial drainage Vertical pull-out capacity of suction bucket
12 Robust foundation models for fatigue assessment General background Unsteady aerodynamic effects OWTs are dynamically sensitive structures Fatigue is often a design-driver Complex aero-hydro-servo-elastic modelling Time-domain simulations due to non-linearities Worked carried out at NGI in the last four years through a large project REDWIN sponsored by the RCN and industrial partners (Statoil, Vattenfall, NGI, IFE, NTNU, OlavOlsen) 1.5 M over four years Turbulent wind Current Irregular waves Soil-pile interaction
13 Robust foundation models for fatigue assessment Modelling approach Macro-element models
14 Robust foundation models for fatigue assessment Macro-element concept Provides load-displacement response of the foundation + soil at one interface point Different stiffness after load reversal Based on multi-surface plasticity Includes coupling between loads (similar to interaction diagrams) Hysteretic foundation damping
15 Robust foundation models for fatigue assessment REDWIN models - Flexible piles Foundation and substructre Model applicable Loading regime Redwin model 1 p, y p Soil support model y Redwin model 2 Distributed 1D model to be applied to any DOF. HM-loading Redwin model 3 VHM-loading Redwin model 3 1D p-y model with hysteretic damping Foundation structure interface VHM-loading V M H u θ u v u h Foundation model
16 Robust foundation models for fatigue assessment REDWIN models - Monopiles Foundation and substructre Model applicable Loading regime Redwin model 1 p, y p Soil support model y Redwin model 2 Distributed 1D model to be applied to any DOF. HM-loading Redwin model 3 VHM-loading Redwin model 3 Includes the coupling between x- and y-directions V M H u θ u v Foundation structure interface Foundation model u h VHM-loading
17 Robust foundation models for fatigue assessment REDWIN models gravity-based foundations Foundation and substructre Model applicable Loading regime Redwin model 1 p, y p Soil support model y Redwin model 2 Distributed 1D model to be applied to any DOF. HM-loading Redwin model 3 VHM-loading Redwin model 3 Foundation structure interface VHM-loading Includes the effect of the vertical load V M H u θ u v u h Foundation model
18 Robust foundation models for fatigue assessment REDWIN models bucket foundations Foundation and substructre Model applicable Loading regime Redwin model 1 p, y p Soil support model y Redwin model 2 Distributed 1D model to be applied to any DOF. HM-loading Redwin model 3 VHM-loading Redwin model 3 Foundation structure interface VHM-loading Includes the effect of the vertical load V M H u θ u v u h Foundation model
19 Robust foundation models for fatigue assessment Validation Natural frequencies Fatigue Damage Equivalent Loads
20 Robust foundation models for fatigue assessment Validation Natural frequencies Design prediction range Normlized PSD Revised analyses with Redwin model 2 (for monopiles) 1E f / f n,measured
21 Robust foundation models for fatigue assessment Validation Fatigue REDWIN Damage models Equivalent calibrated Loads to FEA (DEL) Simulated DEL Measured DEL agree well REDWIN with measured model 2 natural API p-y curves frequencies and DEL Difference 7 % is foundation damping 93 % is foundation stiffness
22 p-y curves for monopile design General background State-of-practice for monopile design uses p-y curves that were developed for conventional slender piles used for the oil and gas industry Monopiles: large diameter, small L/D ratio Lateral response dominated by the wedge mechanism The flow-around mechanism may not be relevant at all Pile tip resistance is important Possibly also the vertical skin frictions Calls for new models for monopile design Lateral loading Wedge Flow around Soil mechanism for a slender pile under lateral loading
23 p-y curves for monopile design General background The PISA project: 1) The PISA project is a large joint industry project 2) Large scale model testing in both clay and sand 3) Numerical simulations 4) The model provides a good framework for modelling the monopile response 5) Requires site specific numerical simulation to calibrate the model At NGI, work is also performed to develop a model that has a Byrne et al. (2017) OSIG SUT conference similar framework to PISA, but fundamentally based on soil stress-strain behaviour measured directly in lab testing.
24 p-y curves for monopile design NGI model: ingredient 1: p-y curves for wedge failure 20D Analysis 1 p Analysis 2 Analysis 1 y p Analysis 2 Difference between analyses 1 and 2 y D Horizontal translating 10D
25 p-y curves for monopile design NGI model: ingredient 2: base shear spring 20D 5D footing 10D 2.5D L tip 2.5D 20D 10D Step 1 Step 2
26 p-y curves for monopile design Validation Some observations: 1) At very low load levels, the monopile exhibit flexible/semi-rigid pile behaviour, i.e. large proportion of steel deformation 2) At high load levels, the monopile exhibit rigid pile behaviour, little steel deformation 3) Soil mechanism divided into two zones: a y m /D = 0.2% y m /D = 31% wedge failure in the upper part and a rotational mechanism at lower part Essentially replace the scoop failure surface with a flat base shear plane 4) Sufficient to consider the base shear only as the rotation centre way above the pile tip. Base rotational moment negligible.
27 p-y curves for monopile design Conceptual model for application External loading 1) Above the rotation point, p-y curves for wedge failure. 2) Below the rotation point, where the pile Tension gap p-y curves for wedge mechanism kicks back, soil on both sides of the pile is forced to be engaged. Flow-around p-y curves. 3) At the pile tip, the base shear S-u model Rotation point S-u curve for pile tip p-y curves for flow-around mechanism
28 p-y curves for monopile design Example validation results D = 6 m Depth below mudline, m , 2473, 5569 kn Mudline Depth below mudline, m , 2473, 5569 kn Mudline Depth=30m Load eccentricity: 30 m above ground 20 Solid curve: FEA Dashed curve: Beam-column model Lateral displacement, m Bending moment, knm s u = 100 kpa
29 p-y curves for monopile design Laboratory p-y testing apparatus
30 p-y curves for monopile design Laboratory p-y testing apparatus
31 p-y curves for monopile design Laboratory p-y testing apparatus Norm. secant stiffness at steady state K sec,norm UB BF LB Test 1 Test 2 Test 3 Test 4 Test 5 Normalized damping ratio D norm Test 1 Test 2 Test 3 Test 4 Test 5 Damping Norm. lateral displacement ( y/d) Norm. lateral displacement ( y/d) Normalized stead-state stiffness Normalized steady state damping ratio
32 Tp, s Loads on offshore wind turbines and effect of irregular cyclic loading General background The size of offshore wind turbines is increasing Requires larger foundations There is need to reduce the uncertainties in design through: Hydrodynamic models for critical design loads Procedures accounting for irregular loads on soil Large research project from RCN: WAS-XL Total budget of 22 MNOK Partners: Sintef Ocean, NGI, NTNU 4 year duration Project start in 2018 Hs, m
33 Loads on offshore wind turbines and effect of irregular cyclic loading 80 0 h τ (kpa) Time (s) 0 τ h (kpa) Time (s)
34 Frontier and challenges Streamlined design flow for large number of turbine locations A wind farm consists of many turbines. Variations in soil layering, strengths, water depth, wind speed etc. Site specific design is typically required For efficient design, this requires a streamlined design flow and interpolation and extrapolation of ground conditions and soil reaction models (e.g. p-y springs)
35 Frontier and challenges Intelligent ground model and artificial intelligence Advanced ground models combining geophysical and geotechnical data are already in existence Such ground models allow for interpolation and extrapolations of soil conditions across a large area The ground model can be continuously updated with additional data from field and laboratory investigations One step further to combine Metocean data Load calculation models Foundation design tools Which allows for: Preliminary foundation sizing based on chosen foundation concept Continuously updating through the different phases of the project Ground model with CPT data
36 Frontier and challenges Reliability based design A wind turbine is a complex system and the design is an outcome of: Turbine structure Ocean environment Soil conditions Aero, hydro, structural, geotechnical analysis models A reliability assessment of each modelling components Study the sensitivity of design outcome to the various components and identify factors that require most efforts for optimised design.
37 Frontier and challenges Long term deformations of offshore wind turbine foundations Life time deformation for OWT foundations OWT foundations subjected to millions of cycles of loading during the design life Accumulated deformation during the design life of OWT should be estimated Robust calculation method is to be developed. In soft seabed, consolidation settlement, in particular uneven settlement, need to be considered and assessed.
38 Frontier and challenges Specific challenges in China General very soft ground conditions, soft clay, silt, silty clay, silty sand Perhaps some catch-up to be made on the site investigation practice? Relatively limited experience in the soil properties under cyclic loading? Long term settlement Seismic and liquefiable soil conditions Frequent typhoon events Suction assisted installation in silty soils Scour around foundations
39 Opportunities for collaboration between NGI-China Every year, NGI have many small GBV projects, perfect platforms for initiating collaboration EU projects: NGI can apply for EU research funding, co-funding mechanism available from National Science Foundation China (NSFC) China-Norway funding possibilities: in 2018, Research Council of Norway and NSFC announced NOK 80 million joint funding for China- Norway NGI hosts CSC PhD and academic fellows with relevant background NGI carry out numerous industry sponsored research
40 Thank you for your attention!
41 NORWEGIAN GEOTECHNICAL INSTITUTE NGI.NO #onsafeground
FOUNDATION ISSUES: OFFSHORE WIND FARMS Indian Context
FOUNDATION ISSUES: OFFSHORE WIND FARMS Indian Context R.K. Ghanekar, Head - Geotechnical Section, INSTITUTE OF ENGINEERING AND OCEAN TECHNOLOGY (IEOT), ONGC, PANVEL, NAVI MUMBAI OFFSHORE WIND ENERGY IN
More informationEffect of Pile Bending Stiffness on Static Lateral Behavior of a Short Monopile in Dry Sand
INTERNATIONAL JOURNAL OF COASTAL & OFFSHORE ENGINEERING JCOE No. 5/ Winter 217 (25-32) Effect of Pile Bending Stiffness on Static Lateral Behavior of a Short Monopile in Dry Sand Saeed Darvishi Alamouti
More informationOptimum Geometry of Monopiles With Respect to the Geotechnical Design
Journal of Ocean and Wind Energy (ISSN 2310-3604) Copyright by The International Society of Offshore and Polar Engineers Vol. 2, No. 1, February 2015, pp. 54 60 http://www.isope.org/publications Optimum
More informationSImulation of MONopile installation - JIP SIMON
SImulation of MONopile installation - JIP SIMON Ahmed Elkadi Deltares 14 February 2019 MOTIVATION Vanbeekimages.com 14 februari 2019 Matchmaking Day 2019 2 Global substructure statistics/trends 2016 Offshore
More informationCentrifuge modelling of monopiles in dense sand at The Technical University of Denmark
Centrifuge modelling of monopiles in dense sand at The Technical University of Denmark R. T. Klinkvort, C. T. Leth & O. Hededal Technical University of Denmark, Department of Civil engineering Abstract:
More informationVIBRATIONAL TESTING OF A FULL-SCALE PILE GROUP IN SOFT CLAY
VIBRATIONAL TESTING OF A FULL-SCALE PILE GROUP IN SOFT CLAY Marvin W HALLING 1, Kevin C WOMACK 2, Ikhsan MUHAMMAD 3 And Kyle M ROLLINS 4 SUMMARY A 3 x 3 pile group and pile cap were constructed in a soft
More informationINFLUENCE OF PILES ON LOAD- SETTLEMENT BEHAVIOUR OF RAFT FOUNDATION
INFLUENCE OF PILES ON LOAD- SETTLEMENT BEHAVIOUR OF RAFT FOUNDATION BALESHWAR SINGH Department of Civil Engineering Indian Institute of Technology Guwahati Guwahati 78139, India NINGOMBAM THOIBA SINGH
More informationMonopile as Part of Aeroelastic Wind Turbine Simulation Code
Monopile as Part of Aeroelastic Wind Turbine Simulation Code Rune Rubak and Jørgen Thirstrup Petersen Siemens Wind Power A/S Borupvej 16 DK-7330 Brande Denmark Abstract The influence on wind turbine design
More informationDimension Effect on P-y Model Used for Design of Laterally Loaded Piles
Procedia Engineering Volume 143, 2016, Pages 598 606 Advances in Transportation Geotechnics 3. The 3rd International Conference on Transportation Geotechnics (ICTG 2016) Dimension Effect on P-y Model Used
More informationSensitivity Analysis of Limited Actuation for Real-time Hybrid Model Testing of 5MW and 10MW Monopile Offshore Wind Turbines
Sensitivity Analysis of Limited Actuation for Real-time Hybrid Model Testing of 5MW and 10MW Monopile Offshore Wind Turbines Karimirad, M., & Bachynski, E. E. (2017). Sensitivity Analysis of Limited Actuation
More informationThe UCD community has made this article openly available. Please share how this access benefits you. Your story matters!
Provided by the author(s) and University College Dublin Library in accordance with publisher policies., Please cite the published version when available. Title Design Tools Available For Monopile Engineering
More informationTESTING EQUIPMENT SHEAR STRENGTH PARAMETERS SOIL. established in 1972
SOIL www.alfatestusa.com established in 1972 SOIL Used to perform large range of Triaxial tests on soil samples to determine the strength parameters and the mechanical properties. Capable of performing:
More information3. Existing uncertainties
Fig. 1. Cumulative and annual offshore wind installations [1]. sector, some uncertainties have not been identified yet; these will be discussed in the paper with the aim of achieving an adequate and sustainable
More informationSeabed and wind farm interaction. A Research Program. B. Mutlu Sumer DTU Mekanik
Seabed and wind farm interaction. A Research Program B. Mutlu Sumer DTU Mekanik Will tell you about a current research program on Interaction between seabed and offshore wind farms Start off with A small
More informationK L Rakshith, Smitha, International Journal of Advance Research, Ideas and Innovations in Technology.
ISSN: 2454-132X Impact factor: 4.295 (Volume3, Issue4) Available online at www.ijariit.com Effect of Bracings on Multistored RCC Frame Structure under Dynamic Loading Rakshith K L Department of Civil Engineering
More informationNumerical Modeling of Offshore Support Structures and Approaches in Validation of Simulation Tools
Numerical Modeling of Offshore Support Structures and Approaches in Validation of Simulation Tools Martin Kohlmeier, Wojciech Popko, Philipp Thomas Fraunhofer Institute for Wind Energy and Energy System
More informationFinite Element Study of Using Concrete Tie Beams to Reduce Differential Settlement Between Footings
Finite Element Study of Using Concrete Tie Beams to Reduce Differential Settlement Between Footings AMIN H. ALMASRI* AND ZIAD N. TAQIEDDIN** *Assistant Professor, Department of Civil Engineering, Jordan
More informationFree-Spanning Pipelines in the Digital Age Nicholas Nielsen & Olivier Royet
Free-Spanning Pipelines in the Digital Age Nicholas Nielsen & Olivier Royet 1 SAFER, SMARTER, GREENER 1 2 3 4 Context What are free spans? Current approach How do we estimate fatigue life? New science
More informationOn the design of monopile foundations with respect to static and quasi-static cyclic loading
Copenhagen Offshore Wind 2005 Prof. Dr. Martin Achmus, Dr. Khalid Abdel-Rahman, M. Sc. Proserpine Peralta University of Hannover Institute of Soil Mechanics, Foundation Engineering and Waterpower Engineering
More informationComparison of the Behavior for Free Standing Pile Group and Piles of Piled Raft
Engineering and Technology Journal Vol. 36, Part A, No.4, 218 DOI: http://dx.doi.org/1.3684/etj.36.4a.3 Awf A. Al-Kaisi Building & Const. Eng. Dept. University of Technology, Baghdad, Iraq Comparison of
More informationModule 5 : Design of Deep Foundations. Lecture 20 : Introduction [ Section 20.1 : Introduction ]
Lecture 20 : Introduction [ Section 20.1 : Introduction ] Objectives In this section you will learn the following Introduction Lecture 20 : Introduction [ Section 20.1 : Introduction ] INTRODUCTION The
More informationIHO Presentation Offshore Renewables
IHO Presentation Offshore Renewables Don Ventura 22nd November 2012 Fugro s Resources in Renewables Fugro: Consults Geophysical Data Measures Samples Interprets Integrates Geotechnical Data Environmental
More informationEffect of Tie Beam Dimensions on Vertical and Horizontal Displacement of Isolated Footing
http:// Effect of Tie Beam Dimensions on Vertical and Horizontal Displacement of Isolated Footing El-samny, M.K. (1), Ezz-Eldeen, H.A. (1), Elbatal, S.A. (1) and Kamar,A.M. (2) (1) Al-Azhar University,
More informationPh.D. Preliminary Qualifying Examination. Cover Page. Thermodynamic. January 17, 2013 (Thursday) 9:30 am 12:30 noon Room 2145 Engineering Building
GENERAL INSTRUCTIONS: COLLEGE OF ENGINEERING MECHANICAL ENGINEERING Ph.D. Preliminary Qualifying Examination Cover Page Thermodynamic January 17, 2013 (Thursday) 9:30 am 12:30 noon Room 2145 Engineering
More informationStudy on embedded length of piles for slope reinforced with one row of piles
Journal of Rock Mechanics and Geotechnical Engineering. 11, 3 (2): 7 17 Study on embedded length of piles for slope reinforced with one row of piles Shikou Yang, Xuhua Ren, Jixun Zhang College of Water
More informationNALYSIS OF STABILIZING SLOPES USING VERTICAL PILES
NALYSIS OF STABILIZING SLOPES USING VERTICAL PILES Mahmoud S. Abdelbaki: Lecturer, Gehan E. Abdelrahman: Lecturer, Youssef G. Youssef :Assis.Lecturer, Civil Eng. Dep., Faculty of Eng., Cairo University,
More informationNumerical Analysis of Piled Raft Foundation using Fem with Interaction Effects
International Journal of TechnoChem Research ISSN:2395-4248 www.technochemsai.com Vol.01, No.03, pp 126-134, 2015 Numerical Analysis of Piled Raft Foundation using Fem with Interaction Effects Naveen kumar.d
More informationThis document is a preview generated by EVS
INTERNATIONAL STANDARD ISO 19901-4 Second edition 2016-07-15 Petroleum and natural gas industries Specific requirements for offshore structures Part 4: Geotechnical and foundation design considerations
More informationDeepwater design challenges
Phillip Cooper, INTECSEA, UK, shows us how advanced numerical simulations are unravelling deepwater design challenges. Deepwater design challenges As oil and gas developments move into extreme water depths
More informationTitle. Author(s) P. WULANDARI. Issue Date Doc URLhttp://hdl.handle.net/2115/ Type. Note. File Information AND ANALYTICAL METHODS
Title ANALYSIS OF PILED RAFT FOUNDATIONS IN CLAYEY S AND ANALYTICAL METHODS Author(s) P. WULANDARI Issue Date 2013-09-11 Doc URLhttp://hdl.handle.net/2115/54231 Type proceedings Note The Thirteenth East
More informationAdvancement simulation of parallel tunnels and their interchange with two other subway lines using a new FEM approach, a case study
Geotechnics for Sustainable Development - Geotec Hanoi 0, Phung (edt). Construction Publisher. ISBN 978-60-8-00-8 Advancement simulation of parallel tunnels and their interchange with two other subway
More informationDesign and fatigue analysis of monopile foundations to support the DTU 10 MW offshore wind turbine
Available online at www.sciencedirect.com ScienceDirect Energy Procedia 137 (217) 3 13 www.elsevier.com/locate/procedia 14th Deep Sea Offshore Wind R&D Conference, EERA DeepWind 217, 18-2 January 217,
More informationExperimental Study on Pile Groups Settlement and Efficiency in Cohesionless Soil
Experimental Study on Pile Groups Settlement and Efficiency in Cohesionless Soil Elsamny, M.K. 1, Ibrahim, M.A. 2, Gad S.A. 3 and Abd-Mageed, M.F. 4 1, 2, 3 & 4- Civil Engineering Department Faculty of
More informationAvailable online at ScienceDirect. Procedia Engineering 114 (2015 )
Available online at www.sciencedirect.com ScienceDirect Procedia Engineering 114 (2015 ) 385 392 1st International Conference on Structural Integrity Faceted monopile design suitable for mass production
More informationOptimization of jacket design for large wind turbines. Mathias Stolpe & Kasper Sandal Wind Turbine Structures and Component Design
Optimization of jacket design for large wind turbines Mathias Stolpe & Kasper Sandal Wind Turbine Structures and Component Design We present a software which can bring advanced mathematics to practical
More informationUNIVERSITY OF HANNOVER Institute of Soil Mechanics, Foundation Engineering and Waterpower Engineering Prof. Dr.-Ing. Martin Achmus
UNIVERSITY OF ANNOVER Institute of Soil Mechanics, Foundation Engineering and Waterpower Engineering Prof. Dr.-Ing. Martin Achmus ON TE DESIGN OF MONOPILE FOUNDATIONS WIT RESPECT TO STATIC AND QUASI-STATIC
More informationINTERNATIONAL JOURNAL OF GEOMATICS AND GEOSCIENCES Volume 5, No 2, 2014
INTERNATIONAL JOURNAL OF GEOMATICS AND GEOSCIENCES Volume 5, No 2, 204 Copyright by the authors - Licensee IPA- Under Creative Commons license 3.0 Research article ISSN 0976 4380 An experimental investigation
More informationFIXED OFFSHORE WIND STRUCTURE DESIGN
WHITEPAPER FIXED OFFSHORE WIND STRUCTURE DESIGN What Sesam can do for fixed offshore wind turbine structure design and analysis SAFER, SMARTER, GREENER Reference to part of this report which may lead to
More informationUse of Soil Nails to Upgrade Loose Fill Slopes
Use of Soil Nails to Upgrade Loose Fill Slopes Professor John Endicott Dr Johnny Cheuk January 4, 2010 Acknowledgements GEO/S&T Ir Ken Ho Ir Anthony Lam Ir Patty Cheng Ir Thomas Hui GEO/LPM1 Ir W.K. Pun
More informationOffshore Energy Structures
Offshore Energy Structures Madjid Karimirad Offshore Energy Structures For Wind Power, Wave Energy and Hybrid Marine Platforms 1 3 ISBN 978-3-319-12174-1 ISBN 978-3-319-12175-8 (ebook) DOI 10.1007/978-3-319-12175-8
More informationManual. Pile Design [NEN method]
Manual Pile Design [NEN method] The information contained in this document is subject to modification without prior notice. No part of this document may be reproduced, transmitted or stored in a data retrieval
More informationABSTRACT INTRODUCTION. Immediate Displacement of the Seabed During Subsea Rock Installation (SRI) 3
Immediate Displacement of the Seabed During Subsea Rock Installation (SRI) 3 RENÉ VISSER AND JOOP VAN DER MEER IMMEDIATE DISPLACEMENT OF THE SEABED DURING SUBSEA ROCK INSTALLATION (SRI) ABSTRACT The integrity
More informationAnalysis of lifting operation of a monopile for an offshore wind turbine. considering vessel shielding effects
Analysis of lifting operation of a monopile for an offshore wind turbine considering vessel shielding effects Lin Li 1,2, Zhen Gao 1,2, Torgeir Moan 1,2 and Harald Ormberg 3 1 Centre for Ships and Ocean
More informationDEEP FOUNDATIONS PILES
DEEP FOUNDATIONS PILES Pile foundation used to support structure when poor quality soil bearing capacity failure excessive settlement piles END BEARING PILES SKIN FRICTION PILES End bearing pile rests
More informationCyclic Response of Dowel Connections in Precast Structures
Cyclic Response of Dowel Connections in Precast Structures M. Fischinger, B. Zoubek, M. Kramar, T. Isaković University of Ljubljana, Faculty of Civil and Geodetic Engineering, Slovenia SUMMARY: Precast
More informationSoil Structure Interactions for Offshore Wind Turbines
Reference Article 1st published in Month 2017 ISSN 2056-4007 www.ietdl.org Soil Structure Interactions for Offshore Wind Turbines Subhamoy Bhattacharya Chair in Geomechanics, Department of Civil and Environmental
More informationDesign of monopiles for multi-megawatt wind turbines at 50 m water depth
Downloaded from orbit.dtu.dk on: Aug 31, 2018 Design of monopiles for multi-megawatt wind turbines at 50 m water depth NJOMO WANDJI, Wilfried; Natarajan, Anand; Dimitrov, Nikolay Krasimirov; Buhl, Thomas
More informationWind Turbine Decommissioning in the UK Offshore Zone
Wind Turbine Decommissioning in the UK Offshore Zone BWEA - Annual Conference 2001 Presented by Dan Pearson Presentation Introduction: Why this topic? Life Cycle of an Offshore Wind Turbine Decommissioning
More informationInto Deepwater and Back Again: New Challenges for Current Profile Characterisation
Into Deepwater and Back Again: New Challenges for Current Profile Characterisation Dr Gus Jeans Oceanalysis Ltd Into Deepwater and Back Again New Challenges for Current Profile Characterisation A key input
More informationASHES: A Novel Tool for FEM analysis of Wind Turbines with innovative visualization techniques. Statkraft Ocean Energy Research Program
ASHES: A Novel Tool for FEM analysis of Wind Turbines with innovative visualization techniques Content: 1. Introduction: Status for aeroelastic software 2. ASHES: 1. What? 2. Why? 3. Benchmarking (OC4,
More informationPrying of a Large Span Base Plate Undergoing a Moment Load Applied by a Round Pier
Prying of a Large Span Base Plate Undergoing a Moment Load Applied by a Round Pier by Anastasia Wickeler A thesis submitted in conformity with the requirements for the degree of Masters of Applied Science
More informationCentre for Autonomous Marine Operations and Systems
2013-2022 Centre for Autonomous Marine Operations and Systems AMOS CoE - Centre of Excellence Norwegian University of Science and Technology (NTNU) 11 th April 2014 SMI Seminar: Automation and Autonomy
More informationTIE BEAMS RESTING ON REPLACED SOIL. 1 and 2 Civil Engineering department Faculty of Engineering, Al Azhar University Cairo, Egypt IJSER
1 STRAINING ACTIONS OF FOOTINGS CONNECTED WITH TIE BEAMS RESTING ON REPLACED SOIL Elbatal, S.A.1 & Abo-Alanwar, M.M.2 1 and 2 Civil Engineering department Faculty of Engineering, Al Azhar University Cairo,
More informationNumerical Modeling of Grouted Soil Nails
Numerical Modeling of Grouted Soil Nails Dr. Haider S. Al -Jubair Department of Civil Engineering University of Basrah-College of Engineering Basrah, Iraq Afaf A. Maki Department of Civil Engineering University
More informationPelastar TLP Floating Wind Turbine Foundation
Pelastar TLP Floating Wind Turbine Foundation William Hurley Glosten Associates 2017 Energy Technologies Institute LLP - Subject to notes on page 1 PRESENTED AT TEN YEARS OF INNOVATION THE ETI AND THE
More informationMonopile Head Stiffness and Natural Frequency Assessment of Some Installed OWTs using a Pseudo 3D Nonlinear FE Model. *Djillali Amar-Bouzid 1)
Monopile Head Stiffness and Natural Frequency Assessment of Some Installed OWTs using a Pseudo 3D Nonlinear FE Model *Djillali Amar-Bouzid 1) 1) Department of Civil Engineering, Faculty of Technology,
More informationANALYSIS OF LATERALLY LOADED PILE GROUPS
IOSR Journal of Civil Engineering (IOSR-JMCE) ISSN: 2278-0661, ISBN: 2278-8727, PP: 60-64 www.iosrjournals.org ANALYSIS OF LATERALLY LOADED PILE GROUPS B. Manjula Devi 1, Chore H.S 1, V.A.Sawant 2 1, Department
More informationOMAE A SYSTEMATIC DESIGN APPROACH OF GRIPPER S HYDRAULIC SYSTEM UTILIZED IN OFFSHORE WIND TURBINE MONOPILE INSTALLATION
Proceedings of the ASME 2018 37th International Conference on Ocean, Offshore and Arctic Engineering OMAE2018 June 17-22, 2018, Madrid, Spain OMAE2018-77228 A SYSTEMATIC DESIGN APPROACH OF GRIPPER S HYDRAULIC
More informationFloating installation of offshore wind turbine foundations
1 b Floating installation of offshore wind turbine foundations An Engineering Assessment on Ship Monopile Interaction during Pile Driving L.G. Buitendijk, TU Delft, The Netherlands - December 2016 THESIS
More informationREVIEW ON MONOPILE FOUNDATION FOR FIXED OFFSHORE STRUCTURE
REVIEW ON MONOPILE FOUNDATION FOR FIXED OFFSHORE STRUCTURE Zimri 1, Freeda Christy C 2 1. Zimri is currently pursuing master s degree program m civil engineering in School of Civil Engineering, Karunya
More informationEFFECTS OF ACCELEROMETER MOUNTING METHODS ON QUALITY OF MEASURED FRF S
The 21 st International Congress on Sound and Vibration 13-17 July, 2014, Beijing/China EFFECTS OF ACCELEROMETER MOUNTING METHODS ON QUALITY OF MEASURED FRF S Shokrollahi Saeed, Adel Farhad Space Research
More informationSecondary Consolidation (Creep)
Secondary Consolidation Tutorial 11-1 Secondary Consolidation (Creep) When a load is applied to a low permeability soil (clay), you will see a period of primary consolidation as excess pore pressures dissipate.
More informationSliding shear capacities of the Asymmetric Friction Connection
Sliding shear capacities of the Asymmetric Friction Connection S. Yeung, H. Zhou, H.H. Khoo & G.C. Clifton Department of Civil Engineering, University of Auckland, Auckland. G.A. MacRae University of Canterbury,
More informationAvailable online at ScienceDirect. Procedia Engineering 125 (2015 )
Available online at www.sciencedirect.com ScienceDirect Procedia Engineering 125 (2015 ) 363 367 The 5th International Conference of Euro Asia Civil Engineering Forum (EACEF-5) Analysis of piled raft foundation
More informationInstruction Manual for installing
Instruction Manual for installing Preloaded (HSFG) Bolting with TurnaSure DIRECT TENSION INDICATORS CE Marked EN 14399-9 TurnaSure LLC TABLE OF CONTENTS Introduction... 1 Theory of Preloaded Bolting Assemblies...
More informationPiles Capacity Reference Manual
Piles Capacity Reference Manual hetge hetge geotechnics on the go Piles Capacity Reference Manual May 22, 2012 Version: PC-1.2.120728b hetge LLC Moscow Virginia Istanbul E info@hetge.com W www.hetge.com
More informationLoad application in load cells - Tips for users
Load application in load cells - Tips for users Correct load application on the load cells is a prerequisite for precise weighing results. Be it load direction, support structure or mounting aids load
More informationPerformance of Piled Raft Foundation on Sand Bed
Performance of Piled Raft Foundation on Sand Bed Prof. S. W. Thakare 1, Pankaj Dhawale 2 Associate Professor, Department of Civil Engineering, Government College of Engineering, Amravati, India 1 P.G.
More informationParametric Study on Piled Raft Foundation in Sand Using Numerical Modelling
Parametric Study on Piled Raft Foundation in Using Numerical Modelling Author Oh, Erwin, Bui, Quan-Minh, Surarak, Chanaton, Adamec, Richard, Balasubramaniam, Bala Published 28 Conference Title Futures
More information5.1 Optimal integrated combination of foundation concept and installation method
WE@SEA 5.1 Optimal integrated combination of foundation concept and installation method Results of We@Sea research in perspective December 1 2, Den Helder, The Netherlands Goal and Partners The project
More informationSTRUCTURAL TIMBER DESIGN
STRUCTURAL TIMBER DESIGN to Eurocode 5 2nd Edition Jack Porteous BSc, MSc, DIC, PhD, CEng, MIStructE, FICE Director lack Porteous Consultancy and Abdy Kernlani BSc, MSc, PhD, CEng, FIStructE, FIWSc Professor
More informationDynamic Analysis of Infills on R.C Framed Structures
Dynamic Analysis of Infills on R.C Framed Structures Manju G 1 P.G. Student, Department of Civil Engineering, Sahyadri College of Engineering and Management, Mangalore, Karnataka, India 1 ABSTRACT: While
More informationTEST SERIES TO EVALUATE THE STRUCTURAL BEHAVIOUR OF ISOBOARD OVER RAFTER SYSTEM
TEST SERIES TO EVALUATE THE STRUCTURAL BEHAVIOUR OF ISOBOARD OVER RAFTER SYSTEM J A Wium Institute of Structural Engineering 19 November 2007 ISI2007-3 TEST SERIES TO EVALUATE THE STRUCTURAL BEHAVIOUR
More informationParametric Study on Dynamic Tension Behaviour of Offshore Pipeline for Deepwater S-lay Operation
Parametric Study on Dynamic Tension Behaviour of Offshore Pipeline for Deepwater S-lay Operation Pu XU 1, Shun Feng GONG, Ting ZHANG 1, Cheng CHEN 1 1 College of Civil Engineering, Fuzhou University, Fuzhou
More informationIDEA Connection New CBFEM design of steel joints
IDEA Connection New CBFEM design of steel joints Lubos Sabatka Erlenbach, September 02, 2014 ingware.ch Mit dem Besten rechnen 3 Range of steel joints 4 Range of steel joints 5 TA CR project - preparations
More informationEFFECT OF SETBACK RATIO ON SEISMIC PERFORMANCE OF RC STRUCTURES
International Research Journal of Engineering and Technology (IRJET) e-issn: - EFFECT OF SETBACK RATIO ON SEISMIC PERFORMANCE OF RC STRUCTURES Shambhavi B. Hiremath, M.E. Raghu and Dr. G. Chidananda Student,
More informationFinite Element Analysis per ASME B31.3
Brief Discussion: Split-Body 12in Butterfly valve, Ph: 520-265-3657 Page 1 of 13 Finite Element Analysis per ASME B31.3 Prepared by: Michael Rodgers, P.Eng. Date: July 16, 2010 Page 2 of 13 Section Headings:
More informationFriction Grip in Wellheads: An Innovative Approach to Load Support & Sealing
Friction Grip in Wellheads: An Innovative Approach to Load Support & Sealing Brent Harrald Principal Engineer Plexus Ocean Systems Ltd. December 2009 Page 1 Table of Contents Introduction Plexus Ocean
More informationSKIN FRICTION OF PILES COATED WITH BITUMINOUS COATS Makarand G. Khare 1 and Shailesh R. Gandhi 2
SKIN FRICTION OF PILES COATED WITH BITUMINOUS COATS Makarand G. Khare 1 and Shailesh R. Gandhi 2 1 Ph.D Student, Dept. of Civil Engineering, Indian Institute of Tech. Madras, Chennai, India-600036 Email:
More informationJørn Scharling Holm DONG Energy
Jørn Scharling Holm DONG Energy 3 rd June 2016 Offshore BoP - Sub-topics and timelines Delivery by Delivery by Table Priority Table 2020-2025 Table 2025-2030 Delivery post 2030 Industrialized transport
More informationProf. Sudhir Misra, Dept of CE (PI) Prof. Samit Raychaudhari, Dept of CE (Co PI) Dr. KK Bajpai, Dept of CE (Co PI)
Development of draft protocol for testing of structural components and systems for use in schemes under Housing for all project of the Government of India Prof. Sudhir Misra, Dept of CE (PI) Prof. Samit
More informationInvestigation of the Behavior of Piled Raft Foundations in Sand by Numerical Modeling
Investigation of the Behavior of Piled Raft Foundations in Sand by Numerical Modeling Author Oh, Erwin, Bui, Quan-Minh, Surarak, Chanaton, Balasubramaniam, Bala Published 29 Conference Title Proceedings
More informationHeat-Mechanics Interaction Behavior of Laminated Rubber Bearings under Large and Cyclic Lateral Deformation
October 2-7, 28, Beijing, China Heat-Mechanics Interaction Behavior of Laminated Rubber Bearings under Large and Cyclic Lateral Deformation E. Takaoka, Y. Takenaka 2, A. Kondo 3, M. Hikita 4 H. Kitamura
More informationInstruction Manual for installing
Instruction Manual for installing Preloaded (HSFG) Bolting with TurnaSure DIRECT TENSION INDICATORS TurnaSure LLC TABLE OF CONTENTS Introduction... 1 Theory of Preloaded Bolting Assemblies... 2 Tightening
More informationThe future of offshore wind in the US
The future of offshore wind in the US One of these things is not like the other Why is the adoption of the European Model not the best path forwards for the US offshore wind market? Arup specialists explore
More informationNOWITECH Innovations in offshore wind energy
NOWITECH Innovations in offshore wind energy January 2016 www.nowitech.no John Olav Giæver Tande Director NOWITECH Senior Scientist / Research Manager SINTEF Energy Research John.tande@sintef.no 1 NOWITECH
More information3D Non-Linear FEA to Determine Burst and Collapse Capacity of Eccentrically Worn Casing
3D Non-Linear FEA to Determine Burst and Collapse Capacity of Eccentrically Worn Casing Mark Haning Asst. Prof James Doherty Civil and Resource Engineering, University of Western Australia Andrew House
More informationMechanical vibration Rotor balancing. Part 31: Susceptibility and sensitivity of machines to unbalance
Provläsningsexemplar / Preview INTERNATIONAL STANDARD ISO 21940-31 First edition 2013-08-15 Mechanical vibration Rotor balancing Part 31: Susceptibility and sensitivity of machines to unbalance Vibrations
More informationSeismic Performance of Brick Infill in RCC Structure
Seismic Performance of Brick Infill in RCC Structure Ms. Vaishnavi Battul, Mr. Rohit M. Shinde, Mr. Shivkumar Hallale, Ms. Tejashree Gulve Dr. D. Y. Patil Institute of Engineering, Management and Research,
More informationSixth Cycle Celebration of His Majesty the King of Thailand and 40 th Anniversary of the Asian Institute of Technology
Under the Royal Patronage of His Majesty King Bhumibol Adulyadej Sixth Cycle Celebration of His Majesty the King of Thailand and 40 th Anniversary of the Asian Institute of Technology Civil and Environmental
More informationResearch on Deformation of Soil Nailing Structure with Flexible Facing
2017 International Conference on Transportation Infrastructure and Materials (ICTIM 2017) ISBN: 978-1-60595-442-4 Research on Deformation of Soil Nailing Structure with Flexible Facing Tao Sun 1, Yanfeng
More informationClosing the Collaboration Gap
Closing the Collaboration Gap Technology for Improved Offshore Piping and Structural Analysis Projects Bilal Shah MSc Structural Engineering (Hons) Software Development Manager, Piping Mark Upston B Mechanical
More informationKistler portable triaxial Force Plate
Kistler portable triaxial Force Plate 1 Transducers Transducer - any device that converts one form of energy into another Sensors convert physical quantities into electrical signals electrical signals
More informationANSYS Offshore Products 14.0 Update
ANSYS Offshore Products 14.0 Update 1 Paul Schofield paul.schofield@ansys.com +1 281-676-7001 ANSYS Products for Offshore - 14.0 Update Introduction What are the ANSYS Products for Offshore? Historical
More informationANALYSIS OF PILE-RAFT FOUNDATIONS NON- RESTED AND DIRECTLY RESTED ON SOIL
ANALYSIS OF PILE-RAFT FOUNDATIONS NON- RESTED AND DIRECTLY RESTED ON SOIL Elsamny M. Kassem1, Abd EL Samee W. Nashaat2 and Essa. Tasneem.A1 1 Civil Engineering Department, Al-Azhar University, Cairo, Egypt
More informationVibratory Feeder Bowl Analysis
The Journal of Undergraduate Research Volume 7 Journal of Undergraduate Research, Volume 7: 2009 Article 7 2009 Vibratory Feeder Bowl Analysis Chris Green South Dakota State University Jeff Kreul South
More informationANALYSIS OF LATERAL STIFFNESS FOR INFILLED FRAME WITH OPENING
ANALYSIS OF LATERAL STIFFNESS FOR INFILLED FRAME WITH OPENING A.S. KASNALE 1 & SANJAY JAMKAR 2 Professor in Civil Engineering Department, M.S. Bidve Engineering College, Latur, India Professor in Civil
More informationSOFT-SOFT, NOT HARD ENOUGH?
SOFT-SOFT, NOT HARD ENOUGH? J. van der Tempel Faculty of Civil Engineering and Geosciences Interfaculty Offshore Technology & Section Wind Energy Delft University of Technology Stevinweg, 68 CN Delft The
More informationConcept for Offshore Wind Turbine Foundation Monitoring
Concept for Offshore Wind Turbine Foundation Monitoring World of Technology & Science Wim Hendricx Utrecht, October 4-7 th, 2016 Siemens PLM/STS/LMS Engineering Introduction Classical Condition Monitoring
More informationA Centre of Research-based Innovation Bridging Industry and Science. Erling Kolltveit, Manager
A Centre of Research-based Innovation Bridging Industry and Science Erling Kolltveit, Manager erling@cmr.no Outline An overview of MIMT - a Centre of Research-based Innovation Vision Partners Technological
More information