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Delegates are invited to meet and discuss with the poster presenters in this topic directly after the session 'On- and off-shore installation technologies' taking place on Wednesday, 12 March 2014 at 11:15-12:45. The meet-the-authors will take place in the poster area.

Daeyong Lee RIST (Research Institute of Industrial Science and Technology), Korea, Republic of
Co-authors:
Daeyong Lee (1) F P Taeho Lee (2)
(1) RIST (Research Institute of Industrial Science and Technology), Incheon, Korea, Republic of (2) Seil Engineering, Seoul, Korea, Republic of

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Presenter's biography

Biographies are supplied directly by presenters at EWEA 2014 and are published here unedited

Daeyong Lee is Principal Research Engineer at RIST(Research Institute of Industrial Science and Technology), South Korea, where he does research on development of innovative steel structural systems. Dr. Lee received his Ph.D. from the University of Michigan (in 2001) and completed Post-Doctoral research at the University of Minnesota(in 2003), USA.

Abstract

Basic design of jacket substructures for the South-West Offshore Wind Farm project in Korea

Introduction

Four different offshore wind turbines (3.0MW, 5.0MW, 5.5MW, 7.0MW) are under development in Korea. These wind turbines will be installed and tested at the South-West Offshore Wind Farm project site within a few years. Recently, basic design of the substructures supporting the above four different offshore wind turbines has been conducted. Results of the basic design are explained in this paper.

Approach

Substructures for the offshore wind turbines not only support the upper part of the generation facility including blades, nacelle, and tower, but also transfer the environmental load (e.g., wind, wave, current) effects to the seabed. Considering geotechnical and ocean environmental conditions of the South-West Offshore Wind Farm project site, a jacket is selected as the most competitive substructure type in this project. This paper covers structural design of the jacket substructures and their installation method.

Main body of abstract

Four jacket substructures are designed for the four different offshore wind turbines (3.0MW, 5.0MW, 5.5MW, 7.0MW), which are under development in Korea. Transition pieces connecting towers and substructures are also designed in this basic design. In order to confirm safety of the substructures and transition pieces, dynamic characteristics, member stress level, maximum lateral displacement, geotechnical resistance, and pile driving is investigated in this project. Slop of the jacket leg is adjusted to avoid a resonance between the upper part and the lower part. Three different jacket brace layouts are considered in the structural designing part. Unfortunately, fatigue check has not been executed in this basic design.
Usually, jacket substructures can be installed by either pre-piling method or post-piling method. Considering ocean environmental condition of the South-West Offshore Wind Farm project site and previous experience of the Korean construction engineers, post-piling method is selected for the offshore installation of the designed jacket substructures. Combination of installation vessel and equipment is also considered in this basic design.


Conclusion

Four pairs of jacket substructures and transition pieces are designed for 3.0MW, 5.0MW, 5.5MW, 7.0MW offshore wind turbines which will be installed and tested at the South-West Offshore Wind Farm project site in Korea within a few years. Also considered in this basic design is combination of installation vessel and equipment for post-piling installation method. A very useful reference is made for assuring structural safety of the supporting structures and estimating total cost of the offshore wind construction.


Learning objectives
Designing of jacket substructures and transition pieces for the 3.0MW, 5.0MW, 5.5MW, 7.0MW offshore wind turbines which will be installed and tested at the South-West Offshore Wind Farm project site in Korea.
Understanding possible combination of installation vessel and equipment for the construction of the above basic design results.