09 - 11 July, 2019
Dorint City-Hotel Bremen, Germany

Conference day 2

Design challenges for foundation next-generations

7:30 am - 7:55 am Registration and welcome coffee

7:55 am - 8:00 am Chairperson's opening

Ricardo Rocha, Head Offshore Substructures at EDP Renováveis

Ricardo Rocha

Head Offshore Substructures
EDP Renováveis

8:00 am - 8:30 am Used of drilled and grouted foundations in WTG substructures

This presentation will cover some of the challenges associated with the use of this installation
technique. This technique, although well used in onshore applications, is relative novel for WTG
substructures.

Jorge Parra Rodriguez, Engineering Manager at Atkins

Jorge Parra Rodriguez

Engineering Manager
Atkins

8:30 am - 9:00 am Fatigue Resistance of Automatically Welded Tubular X-Joints for Jacket Support Structures

• Automatically welding procedure of tubular joints
• Test setup of axially fatigue tests
• Damage measurement using digital image correlation method
• New S-N curve for automatically welded tubular joints
Karsten Schürmann, Researcher at Leibniz University Hannover

Karsten Schürmann

Researcher
Leibniz University Hannover

9:00 am - 9:30 am Growing dimensions of monopiles

• Support structure design for the monopile foundation
• Impacts on fabrication
• Next-generation of monopiles

Michel Kurstjens, CCO at Sif Group

Michel Kurstjens

CCO
Sif Group

9:30 am - 10:00 am Design challenges and cost reduction solutions for large offshore wind turbine support structure in China

• Foundation design challenges due to complex site specific MetOcean and soil conditions in China
• Design approaches for foundation cost reduction
• Commercially competitive foundation solutions in the future
Rongfu Li, Team Leader Offshore Structure Design at Goldwind

Rongfu Li

Team Leader Offshore Structure Design
Goldwind

10:00 am - 10:30 am Refreshment break and networking

10:30 am - 11:00 am Gravity base foundation for next-generation turbines

• How can the industry respond to specific design challenges of larger turbines for all foundations
• How challenge within gravity bases in-particular can be met, the associated affects of such
design choices for a project during construction, and implications for the commercial aspects
such as project finance and insurers.
Matt Bleasdale, Director at Offshore Wind Logistics & Construction (OWLC)

Matt Bleasdale

Director
Offshore Wind Logistics & Construction (OWLC)

11:00 am - 11:30 am Application of modern High Strength Low Carbon steels in monopiles - perspectives and advantages

• Effects on monopile weight reduction
• The IIW-guideline on HFMI-treatment
• Benefits of niobium (Nb) microalloyed steels


Dr. Sigurd Weise, Project development at OWT

Dr. Sigurd Weise

Project development
OWT

Logistics impact on LCoE

11:30 am - 12:00 pm Integrated Project Logistics and Costs Calculation for Gravity Based Structures

The gravity based structure (GBS) is receiving renewed interest for its applicability for supporting
large turbines in deep water sites with challenging soil conditions. The transportation and
installation of these large foundations will increasingly be performed in rough sea conditions.
For three different GBS concepts simulations with the discrete event simulator ECN Install have
been performed. In this presentation, insight will be shared into the duration of the installation, and
the importance of different types of delays to installation costs.
Koen Hermans, Researcher Offshore Wind at TNO

Koen Hermans

Researcher Offshore Wind
TNO

Insights on current projects

12:00 pm - 12:30 pm How the implementation of advanced structural analyses integrated with PISA-type geotechnical analyses can realise significant project benefits and help reduce the Levelized Cost of Energy for offshore monopile foundations

A case study is presented which summarises the significant reduction in project risks and a welcomed reduction in levelized cost of energy (LCoE) realised for the Seastar and Mermaid offshore substation platform. This was achieved by adopting an integrated and collaborative workflow between structural and geotechnical focused designers, whereby each party implemented industry leading design analyses that can be employed for monopile foundations.

SLPE performed the detailed structural design using a combination of time domain and spectral dynamic analysis techniques and employed Fugro’s soil‑structure interaction analyses expertise to implement the recommendations from the Pile Soil Analysis (PISA) (Byrne et al., 2017) joint industry project for foundation design.  SLPE’s team developed a dynamic analysis tool capable of capturing ringing effects, due to high order wave loading, and modelling diffraction effects including directionality for appurtenances as well as p-δ effects and linear buckling. This comprehensive tool was used to compare DNVGL-type geotechnical modelling vs. advanced soil modelling reaction curves derived between SLPE and Fugro. Fugro performed 3D finite element analysis using proprietary soil (constitutive) models to develop site-specific soil reaction curves for detailed structural analysis according to PISA. Using such bespoke models is shown to reduce costs and schedules when compared with more standard codified approaches, significantly reducing the foundation-related risks associated with the project.





Scott Whyte, Geotechnical Consultant at Fugro

Scott Whyte

Geotechnical Consultant
Fugro

Joe Hilton, Engineering Manager at Sea and Land Project Engineering Limited

Joe Hilton

Engineering Manager
Sea and Land Project Engineering Limited

12:30 pm - 2:00 pm Networking lunch

• Background: Innovate-UK JIP (2014-2017) and PISA Project (2013-2018)
• Current Research: ALPACA Project (2017-2020) for piles in chalk
• Outcomes: Axial and lateral pile performance under monotonic and cyclic loading.

Dr. Róisín Buckley, Ørsted REMS CDT Departmental Lecturer in Geotechnical Engineering at University of Oxford

Dr. Róisín Buckley

Ørsted REMS CDT Departmental Lecturer in Geotechnical Engineering
University of Oxford

2:30 pm - 3:00 pm Synergies for optimisation of site investigation and pile design on an offshore wind farm

Overview of execution of North Sea offshore wind farm foundations focusing on the particular
benefits achieved by a close relationship between developer, survey contractor, designer and
consultants from planning to installation.
Luis Costa, Lead Geotechnical Engineer at ScottishPower Renewables

Luis Costa

Lead Geotechnical Engineer
ScottishPower Renewables

Table A | Extreme loads and fatigue
Table B | Corrosion fatigue
Table C | Structural health monitoring
Table D | Future of monitoring hardware
George Katsikogiannis, Research Associate at Norwegian University of Science  and Technology

George Katsikogiannis

Research Associate
Norwegian University of Science and Technology

Prof. Feargal Brennan, Professor of Offshore Engineering at University of Strathclyde

Prof. Feargal Brennan

Professor of Offshore Engineering
University of Strathclyde

Hans Jørgen Riber, Director R&D at LICengineering A/S

Hans Jørgen Riber

Director R&D
LICengineering A/S

Dr. Wout Weijtjens, Research and development engineer at OWI Lab

Dr. Wout Weijtjens

Research and development engineer
OWI Lab

Prof. Dr. Christof Devriendt, Scientific Research Coordinator at OWI-Lab

Prof. Dr. Christof Devriendt

Scientific Research Coordinator
OWI-Lab

3:45 pm - 4:15 pm Refreshment break and networking

4:15 pm - 4:45 pm Case Study: Re-assessment of non-conform executed transition piece welds

At the offshore wind park BARD Offshore 1 most of the transition pieces show weld flaws (lacunae)
of different extension, which was not intended. The first attempt of treating this non-conformity
was an yearly inspection of all affected TPs by conventional ultra-sonic testing (UT). As the result
of these UT inspection have not been satisfying combined with enormous costs, a re-assessment
has been undertaken to answer: How do non-conformities (NC) look like? How is the local
distribution of NC? Is crack propagation the relevant failure mechanism? Is the repair of the
affected welds avoidable? The program will be presented and the individual steps of the
assessment are discussed.

Dr. Kai Irschik, System Responsible, Project Certification at Ocean Breeze Energy GmbH

Dr. Kai Irschik

System Responsible, Project Certification
Ocean Breeze Energy GmbH

4:45 pm - 5:15 pm Improved buckling assessment – Pushing extreme capacity

• Improved capacity due to updates in Eurocode EN 1993-1-6
• Benefits of numerical buckling analysis
• Pitfalls and current developments
Dr.-Ing. Marc Seidel, Senior Key Expert Support Structures at Siemens Gamesa Renewable Energy

Dr.-Ing. Marc Seidel

Senior Key Expert Support Structures
Siemens Gamesa Renewable Energy

5:15 pm - 5:45 pm A comparison of monopile design in Taiwan and North Sea areas

• Structural design challenges
• Insights about the load and environmental conditions aspects
Frank Ostermann, Head of Loads and Structural Dynamics at J-B-O GmbH

Frank Ostermann

Head of Loads and Structural Dynamics
J-B-O GmbH

5:45 pm - 5:55 pm Closing remarks of conference chairperson

Ricardo Rocha, Head Offshore Substructures at EDP Renováveis

Ricardo Rocha

Head Offshore Substructures
EDP Renováveis

WORKSHOP A

6:30 pm - 8:30 pm Does floating foundations hold the future of offshore wind?

It is undeniable that floating foundations are a part of the offshore wind landscape. Could it be the transition we are looking for to decrease wind offshore LCoE? This open discussion will offer a chance to discuss opportunities, barriers, and innovations: current concepts to follow up, available mooring technologies, and impact on environment, installation and logistics… 
Dirk Pulles, Manager Renewables at KCI Engineers

Dirk Pulles

Manager Renewables
KCI Engineers