Workshop 2: Study of structural and foundation systems of Wind Turbines

27/9/2021-2/10/2021

The diversity of the subsoil from rock to soft ground (seabed) requires a variety of methods for the WT’s foundation and tower construction in order to make the installation environmentally friendly (drilling, ramming, shaking), to confine the noise emissions (underground and airbone noise) and to provide the lightning protection of the wind turbines. On the other hand installation and construction of WTs in Greece differs from that in Germany due to different Greek geomorphological soil conditions characterized by steeper slopes on land and water with foundations on predominantly soft rock or stiff soils and foundations in the offshore area lie in deeper water than the depths of the North German Bay or the Baltic Sea. Effects of soil structure interaction due to cyclic loading on foundations for offshore wind turbines is a serious problem for the installation of WTs, while the use of a foundation on floating platforms requires a careful study of utilized anchoring which, in the seabed is exposed to a cyclical load of wind and waves, as well as an underwater current.

The present workshop deals with methods and simulations that solve engineering problems faced in the installation of wind turbines. Lectures on the investigations of soil behavior using triaxial testing techniques, cyclic Loading of soils and simulation of accumulation Phenomena, numerical simulations of high cycle fatigue Loading on welded or bolded joints, acoustic and seismic measurements of low frequency emissions of onshore wind turbines,  simplified approaches for the estimation of the  dynamic  foundation-subsoil interaction of a wind turbine, advanced nonlinear structural analysis and design principles for floating platforms will be presented and discussed by experts teaching in Greece and Germany.

The workshop will be held place in the Engineering School of the University of Patras from 27/9/2021 to 2/10/2021.

Workshop Venue

School of Engineering of the University of Patras

Flyer

Teaching Team

Theodoros TriantafyllidisProfessor
Faculty of Civil Engineering, Geo- and Environmental Sciences, KIT, Germany.
Thomas UmmenhoferProfessor
Faculty of Civil Engineering, Geo- and Environmental Sciences, KIT, Germany.
Athanasios DimasProfessor
Department of Civil Engineering University of Patras, Greece.
George HatzigeorgiouProfessor
Hellenic Open University.
Panagiotis PelekisProfessor
Department of Civil Engineering University of Patras, Greece.
Eleftheria PyrgiotiProfessor
Department of Electrical & Computer Engineering, University of Patras, Greece.
Lukas KnittelDr. -Ing.
Faculty of Civil Engineering, Geo- and Environmental Sciences, KIT, Germany.
Merita TafiliDr. -Ing.
Ruhr University Bochum (RUB), Germany.
Stylianos ChrissopoulosDr. -Ing.
Technical University of Munich (TUB), Germany.
Ivo KimmigDr.-Ing.
Faculty of Civil Engineering, Geo- and Environmental Sciences, KIT, Germany.
Stefanos GkatzogiannisDr.-Ing.
Faculty of Civil Engineering, Geo & Environmental Sciences, KIT, Germany
Jan Machacek Dr.-Ing.
Faculty of Civil- and Environmental Engineering
Technical University of Darmstadt, Germany

Technical Program

9:00-9:30 Registration and welcome
9:30-10:00 Workshop opening by Prof. T. Triantafyllidis
10:00-11:10 Components of onshore  wind turbines

Prof. George Hatzigeorgiou

Introduction to offshore wind turbines (OWTs)

Prof. Athanasios Dimas
11:10-11:30 Break
11:30-12:30 Foundation Engineering for Wind turbines: Modelling, Analysis, Design and Soil-Structure Interaction

Prof. George Hatzigeorgiou
12:30-13:15 Advanced methods in modelling cumulative soil behavior   

Dr.-Ing. Merita Tafili

9:15-10:00 Site Investigations and Field Testing

Prof. Panagiotis Pelekis
10:15-11:00 Footing Design of Wind Turbines

Prof. Panagiotis Pelekis
11:00-11:30 Break
11:30-12:30 Lightning Protection as part of the foundation design

Prof. Eleftheria Pyrgioti
12:30-13:30 Installation of piles: Simulation strategies and influence on the long-term behavior under high-cycling loading   

Dr.-Ing. Jan Machacek and Prof. Theodoros Triantafyllidis

9:15-10:45 Elements of structural and fatigue analysis

Prof. George Hatzigeorgiou
11:00-11:45 Fatigue behavior of welded joints in offshore steal structures. Effect of high frequency peening methods and corrosion

Dr.-Ing. Stefanos Gkatzogiannis
11:45-12:00 Break
12:45-13:30 Increasing the fatigue strength of welded steel structures by high frequency mechanical impact treatment   

Dr.-Ing. Philipp Weidner

9:15-10:00 Cyclic Loading of soils and simulation of accumulation Phenomena

Prof. Theodoros Triantafyllidis
10:15-11:00 Investigations of soil behavior using triaxial testing techniques, Part 1   

Dr.-Ing. Lukas Knittel
11:00-11:30 Break
11:30-12:30 Investigations of soil behavior using triaxial testing techniques, Part 2

Dr.-Ing. Lukas Knittel
12:30-13:30 Numerical calculations of an offshore wind turbine based on high-cyclic triaxial tests   

Dr.-Ing. Lukas Knittel

9:15-10:15 Acoustic and seismic measurements of low frequency emissions of onshore wind turbines

Dr.-Ing. Ivo Kimming, Keller Grundbau
10:30-11:15 Development of a measuring system for a  dynamically stressed flat foundation

Dr.-Ing. Ivo Kimming, Keller Grundbau
11:15-11:30 Break
11:30-12:30 Numerical Simulation of low-frequency micro seismic and acοustic emissions of onshore turbines: Comparison with acoustic and seismic measurements

Dr.-Ing. Stylianos Chrisopoulos
12:30-13:30 Performance of different modelling aproaches for the simulation of pile driving process and for the estimation of the dynamic foundation-subsoil interaction of a wind turbine

Dr.-Ing. Stylianos Chrisopoulos

9:15-10:00 Advanced nonlinear structural analysis

Prof. George Hatzigeorgiou
10:15-11:00 Wind – generated waves

Prof. Athanasios Dimas
11:00-11:30 Break
11:30-12:30 Design principles for OWTs

Prof. Athanasios Dimas
12:30-13:30 Introduction to FAST

Prof. Athanasios Dimas

Registration

Registration is closed

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